Changes to make the OOM killer much more effective:
- Allow the OOM killer to target processes currently locked in memory. These very often are the ones doing the memory hogging. - Drop the wakeup priority of processes currently sleeping while waiting for their page fault to complete. In order for the OOM killer to work well, the killed process and other system processes waiting on memory must be allowed to wakeup first. Reviewed by: dillon MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=90935
@ -347,7 +347,7 @@ RetryFault:;
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if ((queue - fs.m->pc) == PQ_CACHE && vm_page_count_severe()) {
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vm_page_activate(fs.m);
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unlock_and_deallocate(&fs);
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VM_WAIT;
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VM_WAITPFAULT;
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goto RetryFault;
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}
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@ -388,7 +388,7 @@ RetryFault:;
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}
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if (fs.m == NULL) {
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unlock_and_deallocate(&fs);
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VM_WAIT;
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VM_WAITPