Move swapout code into vm/vm_swapout.c.
There is no NO_SWAPPING #ifdef left in the code. Requested by: alc Reviewed by: alc, markj Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D12663
This commit is contained in:
parent
05877a8595
commit
ac04195ba6
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=324795
@ -4828,6 +4828,7 @@ vm/swap_pager.c standard
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vm/uma_core.c standard
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vm/uma_dbg.c standard
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vm/memguard.c optional DEBUG_MEMGUARD
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vm/vm_domain.c standard
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vm/vm_fault.c standard
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vm/vm_glue.c standard
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vm/vm_init.c standard
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@ -4842,7 +4843,8 @@ vm/vm_pager.c standard
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vm/vm_phys.c standard
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vm/vm_radix.c standard
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vm/vm_reserv.c standard
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vm/vm_domain.c standard
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vm/vm_swapout.c optional !NO_SWAPPING
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vm/vm_swapout_dummy.c optional NO_SWAPPING
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vm/vm_unix.c standard
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vm/vnode_pager.c standard
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xen/features.c optional xenhvm
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@ -38,6 +38,10 @@ struct kstack_cache_entry {
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extern struct kstack_cache_entry *kstack_cache;
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#ifndef KSTACK_MAX_PAGES
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#define KSTACK_MAX_PAGES 32
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#endif
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#endif
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@ -71,7 +71,6 @@ void kmem_init(vm_offset_t, vm_offset_t);
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void kmem_init_zero_region(void);
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void kmeminit(void);
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void swapout_procs(int);
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int kernacc(void *, int, int);
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int useracc(void *, int, int);
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int vm_fault(vm_map_t, vm_offset_t, vm_prot_t, int);
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501
sys/vm/vm_glue.c
501
sys/vm/vm_glue.c
@ -101,13 +101,6 @@ __FBSDID("$FreeBSD$");
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#include <machine/cpu.h>
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#ifndef NO_SWAPPING
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static int swapout(struct proc *);
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static void swapclear(struct proc *);
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static void vm_thread_swapin(struct thread *td);
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static void vm_thread_swapout(struct thread *td);
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#endif
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/*
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* MPSAFE
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*
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@ -308,10 +301,6 @@ SYSCTL_INT(_vm, OID_AUTO, kstack_cache_size, CTLFLAG_RW, &kstack_cache_size, 0,
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SYSCTL_INT(_vm, OID_AUTO, kstacks, CTLFLAG_RD, &kstacks, 0,
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"");
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#ifndef KSTACK_MAX_PAGES
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#define KSTACK_MAX_PAGES 32
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#endif
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/*
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* Create the kernel stack (including pcb for i386) for a new thread.
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* This routine directly affects the fork perf for a process and
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@ -527,79 +516,6 @@ intr_prof_stack_use(struct thread *td, struct trapframe *frame)
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}
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#endif /* KSTACK_USAGE_PROF */
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#ifndef NO_SWAPPING
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/*
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* Allow a thread's kernel stack to be paged out.
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*/
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static void
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vm_thread_swapout(struct thread *td)
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{
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vm_object_t ksobj;
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vm_page_t m;
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int i, pages;
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cpu_thread_swapout(td);
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pages = td->td_kstack_pages;
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ksobj = td->td_kstack_obj;
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pmap_qremove(td->td_kstack, pages);
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VM_OBJECT_WLOCK(ksobj);
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for (i = 0; i < pages; i++) {
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m = vm_page_lookup(ksobj, i);
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if (m == NULL)
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panic("vm_thread_swapout: kstack already missing?");
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vm_page_dirty(m);
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vm_page_lock(m);
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vm_page_unwire(m, PQ_INACTIVE);
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vm_page_unlock(m);
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}
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VM_OBJECT_WUNLOCK(ksobj);
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}
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/*
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* Bring the kernel stack for a specified thread back in.
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*/
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static void
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vm_thread_swapin(struct thread *td)
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{
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vm_object_t ksobj;
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vm_page_t ma[KSTACK_MAX_PAGES];
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int pages;
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pages = td->td_kstack_pages;
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ksobj = td->td_kstack_obj;
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VM_OBJECT_WLOCK(ksobj);
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(void)vm_page_grab_pages(ksobj, 0, VM_ALLOC_NORMAL | VM_ALLOC_WIRED, ma,
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pages);
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for (int i = 0; i < pages;) {
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int j, a, count, rv;
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vm_page_assert_xbusied(ma[i]);
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if (ma[i]->valid == VM_PAGE_BITS_ALL) {
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vm_page_xunbusy(ma[i]);
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i++;
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continue;
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}
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vm_object_pip_add(ksobj, 1);
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for (j = i + 1; j < pages; j++)
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if (ma[j]->valid == VM_PAGE_BITS_ALL)
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break;
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rv = vm_pager_has_page(ksobj, ma[i]->pindex, NULL, &a);
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KASSERT(rv == 1, ("%s: missing page %p", __func__, ma[i]));
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count = min(a + 1, j - i);
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rv = vm_pager_get_pages(ksobj, ma + i, count, NULL, NULL);
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KASSERT(rv == VM_PAGER_OK, ("%s: cannot get kstack for proc %d",
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__func__, td->td_proc->p_pid));
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vm_object_pip_wakeup(ksobj);
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for (j = i; j < i + count; j++)
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vm_page_xunbusy(ma[j]);
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i += count;
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}
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VM_OBJECT_WUNLOCK(ksobj);
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pmap_qenter(td->td_kstack, ma, pages);
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cpu_thread_swapin(td);
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}
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#endif /* !NO_SWAPPING */
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/*
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* Implement fork's actions on an address space.
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* Here we arrange for the address space to be copied or referenced,
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@ -672,426 +588,9 @@ vm_waitproc(p)
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vmspace_exitfree(p); /* and clean-out the vmspace */
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}
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void
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faultin(p)
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struct proc *p;
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{
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#ifdef NO_SWAPPING
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PROC_LOCK_ASSERT(p, MA_OWNED);
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if ((p->p_flag & P_INMEM) == 0)
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panic("faultin: proc swapped out with NO_SWAPPING!");
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#else /* !NO_SWAPPING */
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struct thread *td;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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/*
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* If another process is swapping in this process,
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* just wait until it finishes.
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*/
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if (p->p_flag & P_SWAPPINGIN) {
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while (p->p_flag & P_SWAPPINGIN)
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msleep(&p->p_flag, &p->p_mtx, PVM, "faultin", 0);
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return;
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}
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if ((p->p_flag & P_INMEM) == 0) {
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/*
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* Don't let another thread swap process p out while we are
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* busy swapping it in.
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*/
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++p->p_lock;
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p->p_flag |= P_SWAPPINGIN;
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PROC_UNLOCK(p);
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/*
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* We hold no lock here because the list of threads
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* can not change while all threads in the process are
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* swapped out.
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*/
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FOREACH_THREAD_IN_PROC(p, td)
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vm_thread_swapin(td);
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PROC_LOCK(p);
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swapclear(p);
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p->p_swtick = ticks;
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wakeup(&p->p_flag);
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/* Allow other threads to swap p out now. */
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--p->p_lock;
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}
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#endif /* NO_SWAPPING */
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}
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/*
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* This swapin algorithm attempts to swap-in processes only if there
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* is enough space for them. Of course, if a process waits for a long
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* time, it will be swapped in anyway.
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*/
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void
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swapper(void)
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{
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struct proc *p;
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struct thread *td;
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struct proc *pp;
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int slptime;
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int swtime;
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int ppri;
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int pri;
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loop:
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if (vm_page_count_min()) {
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VM_WAIT;
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goto loop;
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}
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pp = NULL;
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ppri = INT_MIN;
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sx_slock(&allproc_lock);
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FOREACH_PROC_IN_SYSTEM(p) {
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PROC_LOCK(p);
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if (p->p_state == PRS_NEW ||
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p->p_flag & (P_SWAPPINGOUT | P_SWAPPINGIN | P_INMEM)) {
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PROC_UNLOCK(p);
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continue;
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}
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swtime = (ticks - p->p_swtick) / hz;
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FOREACH_THREAD_IN_PROC(p, td) {
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/*
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* An otherwise runnable thread of a process
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* swapped out has only the TDI_SWAPPED bit set.
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*
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*/
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thread_lock(td);
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if (td->td_inhibitors == TDI_SWAPPED) {
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slptime = (ticks - td->td_slptick) / hz;
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pri = swtime + slptime;
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if ((td->td_flags & TDF_SWAPINREQ) == 0)
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pri -= p->p_nice * 8;
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/*
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* if this thread is higher priority
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* and there is enough space, then select
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* this process instead of the previous
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* selection.
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*/
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if (pri > ppri) {
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pp = p;
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ppri = pri;
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}
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}
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thread_unlock(td);
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}
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PROC_UNLOCK(p);
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}
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sx_sunlock(&allproc_lock);
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/*
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* Nothing to do, back to sleep.
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*/
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if ((p = pp) == NULL) {
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tsleep(&proc0, PVM, "swapin", MAXSLP * hz / 2);
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goto loop;
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}
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PROC_LOCK(p);
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/*
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* Another process may be bringing or may have already
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* brought this process in while we traverse all threads.
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* Or, this process may even be being swapped out again.
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*/
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if (p->p_flag & (P_INMEM | P_SWAPPINGOUT | P_SWAPPINGIN)) {
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PROC_UNLOCK(p);
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goto loop;
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}
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/*
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* We would like to bring someone in. (only if there is space).
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* [What checks the space? ]
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*/
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faultin(p);
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PROC_UNLOCK(p);
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goto loop;
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}
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void
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kick_proc0(void)
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{
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wakeup(&proc0);
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}
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#ifndef NO_SWAPPING
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/*
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* Swap_idle_threshold1 is the guaranteed swapped in time for a process
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*/
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static int swap_idle_threshold1 = 2;
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SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold1, CTLFLAG_RW,
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&swap_idle_threshold1, 0, "Guaranteed swapped in time for a process");
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/*
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* Swap_idle_threshold2 is the time that a process can be idle before
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* it will be swapped out, if idle swapping is enabled.
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*/
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static int swap_idle_threshold2 = 10;
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SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold2, CTLFLAG_RW,
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&swap_idle_threshold2, 0, "Time before a process will be swapped out");
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/*
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* First, if any processes have been sleeping or stopped for at least
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* "swap_idle_threshold1" seconds, they are swapped out. If, however,
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* no such processes exist, then the longest-sleeping or stopped
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* process is swapped out. Finally, and only as a last resort, if
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* there are no sleeping or stopped processes, the longest-resident
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* process is swapped out.
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*/
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void
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swapout_procs(action)
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int action;
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{
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struct proc *p;
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struct thread *td;
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int didswap = 0;
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retry:
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sx_slock(&allproc_lock);
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FOREACH_PROC_IN_SYSTEM(p) {
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struct vmspace *vm;
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int minslptime = 100000;
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int slptime;
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PROC_LOCK(p);
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/*
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* Watch out for a process in
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* creation. It may have no
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* address space or lock yet.
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*/
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if (p->p_state == PRS_NEW) {
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PROC_UNLOCK(p);
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continue;
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}
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/*
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* An aio daemon switches its
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* address space while running.
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* Perform a quick check whether
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* a process has P_SYSTEM.
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* Filter out exiting processes.
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*/
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if ((p->p_flag & (P_SYSTEM | P_WEXIT)) != 0) {
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PROC_UNLOCK(p);
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continue;
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}
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_PHOLD_LITE(p);
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PROC_UNLOCK(p);
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sx_sunlock(&allproc_lock);
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/*
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* Do not swapout a process that
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* is waiting for VM data
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* structures as there is a possible
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* deadlock. Test this first as
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* this may block.
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*
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* Lock the map until swapout
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* finishes, or a thread of this
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* process may attempt to alter
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* the map.
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*/
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vm = vmspace_acquire_ref(p);
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if (vm == NULL)
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goto nextproc2;
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if (!vm_map_trylock(&vm->vm_map))
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goto nextproc1;
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PROC_LOCK(p);
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if (p->p_lock != 1 || (p->p_flag & (P_STOPPED_SINGLE |
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P_TRACED | P_SYSTEM)) != 0)
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goto nextproc;
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/*
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* only aiod changes vmspace, however it will be
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* skipped because of the if statement above checking
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* for P_SYSTEM
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*/
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if ((p->p_flag & (P_INMEM|P_SWAPPINGOUT|P_SWAPPINGIN)) != P_INMEM)
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goto nextproc;
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|
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switch (p->p_state) {
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default:
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/* Don't swap out processes in any sort
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* of 'special' state. */
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break;
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case PRS_NORMAL:
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/*
|
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* do not swapout a realtime process
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* Check all the thread groups..
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*/
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FOREACH_THREAD_IN_PROC(p, td) {
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thread_lock(td);
|
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if (PRI_IS_REALTIME(td->td_pri_class)) {
|
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thread_unlock(td);
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goto nextproc;
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}
|
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slptime = (ticks - td->td_slptick) / hz;
|
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/*
|
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* Guarantee swap_idle_threshold1
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* time in memory.
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*/
|
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if (slptime < swap_idle_threshold1) {
|
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thread_unlock(td);
|
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goto nextproc;
|
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}
|
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|
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/*
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* Do not swapout a process if it is
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* waiting on a critical event of some
|
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* kind or there is a thread whose
|
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* pageable memory may be accessed.
|
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*
|
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* This could be refined to support
|
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* swapping out a thread.
|
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*/
|
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if (!thread_safetoswapout(td)) {
|
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thread_unlock(td);
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goto nextproc;
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}
|
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/*
|
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* If the system is under memory stress,
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* or if we are swapping
|
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* idle processes >= swap_idle_threshold2,
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* then swap the process out.
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*/
|
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if (((action & VM_SWAP_NORMAL) == 0) &&
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(((action & VM_SWAP_IDLE) == 0) ||
|
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(slptime < swap_idle_threshold2))) {
|
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thread_unlock(td);
|
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goto nextproc;
|
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}
|
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|
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if (minslptime > slptime)
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minslptime = slptime;
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thread_unlock(td);
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}
|
||||
|
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/*
|
||||
* If the pageout daemon didn't free enough pages,
|
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* or if this process is idle and the system is
|
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* configured to swap proactively, swap it out.
|
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*/
|
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if ((action & VM_SWAP_NORMAL) ||
|
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((action & VM_SWAP_IDLE) &&
|
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(minslptime > swap_idle_threshold2))) {
|
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_PRELE(p);
|
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if (swapout(p) == 0)
|
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didswap++;
|
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PROC_UNLOCK(p);
|
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vm_map_unlock(&vm->vm_map);
|
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vmspace_free(vm);
|
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goto retry;
|
||||
}
|
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}
|
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nextproc:
|
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PROC_UNLOCK(p);
|
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vm_map_unlock(&vm->vm_map);
|
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nextproc1:
|
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vmspace_free(vm);
|
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nextproc2:
|
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sx_slock(&allproc_lock);
|
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PRELE(p);
|
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}
|
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sx_sunlock(&allproc_lock);
|
||||
/*
|
||||
* If we swapped something out, and another process needed memory,
|
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* then wakeup the sched process.
|
||||
*/
|
||||
if (didswap)
|
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wakeup(&proc0);
|
||||
}
|
||||
|
||||
static void
|
||||
swapclear(p)
|
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struct proc *p;
|
||||
{
|
||||
struct thread *td;
|
||||
|
||||
PROC_LOCK_ASSERT(p, MA_OWNED);
|
||||
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
td->td_flags |= TDF_INMEM;
|
||||
td->td_flags &= ~TDF_SWAPINREQ;
|
||||
TD_CLR_SWAPPED(td);
|
||||
if (TD_CAN_RUN(td))
|
||||
if (setrunnable(td)) {
|
||||
#ifdef INVARIANTS
|
||||
/*
|
||||
* XXX: We just cleared TDI_SWAPPED
|
||||
* above and set TDF_INMEM, so this
|
||||
* should never happen.
|
||||
*/
|
||||
panic("not waking up swapper");
|
||||
#endif
|
||||
}
|
||||
thread_unlock(td);
|
||||
}
|
||||
p->p_flag &= ~(P_SWAPPINGIN|P_SWAPPINGOUT);
|
||||
p->p_flag |= P_INMEM;
|
||||
}
|
||||
|
||||
static int
|
||||
swapout(p)
|
||||
struct proc *p;
|
||||
{
|
||||
struct thread *td;
|
||||
|
||||
PROC_LOCK_ASSERT(p, MA_OWNED);
|
||||
#if defined(SWAP_DEBUG)
|
||||
printf("swapping out %d\n", p->p_pid);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The states of this process and its threads may have changed
|
||||
* by now. Assuming that there is only one pageout daemon thread,
|
||||
* this process should still be in memory.
|
||||
*/
|
||||
KASSERT((p->p_flag & (P_INMEM|P_SWAPPINGOUT|P_SWAPPINGIN)) == P_INMEM,
|
||||
("swapout: lost a swapout race?"));
|
||||
|
||||
/*
|
||||
* remember the process resident count
|
||||
*/
|
||||
p->p_vmspace->vm_swrss = vmspace_resident_count(p->p_vmspace);
|
||||
/*
|
||||
* Check and mark all threads before we proceed.
|
||||
*/
|
||||
p->p_flag &= ~P_INMEM;
|
||||
p->p_flag |= P_SWAPPINGOUT;
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
if (!thread_safetoswapout(td)) {
|
||||
thread_unlock(td);
|
||||
swapclear(p);
|
||||
return (EBUSY);
|
||||
}
|
||||
td->td_flags &= ~TDF_INMEM;
|
||||
TD_SET_SWAPPED(td);
|
||||
thread_unlock(td);
|
||||
}
|
||||
td = FIRST_THREAD_IN_PROC(p);
|
||||
++td->td_ru.ru_nswap;
|
||||
PROC_UNLOCK(p);
|
||||
|
||||
/*
|
||||
* This list is stable because all threads are now prevented from
|
||||
* running. The list is only modified in the context of a running
|
||||
* thread in this process.
|
||||
*/
|
||||
FOREACH_THREAD_IN_PROC(p, td)
|
||||
vm_thread_swapout(td);
|
||||
|
||||
PROC_LOCK(p);
|
||||
p->p_flag &= ~P_SWAPPINGOUT;
|
||||
p->p_swtick = ticks;
|
||||
return (0);
|
||||
}
|
||||
#endif /* !NO_SWAPPING */
|
||||
|
@ -141,19 +141,6 @@ SYSINIT(pagedaemon, SI_SUB_KTHREAD_PAGE, SI_ORDER_SECOND, kproc_start,
|
||||
SDT_PROVIDER_DEFINE(vm);
|
||||
SDT_PROBE_DEFINE(vm, , , vm__lowmem_scan);
|
||||
|
||||
#if !defined(NO_SWAPPING)
|
||||
/* the kernel process "vm_daemon"*/
|
||||
static void vm_daemon(void);
|
||||
static struct proc *vmproc;
|
||||
|
||||
static struct kproc_desc vm_kp = {
|
||||
"vmdaemon",
|
||||
vm_daemon,
|
||||
&vmproc
|
||||
};
|
||||
SYSINIT(vmdaemon, SI_SUB_KTHREAD_VM, SI_ORDER_FIRST, kproc_start, &vm_kp);
|
||||
#endif
|
||||
|
||||
/* Pagedaemon activity rates, in subdivisions of one second. */
|
||||
#define VM_LAUNDER_RATE 10
|
||||
#define VM_INACT_SCAN_RATE 2
|
||||
@ -171,27 +158,12 @@ static enum {
|
||||
VM_LAUNDRY_SHORTFALL
|
||||
} vm_laundry_request = VM_LAUNDRY_IDLE;
|
||||
|
||||
#if !defined(NO_SWAPPING)
|
||||
static int vm_pageout_req_swapout; /* XXX */
|
||||
static int vm_daemon_needed;
|
||||
static struct mtx vm_daemon_mtx;
|
||||
/* Allow for use by vm_pageout before vm_daemon is initialized. */
|
||||
MTX_SYSINIT(vm_daemon, &vm_daemon_mtx, "vm daemon", MTX_DEF);
|
||||
#endif
|
||||
static int vm_pageout_update_period;
|
||||
static int disable_swap_pageouts;
|
||||
static int lowmem_period = 10;
|
||||
static time_t lowmem_uptime;
|
||||
static int swapdev_enabled;
|
||||
|
||||
#if defined(NO_SWAPPING)
|
||||
static int vm_swap_enabled = 0;
|
||||
static int vm_swap_idle_enabled = 0;
|
||||
#else
|
||||
static int vm_swap_enabled = 1;
|
||||
static int vm_swap_idle_enabled = 0;
|
||||
#endif
|
||||
|
||||
static int vm_panic_on_oom = 0;
|
||||
|
||||
SYSCTL_INT(_vm, OID_AUTO, panic_on_oom,
|
||||
@ -209,18 +181,6 @@ SYSCTL_INT(_vm, OID_AUTO, pageout_update_period,
|
||||
SYSCTL_INT(_vm, OID_AUTO, lowmem_period, CTLFLAG_RW, &lowmem_period, 0,
|
||||
"Low memory callback period");
|
||||
|
||||
#if defined(NO_SWAPPING)
|
||||
SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swap_enabled,
|
||||
CTLFLAG_RD, &vm_swap_enabled, 0, "Enable entire process swapout");
|
||||
SYSCTL_INT(_vm, OID_AUTO, swap_idle_enabled,
|
||||
CTLFLAG_RD, &vm_swap_idle_enabled, 0, "Allow swapout on idle criteria");
|
||||
#else
|
||||
SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swap_enabled,
|
||||
CTLFLAG_RW, &vm_swap_enabled, 0, "Enable entire process swapout");
|
||||
SYSCTL_INT(_vm, OID_AUTO, swap_idle_enabled,
|
||||
CTLFLAG_RW, &vm_swap_idle_enabled, 0, "Allow swapout on idle criteria");
|
||||
#endif
|
||||
|
||||
SYSCTL_INT(_vm, OID_AUTO, disable_swapspace_pageouts,
|
||||
CTLFLAG_RW, &disable_swap_pageouts, 0, "Disallow swapout of dirty pages");
|
||||
|
||||
@ -262,11 +222,6 @@ static boolean_t vm_pageout_fallback_object_lock(vm_page_t, vm_page_t *);
|
||||
static int vm_pageout_launder(struct vm_domain *vmd, int launder,
|
||||
bool in_shortfall);
|
||||
static void vm_pageout_laundry_worker(void *arg);
|
||||
#if !defined(NO_SWAPPING)
|
||||
static void vm_pageout_map_deactivate_pages(vm_map_t, long);
|
||||
static void vm_pageout_object_deactivate_pages(pmap_t, vm_object_t, long);
|
||||
static void vm_req_vmdaemon(int req);
|
||||
#endif
|
||||
static boolean_t vm_pageout_page_lock(vm_page_t, vm_page_t *);
|
||||
|
||||
/*
|
||||
@ -632,171 +587,6 @@ vm_pageout_swapoff(void *arg __unused, struct swdevt *sp __unused)
|
||||
atomic_store_rel_int(&swapdev_enabled, 0);
|
||||
}
|
||||
|
||||
#if !defined(NO_SWAPPING)
|
||||
/*
|
||||
* vm_pageout_object_deactivate_pages
|
||||
*
|
||||
* Deactivate enough pages to satisfy the inactive target
|
||||
* requirements.
|
||||
*
|
||||
* The object and map must be locked.
|
||||
*/
|
||||
static void
|
||||
vm_pageout_object_deactivate_pages(pmap_t pmap, vm_object_t first_object,
|
||||
long desired)
|
||||
{
|
||||
vm_object_t backing_object, object;
|
||||
vm_page_t p;
|
||||
int act_delta, remove_mode;
|
||||
|
||||
VM_OBJECT_ASSERT_LOCKED(first_object);
|
||||
if ((first_object->flags & OBJ_FICTITIOUS) != 0)
|
||||
return;
|
||||
for (object = first_object;; object = backing_object) {
|
||||
if (pmap_resident_count(pmap) <= desired)
|
||||
goto unlock_return;
|
||||
VM_OBJECT_ASSERT_LOCKED(object);
|
||||
if ((object->flags & OBJ_UNMANAGED) != 0 ||
|
||||
object->paging_in_progress != 0)
|
||||
goto unlock_return;
|
||||
|
||||
remove_mode = 0;
|
||||
if (object->shadow_count > 1)
|
||||
remove_mode = 1;
|
||||
/*
|
||||
* Scan the object's entire memory queue.
|
||||
*/
|
||||
TAILQ_FOREACH(p, &object->memq, listq) {
|
||||
if (pmap_resident_count(pmap) <= desired)
|
||||
goto unlock_return;
|
||||
if (vm_page_busied(p))
|
||||
continue;
|
||||
VM_CNT_INC(v_pdpages);
|
||||
vm_page_lock(p);
|
||||
if (p->wire_count != 0 || p->hold_count != 0 ||
|
||||
!pmap_page_exists_quick(pmap, p)) {
|
||||
vm_page_unlock(p);
|
||||
continue;
|
||||
}
|
||||
act_delta = pmap_ts_referenced(p);
|
||||
if ((p->aflags & PGA_REFERENCED) != 0) {
|
||||
if (act_delta == 0)
|
||||
act_delta = 1;
|
||||
vm_page_aflag_clear(p, PGA_REFERENCED);
|
||||
}
|
||||
if (!vm_page_active(p) && act_delta != 0) {
|
||||
vm_page_activate(p);
|
||||
p->act_count += act_delta;
|
||||
} else if (vm_page_active(p)) {
|
||||
if (act_delta == 0) {
|
||||
p->act_count -= min(p->act_count,
|
||||
ACT_DECLINE);
|
||||
if (!remove_mode && p->act_count == 0) {
|
||||
pmap_remove_all(p);
|
||||
vm_page_deactivate(p);
|
||||
} else
|
||||
vm_page_requeue(p);
|
||||
} else {
|
||||
vm_page_activate(p);
|
||||
if (p->act_count < ACT_MAX -
|
||||
ACT_ADVANCE)
|
||||
p->act_count += ACT_ADVANCE;
|
||||
vm_page_requeue(p);
|
||||
}
|
||||
} else if (vm_page_inactive(p))
|
||||
pmap_remove_all(p);
|
||||
vm_page_unlock(p);
|
||||
}
|
||||
if ((backing_object = object->backing_object) == NULL)
|
||||
goto unlock_return;
|
||||
VM_OBJECT_RLOCK(backing_object);
|
||||
if (object != first_object)
|
||||
VM_OBJECT_RUNLOCK(object);
|
||||
}
|
||||
unlock_return:
|
||||
if (object != first_object)
|
||||
VM_OBJECT_RUNLOCK(object);
|
||||
}
|
||||
|
||||
/*
|
||||
* deactivate some number of pages in a map, try to do it fairly, but
|
||||
* that is really hard to do.
|
||||
*/
|
||||
static void
|
||||
vm_pageout_map_deactivate_pages(map, desired)
|
||||
vm_map_t map;
|
||||
long desired;
|
||||
{
|
||||
vm_map_entry_t tmpe;
|
||||
vm_object_t obj, bigobj;
|
||||
int nothingwired;
|
||||
|
||||
if (!vm_map_trylock(map))
|
||||
return;
|
||||
|
||||
bigobj = NULL;
|
||||
nothingwired = TRUE;
|
||||
|
||||
/*
|
||||
* first, search out the biggest object, and try to free pages from
|
||||
* that.
|
||||
*/
|
||||
tmpe = map->header.next;
|
||||
while (tmpe != &map->header) {
|
||||
if ((tmpe->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
||||
obj = tmpe->object.vm_object;
|
||||
if (obj != NULL && VM_OBJECT_TRYRLOCK(obj)) {
|
||||
if (obj->shadow_count <= 1 &&
|
||||
(bigobj == NULL ||
|
||||
bigobj->resident_page_count < obj->resident_page_count)) {
|
||||
if (bigobj != NULL)
|
||||
VM_OBJECT_RUNLOCK(bigobj);
|
||||
bigobj = obj;
|
||||
} else
|
||||
VM_OBJECT_RUNLOCK(obj);
|
||||
}
|
||||
}
|
||||
if (tmpe->wired_count > 0)
|
||||
nothingwired = FALSE;
|
||||
tmpe = tmpe->next;
|
||||
}
|
||||
|
||||
if (bigobj != NULL) {
|
||||
vm_pageout_object_deactivate_pages(map->pmap, bigobj, desired);
|
||||
VM_OBJECT_RUNLOCK(bigobj);
|
||||
}
|
||||
/*
|
||||
* Next, hunt around for other pages to deactivate. We actually
|
||||
* do this search sort of wrong -- .text first is not the best idea.
|
||||
*/
|
||||
tmpe = map->header.next;
|
||||
while (tmpe != &map->header) {
|
||||
if (pmap_resident_count(vm_map_pmap(map)) <= desired)
|
||||
break;
|
||||
if ((tmpe->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
||||
obj = tmpe->object.vm_object;
|
||||
if (obj != NULL) {
|
||||
VM_OBJECT_RLOCK(obj);
|
||||
vm_pageout_object_deactivate_pages(map->pmap, obj, desired);
|
||||
VM_OBJECT_RUNLOCK(obj);
|
||||
}
|
||||
}
|
||||
tmpe = tmpe->next;
|
||||
}
|
||||
|
||||
/*
|
||||
* Remove all mappings if a process is swapped out, this will free page
|
||||
* table pages.
|
||||
*/
|
||||
if (desired == 0 && nothingwired) {
|
||||
pmap_remove(vm_map_pmap(map), vm_map_min(map),
|
||||
vm_map_max(map));
|
||||
}
|
||||
|
||||
vm_map_unlock(map);
|
||||
}
|
||||
#endif /* !defined(NO_SWAPPING) */
|
||||
|
||||
/*
|
||||
* Attempt to acquire all of the necessary locks to launder a page and
|
||||
* then call through the clustering layer to PUTPAGES. Wait a short
|
||||
@ -1563,14 +1353,12 @@ vm_pageout_scan(struct vm_domain *vmd, int pass)
|
||||
vm_pagequeue_unlock(pq);
|
||||
}
|
||||
|
||||
#if !defined(NO_SWAPPING)
|
||||
/*
|
||||
* Wakeup the swapout daemon if we didn't free the targeted number of
|
||||
* pages.
|
||||
*/
|
||||
if (vm_swap_enabled && page_shortage > 0)
|
||||
vm_req_vmdaemon(VM_SWAP_NORMAL);
|
||||
#endif
|
||||
if (page_shortage > 0)
|
||||
vm_swapout_run();
|
||||
|
||||
/*
|
||||
* If the inactive queue scan fails repeatedly to meet its
|
||||
@ -1720,19 +1508,8 @@ vm_pageout_scan(struct vm_domain *vmd, int pass)
|
||||
vm_page_unlock(m);
|
||||
}
|
||||
vm_pagequeue_unlock(pq);
|
||||
#if !defined(NO_SWAPPING)
|
||||
/*
|
||||
* Idle process swapout -- run once per second when we are reclaiming
|
||||
* pages.
|
||||
*/
|
||||
if (vm_swap_idle_enabled && pass > 0) {
|
||||
static long lsec;
|
||||
if (time_second != lsec) {
|
||||
vm_req_vmdaemon(VM_SWAP_IDLE);
|
||||
lsec = time_second;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
if (pass > 0)
|
||||
vm_swapout_run_idle();
|
||||
return (page_shortage <= 0);
|
||||
}
|
||||
|
||||
@ -2158,167 +1935,3 @@ pagedaemon_wakeup(void)
|
||||
wakeup(&vm_pageout_wanted);
|
||||
}
|
||||
}
|
||||
|
||||
#if !defined(NO_SWAPPING)
|
||||
static void
|
||||
vm_req_vmdaemon(int req)
|
||||
{
|
||||
static int lastrun = 0;
|
||||
|
||||
mtx_lock(&vm_daemon_mtx);
|
||||
vm_pageout_req_swapout |= req;
|
||||
if ((ticks > (lastrun + hz)) || (ticks < lastrun)) {
|
||||
wakeup(&vm_daemon_needed);
|
||||
lastrun = ticks;
|
||||
}
|
||||
mtx_unlock(&vm_daemon_mtx);
|
||||
}
|
||||
|
||||
static void
|
||||
vm_daemon(void)
|
||||
{
|
||||
struct rlimit rsslim;
|
||||
struct proc *p;
|
||||
struct thread *td;
|
||||
struct vmspace *vm;
|
||||
int breakout, swapout_flags, tryagain, attempts;
|
||||
#ifdef RACCT
|
||||
uint64_t rsize, ravailable;
|
||||
#endif
|
||||
|
||||
while (TRUE) {
|
||||
mtx_lock(&vm_daemon_mtx);
|
||||
msleep(&vm_daemon_needed, &vm_daemon_mtx, PPAUSE, "psleep",
|
||||
#ifdef RACCT
|
||||
racct_enable ? hz : 0
|
||||
#else
|
||||
0
|
||||
#endif
|
||||
);
|
||||
swapout_flags = vm_pageout_req_swapout;
|
||||
vm_pageout_req_swapout = 0;
|
||||
mtx_unlock(&vm_daemon_mtx);
|
||||
if (swapout_flags)
|
||||
swapout_procs(swapout_flags);
|
||||
|
||||
/*
|
||||
* scan the processes for exceeding their rlimits or if
|
||||
* process is swapped out -- deactivate pages
|
||||
*/
|
||||
tryagain = 0;
|
||||
attempts = 0;
|
||||
again:
|
||||
attempts++;
|
||||
sx_slock(&allproc_lock);
|
||||
FOREACH_PROC_IN_SYSTEM(p) {
|
||||
vm_pindex_t limit, size;
|
||||
|
||||
/*
|
||||
* if this is a system process or if we have already
|
||||
* looked at this process, skip it.
|
||||
*/
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state != PRS_NORMAL ||
|
||||
p->p_flag & (P_INEXEC | P_SYSTEM | P_WEXIT)) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* if the process is in a non-running type state,
|
||||
* don't touch it.
|
||||
*/
|
||||
breakout = 0;
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
if (!TD_ON_RUNQ(td) &&
|
||||
!TD_IS_RUNNING(td) &&
|
||||
!TD_IS_SLEEPING(td) &&
|
||||
!TD_IS_SUSPENDED(td)) {
|
||||
thread_unlock(td);
|
||||
breakout = 1;
|
||||
break;
|
||||
}
|
||||
thread_unlock(td);
|
||||
}
|
||||
if (breakout) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* get a limit
|
||||
*/
|
||||
lim_rlimit_proc(p, RLIMIT_RSS, &rsslim);
|
||||
limit = OFF_TO_IDX(
|
||||
qmin(rsslim.rlim_cur, rsslim.rlim_max));
|
||||
|
||||
/*
|
||||
* let processes that are swapped out really be
|
||||
* swapped out set the limit to nothing (will force a
|
||||
* swap-out.)
|
||||
*/
|
||||
if ((p->p_flag & P_INMEM) == 0)
|
||||
limit = 0; /* XXX */
|
||||
vm = vmspace_acquire_ref(p);
|
||||
_PHOLD_LITE(p);
|
||||
PROC_UNLOCK(p);
|
||||
if (vm == NULL) {
|
||||
PRELE(p);
|
||||
continue;
|
||||
}
|
||||
sx_sunlock(&allproc_lock);
|
||||
|
||||
size = vmspace_resident_count(vm);
|
||||
if (size >= limit) {
|
||||
vm_pageout_map_deactivate_pages(
|
||||
&vm->vm_map, limit);
|
||||
size = vmspace_resident_count(vm);
|
||||
}
|
||||
#ifdef RACCT
|
||||
if (racct_enable) {
|
||||
rsize = IDX_TO_OFF(size);
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state == PRS_NORMAL)
|
||||
racct_set(p, RACCT_RSS, rsize);
|
||||
ravailable = racct_get_available(p, RACCT_RSS);
|
||||
PROC_UNLOCK(p);
|
||||
if (rsize > ravailable) {
|
||||
/*
|
||||
* Don't be overly aggressive; this
|
||||
* might be an innocent process,
|
||||
* and the limit could've been exceeded
|
||||
* by some memory hog. Don't try
|
||||
* to deactivate more than 1/4th
|
||||
* of process' resident set size.
|
||||
*/
|
||||
if (attempts <= 8) {
|
||||
if (ravailable < rsize -
|
||||
(rsize / 4)) {
|
||||
ravailable = rsize -
|
||||
(rsize / 4);
|
||||
}
|
||||
}
|
||||
vm_pageout_map_deactivate_pages(
|
||||
&vm->vm_map,
|
||||
OFF_TO_IDX(ravailable));
|
||||
/* Update RSS usage after paging out. */
|
||||
size = vmspace_resident_count(vm);
|
||||
rsize = IDX_TO_OFF(size);
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state == PRS_NORMAL)
|
||||
racct_set(p, RACCT_RSS, rsize);
|
||||
PROC_UNLOCK(p);
|
||||
if (rsize > ravailable)
|
||||
tryagain = 1;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
vmspace_free(vm);
|
||||
sx_slock(&allproc_lock);
|
||||
PRELE(p);
|
||||
}
|
||||
sx_sunlock(&allproc_lock);
|
||||
if (tryagain != 0 && attempts <= 10)
|
||||
goto again;
|
||||
}
|
||||
}
|
||||
#endif /* !defined(NO_SWAPPING) */
|
||||
|
@ -77,12 +77,6 @@ extern int vm_pageout_page_count;
|
||||
extern bool vm_pageout_wanted;
|
||||
extern bool vm_pages_needed;
|
||||
|
||||
/*
|
||||
* Swap out requests
|
||||
*/
|
||||
#define VM_SWAP_NORMAL 1
|
||||
#define VM_SWAP_IDLE 2
|
||||
|
||||
#define VM_OOM_MEM 1
|
||||
#define VM_OOM_SWAPZ 2
|
||||
|
||||
@ -109,5 +103,8 @@ extern void vm_waitpfault(void);
|
||||
#ifdef _KERNEL
|
||||
int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *);
|
||||
void vm_pageout_oom(int shortage);
|
||||
|
||||
void vm_swapout_run(void);
|
||||
void vm_swapout_run_idle(void);
|
||||
#endif
|
||||
#endif /* _VM_VM_PAGEOUT_H_ */
|
||||
|
975
sys/vm/vm_swapout.c
Normal file
975
sys/vm/vm_swapout.c
Normal file
@ -0,0 +1,975 @@
|
||||
/*-
|
||||
* Copyright (c) 1991 Regents of the University of California.
|
||||
* All rights reserved.
|
||||
* Copyright (c) 1994 John S. Dyson
|
||||
* All rights reserved.
|
||||
* Copyright (c) 1994 David Greenman
|
||||
* All rights reserved.
|
||||
* Copyright (c) 2005 Yahoo! Technologies Norway AS
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to Berkeley by
|
||||
* The Mach Operating System project at Carnegie-Mellon University.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)vm_pageout.c 7.4 (Berkeley) 5/7/91
|
||||
*
|
||||
*
|
||||
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
|
||||
*
|
||||
* Permission to use, copy, modify and distribute this software and
|
||||
* its documentation is hereby granted, provided that both the copyright
|
||||
* notice and this permission notice appear in all copies of the
|
||||
* software, derivative works or modified versions, and any portions
|
||||
* thereof, and that both notices appear in supporting documentation.
|
||||
*
|
||||
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
||||
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
||||
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
||||
*
|
||||
* Carnegie Mellon requests users of this software to return to
|
||||
*
|
||||
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
||||
* School of Computer Science
|
||||
* Carnegie Mellon University
|
||||
* Pittsburgh PA 15213-3890
|
||||
*
|
||||
* any improvements or extensions that they make and grant Carnegie the
|
||||
* rights to redistribute these changes.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include "opt_kstack_pages.h"
|
||||
#include "opt_kstack_max_pages.h"
|
||||
#include "opt_vm.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/limits.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/eventhandler.h>
|
||||
#include <sys/lock.h>
|
||||
#include <sys/mutex.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/_kstack_cache.h>
|
||||
#include <sys/kthread.h>
|
||||
#include <sys/ktr.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/racct.h>
|
||||
#include <sys/resourcevar.h>
|
||||
#include <sys/sched.h>
|
||||
#include <sys/sdt.h>
|
||||
#include <sys/signalvar.h>
|
||||
#include <sys/smp.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/vnode.h>
|
||||
#include <sys/vmmeter.h>
|
||||
#include <sys/rwlock.h>
|
||||
#include <sys/sx.h>
|
||||
#include <sys/sysctl.h>
|
||||
|
||||
#include <vm/vm.h>
|
||||
#include <vm/vm_param.h>
|
||||
#include <vm/vm_object.h>
|
||||
#include <vm/vm_page.h>
|
||||
#include <vm/vm_map.h>
|
||||
#include <vm/vm_pageout.h>
|
||||
#include <vm/vm_pager.h>
|
||||
#include <vm/vm_phys.h>
|
||||
#include <vm/swap_pager.h>
|
||||
#include <vm/vm_extern.h>
|
||||
#include <vm/uma.h>
|
||||
|
||||
/* the kernel process "vm_daemon" */
|
||||
static void vm_daemon(void);
|
||||
static struct proc *vmproc;
|
||||
|
||||
static struct kproc_desc vm_kp = {
|
||||
"vmdaemon",
|
||||
vm_daemon,
|
||||
&vmproc
|
||||
};
|
||||
SYSINIT(vmdaemon, SI_SUB_KTHREAD_VM, SI_ORDER_FIRST, kproc_start, &vm_kp);
|
||||
|
||||
static int vm_swap_enabled = 1;
|
||||
static int vm_swap_idle_enabled = 0;
|
||||
|
||||
SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swap_enabled, CTLFLAG_RW,
|
||||
&vm_swap_enabled, 0,
|
||||
"Enable entire process swapout");
|
||||
SYSCTL_INT(_vm, OID_AUTO, swap_idle_enabled, CTLFLAG_RW,
|
||||
&vm_swap_idle_enabled, 0,
|
||||
"Allow swapout on idle criteria");
|
||||
|
||||
/*
|
||||
* Swap_idle_threshold1 is the guaranteed swapped in time for a process
|
||||
*/
|
||||
static int swap_idle_threshold1 = 2;
|
||||
SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold1, CTLFLAG_RW,
|
||||
&swap_idle_threshold1, 0,
|
||||
"Guaranteed swapped in time for a process");
|
||||
|
||||
/*
|
||||
* Swap_idle_threshold2 is the time that a process can be idle before
|
||||
* it will be swapped out, if idle swapping is enabled.
|
||||
*/
|
||||
static int swap_idle_threshold2 = 10;
|
||||
SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold2, CTLFLAG_RW,
|
||||
&swap_idle_threshold2, 0,
|
||||
"Time before a process will be swapped out");
|
||||
|
||||
static int vm_pageout_req_swapout; /* XXX */
|
||||
static int vm_daemon_needed;
|
||||
static struct mtx vm_daemon_mtx;
|
||||
/* Allow for use by vm_pageout before vm_daemon is initialized. */
|
||||
MTX_SYSINIT(vm_daemon, &vm_daemon_mtx, "vm daemon", MTX_DEF);
|
||||
|
||||
static void swapclear(struct proc *);
|
||||
static int swapout(struct proc *);
|
||||
static void vm_swapout_map_deactivate_pages(vm_map_t, long);
|
||||
static void vm_swapout_object_deactivate_pages(pmap_t, vm_object_t, long);
|
||||
static void swapout_procs(int action);
|
||||
static void vm_req_vmdaemon(int req);
|
||||
static void vm_thread_swapin(struct thread *td);
|
||||
static void vm_thread_swapout(struct thread *td);
|
||||
|
||||
/*
|
||||
* vm_swapout_object_deactivate_pages
|
||||
*
|
||||
* Deactivate enough pages to satisfy the inactive target
|
||||
* requirements.
|
||||
*
|
||||
* The object and map must be locked.
|
||||
*/
|
||||
static void
|
||||
vm_swapout_object_deactivate_pages(pmap_t pmap, vm_object_t first_object,
|
||||
long desired)
|
||||
{
|
||||
vm_object_t backing_object, object;
|
||||
vm_page_t p;
|
||||
int act_delta, remove_mode;
|
||||
|
||||
VM_OBJECT_ASSERT_LOCKED(first_object);
|
||||
if ((first_object->flags & OBJ_FICTITIOUS) != 0)
|
||||
return;
|
||||
for (object = first_object;; object = backing_object) {
|
||||
if (pmap_resident_count(pmap) <= desired)
|
||||
goto unlock_return;
|
||||
VM_OBJECT_ASSERT_LOCKED(object);
|
||||
if ((object->flags & OBJ_UNMANAGED) != 0 ||
|
||||
object->paging_in_progress != 0)
|
||||
goto unlock_return;
|
||||
|
||||
remove_mode = 0;
|
||||
if (object->shadow_count > 1)
|
||||
remove_mode = 1;
|
||||
/*
|
||||
* Scan the object's entire memory queue.
|
||||
*/
|
||||
TAILQ_FOREACH(p, &object->memq, listq) {
|
||||
if (pmap_resident_count(pmap) <= desired)
|
||||
goto unlock_return;
|
||||
if (vm_page_busied(p))
|
||||
continue;
|
||||
VM_CNT_INC(v_pdpages);
|
||||
vm_page_lock(p);
|
||||
if (p->wire_count != 0 || p->hold_count != 0 ||
|
||||
!pmap_page_exists_quick(pmap, p)) {
|
||||
vm_page_unlock(p);
|
||||
continue;
|
||||
}
|
||||
act_delta = pmap_ts_referenced(p);
|
||||
if ((p->aflags & PGA_REFERENCED) != 0) {
|
||||
if (act_delta == 0)
|
||||
act_delta = 1;
|
||||
vm_page_aflag_clear(p, PGA_REFERENCED);
|
||||
}
|
||||
if (!vm_page_active(p) && act_delta != 0) {
|
||||
vm_page_activate(p);
|
||||
p->act_count += act_delta;
|
||||
} else if (vm_page_active(p)) {
|
||||
if (act_delta == 0) {
|
||||
p->act_count -= min(p->act_count,
|
||||
ACT_DECLINE);
|
||||
if (!remove_mode && p->act_count == 0) {
|
||||
pmap_remove_all(p);
|
||||
vm_page_deactivate(p);
|
||||
} else
|
||||
vm_page_requeue(p);
|
||||
} else {
|
||||
vm_page_activate(p);
|
||||
if (p->act_count < ACT_MAX -
|
||||
ACT_ADVANCE)
|
||||
p->act_count += ACT_ADVANCE;
|
||||
vm_page_requeue(p);
|
||||
}
|
||||
} else if (vm_page_inactive(p))
|
||||
pmap_remove_all(p);
|
||||
vm_page_unlock(p);
|
||||
}
|
||||
if ((backing_object = object->backing_object) == NULL)
|
||||
goto unlock_return;
|
||||
VM_OBJECT_RLOCK(backing_object);
|
||||
if (object != first_object)
|
||||
VM_OBJECT_RUNLOCK(object);
|
||||
}
|
||||
unlock_return:
|
||||
if (object != first_object)
|
||||
VM_OBJECT_RUNLOCK(object);
|
||||
}
|
||||
|
||||
/*
|
||||
* deactivate some number of pages in a map, try to do it fairly, but
|
||||
* that is really hard to do.
|
||||
*/
|
||||
static void
|
||||
vm_swapout_map_deactivate_pages(vm_map_t map, long desired)
|
||||
{
|
||||
vm_map_entry_t tmpe;
|
||||
vm_object_t obj, bigobj;
|
||||
int nothingwired;
|
||||
|
||||
if (!vm_map_trylock(map))
|
||||
return;
|
||||
|
||||
bigobj = NULL;
|
||||
nothingwired = TRUE;
|
||||
|
||||
/*
|
||||
* first, search out the biggest object, and try to free pages from
|
||||
* that.
|
||||
*/
|
||||
tmpe = map->header.next;
|
||||
while (tmpe != &map->header) {
|
||||
if ((tmpe->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
||||
obj = tmpe->object.vm_object;
|
||||
if (obj != NULL && VM_OBJECT_TRYRLOCK(obj)) {
|
||||
if (obj->shadow_count <= 1 &&
|
||||
(bigobj == NULL ||
|
||||
bigobj->resident_page_count <
|
||||
obj->resident_page_count)) {
|
||||
if (bigobj != NULL)
|
||||
VM_OBJECT_RUNLOCK(bigobj);
|
||||
bigobj = obj;
|
||||
} else
|
||||
VM_OBJECT_RUNLOCK(obj);
|
||||
}
|
||||
}
|
||||
if (tmpe->wired_count > 0)
|
||||
nothingwired = FALSE;
|
||||
tmpe = tmpe->next;
|
||||
}
|
||||
|
||||
if (bigobj != NULL) {
|
||||
vm_swapout_object_deactivate_pages(map->pmap, bigobj, desired);
|
||||
VM_OBJECT_RUNLOCK(bigobj);
|
||||
}
|
||||
/*
|
||||
* Next, hunt around for other pages to deactivate. We actually
|
||||
* do this search sort of wrong -- .text first is not the best idea.
|
||||
*/
|
||||
tmpe = map->header.next;
|
||||
while (tmpe != &map->header) {
|
||||
if (pmap_resident_count(vm_map_pmap(map)) <= desired)
|
||||
break;
|
||||
if ((tmpe->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
||||
obj = tmpe->object.vm_object;
|
||||
if (obj != NULL) {
|
||||
VM_OBJECT_RLOCK(obj);
|
||||
vm_swapout_object_deactivate_pages(map->pmap,
|
||||
obj, desired);
|
||||
VM_OBJECT_RUNLOCK(obj);
|
||||
}
|
||||
}
|
||||
tmpe = tmpe->next;
|
||||
}
|
||||
|
||||
/*
|
||||
* Remove all mappings if a process is swapped out, this will free page
|
||||
* table pages.
|
||||
*/
|
||||
if (desired == 0 && nothingwired) {
|
||||
pmap_remove(vm_map_pmap(map), vm_map_min(map),
|
||||
vm_map_max(map));
|
||||
}
|
||||
|
||||
vm_map_unlock(map);
|
||||
}
|
||||
|
||||
/*
|
||||
* Swap out requests
|
||||
*/
|
||||
#define VM_SWAP_NORMAL 1
|
||||
#define VM_SWAP_IDLE 2
|
||||
|
||||
void
|
||||
vm_swapout_run(void)
|
||||
{
|
||||
|
||||
if (vm_swap_enabled)
|
||||
vm_req_vmdaemon(VM_SWAP_NORMAL);
|
||||
}
|
||||
|
||||
/*
|
||||
* Idle process swapout -- run once per second when pagedaemons are
|
||||
* reclaiming pages.
|
||||
*/
|
||||
void
|
||||
vm_swapout_run_idle(void)
|
||||
{
|
||||
static long lsec;
|
||||
|
||||
if (!vm_swap_idle_enabled || time_second == lsec)
|
||||
return;
|
||||
vm_req_vmdaemon(VM_SWAP_IDLE);
|
||||
lsec = time_second;
|
||||
}
|
||||
|
||||
static void
|
||||
vm_req_vmdaemon(int req)
|
||||
{
|
||||
static int lastrun = 0;
|
||||
|
||||
mtx_lock(&vm_daemon_mtx);
|
||||
vm_pageout_req_swapout |= req;
|
||||
if ((ticks > (lastrun + hz)) || (ticks < lastrun)) {
|
||||
wakeup(&vm_daemon_needed);
|
||||
lastrun = ticks;
|
||||
}
|
||||
mtx_unlock(&vm_daemon_mtx);
|
||||
}
|
||||
|
||||
static void
|
||||
vm_daemon(void)
|
||||
{
|
||||
struct rlimit rsslim;
|
||||
struct proc *p;
|
||||
struct thread *td;
|
||||
struct vmspace *vm;
|
||||
int breakout, swapout_flags, tryagain, attempts;
|
||||
#ifdef RACCT
|
||||
uint64_t rsize, ravailable;
|
||||
#endif
|
||||
|
||||
while (TRUE) {
|
||||
mtx_lock(&vm_daemon_mtx);
|
||||
msleep(&vm_daemon_needed, &vm_daemon_mtx, PPAUSE, "psleep",
|
||||
#ifdef RACCT
|
||||
racct_enable ? hz : 0
|
||||
#else
|
||||
0
|
||||
#endif
|
||||
);
|
||||
swapout_flags = vm_pageout_req_swapout;
|
||||
vm_pageout_req_swapout = 0;
|
||||
mtx_unlock(&vm_daemon_mtx);
|
||||
if (swapout_flags)
|
||||
swapout_procs(swapout_flags);
|
||||
|
||||
/*
|
||||
* scan the processes for exceeding their rlimits or if
|
||||
* process is swapped out -- deactivate pages
|
||||
*/
|
||||
tryagain = 0;
|
||||
attempts = 0;
|
||||
again:
|
||||
attempts++;
|
||||
sx_slock(&allproc_lock);
|
||||
FOREACH_PROC_IN_SYSTEM(p) {
|
||||
vm_pindex_t limit, size;
|
||||
|
||||
/*
|
||||
* if this is a system process or if we have already
|
||||
* looked at this process, skip it.
|
||||
*/
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state != PRS_NORMAL ||
|
||||
p->p_flag & (P_INEXEC | P_SYSTEM | P_WEXIT)) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* if the process is in a non-running type state,
|
||||
* don't touch it.
|
||||
*/
|
||||
breakout = 0;
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
if (!TD_ON_RUNQ(td) &&
|
||||
!TD_IS_RUNNING(td) &&
|
||||
!TD_IS_SLEEPING(td) &&
|
||||
!TD_IS_SUSPENDED(td)) {
|
||||
thread_unlock(td);
|
||||
breakout = 1;
|
||||
break;
|
||||
}
|
||||
thread_unlock(td);
|
||||
}
|
||||
if (breakout) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* get a limit
|
||||
*/
|
||||
lim_rlimit_proc(p, RLIMIT_RSS, &rsslim);
|
||||
limit = OFF_TO_IDX(
|
||||
qmin(rsslim.rlim_cur, rsslim.rlim_max));
|
||||
|
||||
/*
|
||||
* let processes that are swapped out really be
|
||||
* swapped out set the limit to nothing (will force a
|
||||
* swap-out.)
|
||||
*/
|
||||
if ((p->p_flag & P_INMEM) == 0)
|
||||
limit = 0; /* XXX */
|
||||
vm = vmspace_acquire_ref(p);
|
||||
_PHOLD_LITE(p);
|
||||
PROC_UNLOCK(p);
|
||||
if (vm == NULL) {
|
||||
PRELE(p);
|
||||
continue;
|
||||
}
|
||||
sx_sunlock(&allproc_lock);
|
||||
|
||||
size = vmspace_resident_count(vm);
|
||||
if (size >= limit) {
|
||||
vm_swapout_map_deactivate_pages(
|
||||
&vm->vm_map, limit);
|
||||
size = vmspace_resident_count(vm);
|
||||
}
|
||||
#ifdef RACCT
|
||||
if (racct_enable) {
|
||||
rsize = IDX_TO_OFF(size);
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state == PRS_NORMAL)
|
||||
racct_set(p, RACCT_RSS, rsize);
|
||||
ravailable = racct_get_available(p, RACCT_RSS);
|
||||
PROC_UNLOCK(p);
|
||||
if (rsize > ravailable) {
|
||||
/*
|
||||
* Don't be overly aggressive; this
|
||||
* might be an innocent process,
|
||||
* and the limit could've been exceeded
|
||||
* by some memory hog. Don't try
|
||||
* to deactivate more than 1/4th
|
||||
* of process' resident set size.
|
||||
*/
|
||||
if (attempts <= 8) {
|
||||
if (ravailable < rsize -
|
||||
(rsize / 4)) {
|
||||
ravailable = rsize -
|
||||
(rsize / 4);
|
||||
}
|
||||
}
|
||||
vm_swapout_map_deactivate_pages(
|
||||
&vm->vm_map,
|
||||
OFF_TO_IDX(ravailable));
|
||||
/* Update RSS usage after paging out. */
|
||||
size = vmspace_resident_count(vm);
|
||||
rsize = IDX_TO_OFF(size);
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state == PRS_NORMAL)
|
||||
racct_set(p, RACCT_RSS, rsize);
|
||||
PROC_UNLOCK(p);
|
||||
if (rsize > ravailable)
|
||||
tryagain = 1;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
vmspace_free(vm);
|
||||
sx_slock(&allproc_lock);
|
||||
PRELE(p);
|
||||
}
|
||||
sx_sunlock(&allproc_lock);
|
||||
if (tryagain != 0 && attempts <= 10)
|
||||
goto again;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Allow a thread's kernel stack to be paged out.
|
||||
*/
|
||||
static void
|
||||
vm_thread_swapout(struct thread *td)
|
||||
{
|
||||
vm_object_t ksobj;
|
||||
vm_page_t m;
|
||||
int i, pages;
|
||||
|
||||
cpu_thread_swapout(td);
|
||||
pages = td->td_kstack_pages;
|
||||
ksobj = td->td_kstack_obj;
|
||||
pmap_qremove(td->td_kstack, pages);
|
||||
VM_OBJECT_WLOCK(ksobj);
|
||||
for (i = 0; i < pages; i++) {
|
||||
m = vm_page_lookup(ksobj, i);
|
||||
if (m == NULL)
|
||||
panic("vm_thread_swapout: kstack already missing?");
|
||||
vm_page_dirty(m);
|
||||
vm_page_lock(m);
|
||||
vm_page_unwire(m, PQ_INACTIVE);
|
||||
vm_page_unlock(m);
|
||||
}
|
||||
VM_OBJECT_WUNLOCK(ksobj);
|
||||
}
|
||||
|
||||
/*
|
||||
* Bring the kernel stack for a specified thread back in.
|
||||
*/
|
||||
static void
|
||||
vm_thread_swapin(struct thread *td)
|
||||
{
|
||||
vm_object_t ksobj;
|
||||
vm_page_t ma[KSTACK_MAX_PAGES];
|
||||
int pages;
|
||||
|
||||
pages = td->td_kstack_pages;
|
||||
ksobj = td->td_kstack_obj;
|
||||
VM_OBJECT_WLOCK(ksobj);
|
||||
(void)vm_page_grab_pages(ksobj, 0, VM_ALLOC_NORMAL | VM_ALLOC_WIRED, ma,
|
||||
pages);
|
||||
for (int i = 0; i < pages;) {
|
||||
int j, a, count, rv;
|
||||
|
||||
vm_page_assert_xbusied(ma[i]);
|
||||
if (ma[i]->valid == VM_PAGE_BITS_ALL) {
|
||||
vm_page_xunbusy(ma[i]);
|
||||
i++;
|
||||
continue;
|
||||
}
|
||||
vm_object_pip_add(ksobj, 1);
|
||||
for (j = i + 1; j < pages; j++)
|
||||
if (ma[j]->valid == VM_PAGE_BITS_ALL)
|
||||
break;
|
||||
rv = vm_pager_has_page(ksobj, ma[i]->pindex, NULL, &a);
|
||||
KASSERT(rv == 1, ("%s: missing page %p", __func__, ma[i]));
|
||||
count = min(a + 1, j - i);
|
||||
rv = vm_pager_get_pages(ksobj, ma + i, count, NULL, NULL);
|
||||
KASSERT(rv == VM_PAGER_OK, ("%s: cannot get kstack for proc %d",
|
||||
__func__, td->td_proc->p_pid));
|
||||
vm_object_pip_wakeup(ksobj);
|
||||
for (j = i; j < i + count; j++)
|
||||
vm_page_xunbusy(ma[j]);
|
||||
i += count;
|
||||
}
|
||||
VM_OBJECT_WUNLOCK(ksobj);
|
||||
pmap_qenter(td->td_kstack, ma, pages);
|
||||
cpu_thread_swapin(td);
|
||||
}
|
||||
|
||||
void
|
||||
faultin(struct proc *p)
|
||||
{
|
||||
struct thread *td;
|
||||
|
||||
PROC_LOCK_ASSERT(p, MA_OWNED);
|
||||
/*
|
||||
* If another process is swapping in this process,
|
||||
* just wait until it finishes.
|
||||
*/
|
||||
if (p->p_flag & P_SWAPPINGIN) {
|
||||
while (p->p_flag & P_SWAPPINGIN)
|
||||
msleep(&p->p_flag, &p->p_mtx, PVM, "faultin", 0);
|
||||
return;
|
||||
}
|
||||
if ((p->p_flag & P_INMEM) == 0) {
|
||||
/*
|
||||
* Don't let another thread swap process p out while we are
|
||||
* busy swapping it in.
|
||||
*/
|
||||
++p->p_lock;
|
||||
p->p_flag |= P_SWAPPINGIN;
|
||||
PROC_UNLOCK(p);
|
||||
|
||||
/*
|
||||
* We hold no lock here because the list of threads
|
||||
* can not change while all threads in the process are
|
||||
* swapped out.
|
||||
*/
|
||||
FOREACH_THREAD_IN_PROC(p, td)
|
||||
vm_thread_swapin(td);
|
||||
PROC_LOCK(p);
|
||||
swapclear(p);
|
||||
p->p_swtick = ticks;
|
||||
|
||||
wakeup(&p->p_flag);
|
||||
|
||||
/* Allow other threads to swap p out now. */
|
||||
--p->p_lock;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* This swapin algorithm attempts to swap-in processes only if there
|
||||
* is enough space for them. Of course, if a process waits for a long
|
||||
* time, it will be swapped in anyway.
|
||||
*/
|
||||
void
|
||||
swapper(void)
|
||||
{
|
||||
struct proc *p;
|
||||
struct thread *td;
|
||||
struct proc *pp;
|
||||
int slptime;
|
||||
int swtime;
|
||||
int ppri;
|
||||
int pri;
|
||||
|
||||
loop:
|
||||
if (vm_page_count_min()) {
|
||||
VM_WAIT;
|
||||
goto loop;
|
||||
}
|
||||
|
||||
pp = NULL;
|
||||
ppri = INT_MIN;
|
||||
sx_slock(&allproc_lock);
|
||||
FOREACH_PROC_IN_SYSTEM(p) {
|
||||
PROC_LOCK(p);
|
||||
if (p->p_state == PRS_NEW ||
|
||||
p->p_flag & (P_SWAPPINGOUT | P_SWAPPINGIN | P_INMEM)) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
swtime = (ticks - p->p_swtick) / hz;
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
/*
|
||||
* An otherwise runnable thread of a process
|
||||
* swapped out has only the TDI_SWAPPED bit set.
|
||||
*/
|
||||
thread_lock(td);
|
||||
if (td->td_inhibitors == TDI_SWAPPED) {
|
||||
slptime = (ticks - td->td_slptick) / hz;
|
||||
pri = swtime + slptime;
|
||||
if ((td->td_flags & TDF_SWAPINREQ) == 0)
|
||||
pri -= p->p_nice * 8;
|
||||
/*
|
||||
* if this thread is higher priority
|
||||
* and there is enough space, then select
|
||||
* this process instead of the previous
|
||||
* selection.
|
||||
*/
|
||||
if (pri > ppri) {
|
||||
pp = p;
|
||||
ppri = pri;
|
||||
}
|
||||
}
|
||||
thread_unlock(td);
|
||||
}
|
||||
PROC_UNLOCK(p);
|
||||
}
|
||||
sx_sunlock(&allproc_lock);
|
||||
|
||||
/*
|
||||
* Nothing to do, back to sleep.
|
||||
*/
|
||||
if ((p = pp) == NULL) {
|
||||
tsleep(&proc0, PVM, "swapin", MAXSLP * hz / 2);
|
||||
goto loop;
|
||||
}
|
||||
PROC_LOCK(p);
|
||||
|
||||
/*
|
||||
* Another process may be bringing or may have already
|
||||
* brought this process in while we traverse all threads.
|
||||
* Or, this process may even be being swapped out again.
|
||||
*/
|
||||
if (p->p_flag & (P_INMEM | P_SWAPPINGOUT | P_SWAPPINGIN)) {
|
||||
PROC_UNLOCK(p);
|
||||
goto loop;
|
||||
}
|
||||
|
||||
/*
|
||||
* We would like to bring someone in. (only if there is space).
|
||||
* [What checks the space? ]
|
||||
*/
|
||||
faultin(p);
|
||||
PROC_UNLOCK(p);
|
||||
goto loop;
|
||||
}
|
||||
|
||||
/*
|
||||
* First, if any processes have been sleeping or stopped for at least
|
||||
* "swap_idle_threshold1" seconds, they are swapped out. If, however,
|
||||
* no such processes exist, then the longest-sleeping or stopped
|
||||
* process is swapped out. Finally, and only as a last resort, if
|
||||
* there are no sleeping or stopped processes, the longest-resident
|
||||
* process is swapped out.
|
||||
*/
|
||||
static void
|
||||
swapout_procs(int action)
|
||||
{
|
||||
struct proc *p;
|
||||
struct thread *td;
|
||||
int didswap = 0;
|
||||
|
||||
retry:
|
||||
sx_slock(&allproc_lock);
|
||||
FOREACH_PROC_IN_SYSTEM(p) {
|
||||
struct vmspace *vm;
|
||||
int minslptime = 100000;
|
||||
int slptime;
|
||||
|
||||
PROC_LOCK(p);
|
||||
/*
|
||||
* Watch out for a process in
|
||||
* creation. It may have no
|
||||
* address space or lock yet.
|
||||
*/
|
||||
if (p->p_state == PRS_NEW) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* An aio daemon switches its
|
||||
* address space while running.
|
||||
* Perform a quick check whether
|
||||
* a process has P_SYSTEM.
|
||||
* Filter out exiting processes.
|
||||
*/
|
||||
if ((p->p_flag & (P_SYSTEM | P_WEXIT)) != 0) {
|
||||
PROC_UNLOCK(p);
|
||||
continue;
|
||||
}
|
||||
_PHOLD_LITE(p);
|
||||
PROC_UNLOCK(p);
|
||||
sx_sunlock(&allproc_lock);
|
||||
|
||||
/*
|
||||
* Do not swapout a process that
|
||||
* is waiting for VM data
|
||||
* structures as there is a possible
|
||||
* deadlock. Test this first as
|
||||
* this may block.
|
||||
*
|
||||
* Lock the map until swapout
|
||||
* finishes, or a thread of this
|
||||
* process may attempt to alter
|
||||
* the map.
|
||||
*/
|
||||
vm = vmspace_acquire_ref(p);
|
||||
if (vm == NULL)
|
||||
goto nextproc2;
|
||||
if (!vm_map_trylock(&vm->vm_map))
|
||||
goto nextproc1;
|
||||
|
||||
PROC_LOCK(p);
|
||||
if (p->p_lock != 1 || (p->p_flag & (P_STOPPED_SINGLE |
|
||||
P_TRACED | P_SYSTEM)) != 0)
|
||||
goto nextproc;
|
||||
|
||||
/*
|
||||
* only aiod changes vmspace, however it will be
|
||||
* skipped because of the if statement above checking
|
||||
* for P_SYSTEM
|
||||
*/
|
||||
if ((p->p_flag & (P_INMEM|P_SWAPPINGOUT|P_SWAPPINGIN)) != P_INMEM)
|
||||
goto nextproc;
|
||||
|
||||
switch (p->p_state) {
|
||||
default:
|
||||
/* Don't swap out processes in any sort
|
||||
* of 'special' state. */
|
||||
break;
|
||||
|
||||
case PRS_NORMAL:
|
||||
/*
|
||||
* do not swapout a realtime process
|
||||
* Check all the thread groups..
|
||||
*/
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
if (PRI_IS_REALTIME(td->td_pri_class)) {
|
||||
thread_unlock(td);
|
||||
goto nextproc;
|
||||
}
|
||||
slptime = (ticks - td->td_slptick) / hz;
|
||||
/*
|
||||
* Guarantee swap_idle_threshold1
|
||||
* time in memory.
|
||||
*/
|
||||
if (slptime < swap_idle_threshold1) {
|
||||
thread_unlock(td);
|
||||
goto nextproc;
|
||||
}
|
||||
|
||||
/*
|
||||
* Do not swapout a process if it is
|
||||
* waiting on a critical event of some
|
||||
* kind or there is a thread whose
|
||||
* pageable memory may be accessed.
|
||||
*
|
||||
* This could be refined to support
|
||||
* swapping out a thread.
|
||||
*/
|
||||
if (!thread_safetoswapout(td)) {
|
||||
thread_unlock(td);
|
||||
goto nextproc;
|
||||
}
|
||||
/*
|
||||
* If the system is under memory stress,
|
||||
* or if we are swapping
|
||||
* idle processes >= swap_idle_threshold2,
|
||||
* then swap the process out.
|
||||
*/
|
||||
if (((action & VM_SWAP_NORMAL) == 0) &&
|
||||
(((action & VM_SWAP_IDLE) == 0) ||
|
||||
(slptime < swap_idle_threshold2))) {
|
||||
thread_unlock(td);
|
||||
goto nextproc;
|
||||
}
|
||||
|
||||
if (minslptime > slptime)
|
||||
minslptime = slptime;
|
||||
thread_unlock(td);
|
||||
}
|
||||
|
||||
/*
|
||||
* If the pageout daemon didn't free enough pages,
|
||||
* or if this process is idle and the system is
|
||||
* configured to swap proactively, swap it out.
|
||||
*/
|
||||
if ((action & VM_SWAP_NORMAL) ||
|
||||
((action & VM_SWAP_IDLE) &&
|
||||
(minslptime > swap_idle_threshold2))) {
|
||||
_PRELE(p);
|
||||
if (swapout(p) == 0)
|
||||
didswap++;
|
||||
PROC_UNLOCK(p);
|
||||
vm_map_unlock(&vm->vm_map);
|
||||
vmspace_free(vm);
|
||||
goto retry;
|
||||
}
|
||||
}
|
||||
nextproc:
|
||||
PROC_UNLOCK(p);
|
||||
vm_map_unlock(&vm->vm_map);
|
||||
nextproc1:
|
||||
vmspace_free(vm);
|
||||
nextproc2:
|
||||
sx_slock(&allproc_lock);
|
||||
PRELE(p);
|
||||
}
|
||||
sx_sunlock(&allproc_lock);
|
||||
/*
|
||||
* If we swapped something out, and another process needed memory,
|
||||
* then wakeup the sched process.
|
||||
*/
|
||||
if (didswap)
|
||||
wakeup(&proc0);
|
||||
}
|
||||
|
||||
static void
|
||||
swapclear(struct proc *p)
|
||||
{
|
||||
struct thread *td;
|
||||
|
||||
PROC_LOCK_ASSERT(p, MA_OWNED);
|
||||
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
td->td_flags |= TDF_INMEM;
|
||||
td->td_flags &= ~TDF_SWAPINREQ;
|
||||
TD_CLR_SWAPPED(td);
|
||||
if (TD_CAN_RUN(td))
|
||||
if (setrunnable(td)) {
|
||||
#ifdef INVARIANTS
|
||||
/*
|
||||
* XXX: We just cleared TDI_SWAPPED
|
||||
* above and set TDF_INMEM, so this
|
||||
* should never happen.
|
||||
*/
|
||||
panic("not waking up swapper");
|
||||
#endif
|
||||
}
|
||||
thread_unlock(td);
|
||||
}
|
||||
p->p_flag &= ~(P_SWAPPINGIN | P_SWAPPINGOUT);
|
||||
p->p_flag |= P_INMEM;
|
||||
}
|
||||
|
||||
static int
|
||||
swapout(struct proc *p)
|
||||
{
|
||||
struct thread *td;
|
||||
|
||||
PROC_LOCK_ASSERT(p, MA_OWNED);
|
||||
|
||||
/*
|
||||
* The states of this process and its threads may have changed
|
||||
* by now. Assuming that there is only one pageout daemon thread,
|
||||
* this process should still be in memory.
|
||||
*/
|
||||
KASSERT((p->p_flag & (P_INMEM | P_SWAPPINGOUT | P_SWAPPINGIN)) ==
|
||||
P_INMEM, ("swapout: lost a swapout race?"));
|
||||
|
||||
/*
|
||||
* remember the process resident count
|
||||
*/
|
||||
p->p_vmspace->vm_swrss = vmspace_resident_count(p->p_vmspace);
|
||||
/*
|
||||
* Check and mark all threads before we proceed.
|
||||
*/
|
||||
p->p_flag &= ~P_INMEM;
|
||||
p->p_flag |= P_SWAPPINGOUT;
|
||||
FOREACH_THREAD_IN_PROC(p, td) {
|
||||
thread_lock(td);
|
||||
if (!thread_safetoswapout(td)) {
|
||||
thread_unlock(td);
|
||||
swapclear(p);
|
||||
return (EBUSY);
|
||||
}
|
||||
td->td_flags &= ~TDF_INMEM;
|
||||
TD_SET_SWAPPED(td);
|
||||
thread_unlock(td);
|
||||
}
|
||||
td = FIRST_THREAD_IN_PROC(p);
|
||||
++td->td_ru.ru_nswap;
|
||||
PROC_UNLOCK(p);
|
||||
|
||||
/*
|
||||
* This list is stable because all threads are now prevented from
|
||||
* running. The list is only modified in the context of a running
|
||||
* thread in this process.
|
||||
*/
|
||||
FOREACH_THREAD_IN_PROC(p, td)
|
||||
vm_thread_swapout(td);
|
||||
|
||||
PROC_LOCK(p);
|
||||
p->p_flag &= ~P_SWAPPINGOUT;
|
||||
p->p_swtick = ticks;
|
||||
return (0);
|
||||
}
|
122
sys/vm/vm_swapout_dummy.c
Normal file
122
sys/vm/vm_swapout_dummy.c
Normal file
@ -0,0 +1,122 @@
|
||||
/*-
|
||||
* Copyright (c) 1991 Regents of the University of California.
|
||||
* All rights reserved.
|
||||
* Copyright (c) 1994 John S. Dyson
|
||||
* All rights reserved.
|
||||
* Copyright (c) 1994 David Greenman
|
||||
* All rights reserved.
|
||||
* Copyright (c) 2005 Yahoo! Technologies Norway AS
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to Berkeley by
|
||||
* The Mach Operating System project at Carnegie-Mellon University.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)vm_pageout.c 7.4 (Berkeley) 5/7/91
|
||||
*
|
||||
*
|
||||
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
|
||||
*
|
||||
* Permission to use, copy, modify and distribute this software and
|
||||
* its documentation is hereby granted, provided that both the copyright
|
||||
* notice and this permission notice appear in all copies of the
|
||||
* software, derivative works or modified versions, and any portions
|
||||
* thereof, and that both notices appear in supporting documentation.
|
||||
*
|
||||
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
||||
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
||||
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
||||
*
|
||||
* Carnegie Mellon requests users of this software to return to
|
||||
*
|
||||
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
||||
* School of Computer Science
|
||||
* Carnegie Mellon University
|
||||
* Pittsburgh PA 15213-3890
|
||||
*
|
||||
* any improvements or extensions that they make and grant Carnegie the
|
||||
* rights to redistribute these changes.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/lock.h>
|
||||
#include <sys/mutex.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/sysctl.h>
|
||||
#include <sys/vmmeter.h>
|
||||
|
||||
#include <vm/vm.h>
|
||||
#include <vm/vm_param.h>
|
||||
#include <vm/vm_pageout.h>
|
||||
|
||||
static int vm_swap_enabled = 0;
|
||||
SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swap_enabled, CTLFLAG_RD,
|
||||
&vm_swap_enabled, 0,
|
||||
"Enable entire process swapout");
|
||||
|
||||
static int vm_swap_idle_enabled = 0;
|
||||
SYSCTL_INT(_vm, OID_AUTO, swap_idle_enabled, CTLFLAG_RD,
|
||||
&vm_swap_idle_enabled, 0,
|
||||
"Allow swapout on idle criteria");
|
||||
|
||||
void
|
||||
vm_swapout_run(void)
|
||||
{
|
||||
}
|
||||
|
||||
void
|
||||
vm_swapout_run_idle(void)
|
||||
{
|
||||
}
|
||||
|
||||
void
|
||||
faultin(struct proc *p)
|
||||
{
|
||||
|
||||
PROC_LOCK_ASSERT(p, MA_OWNED);
|
||||
if ((p->p_flag & P_INMEM) == 0)
|
||||
panic("faultin: proc %p swapped out with NO_SWAPPING", p);
|
||||
}
|
||||
|
||||
void
|
||||
swapper(void)
|
||||
{
|
||||
|
||||
for (;;)
|
||||
tsleep(&proc0, PVM, "swapin", MAXSLP * hz);
|
||||
}
|
Loading…
Reference in New Issue
Block a user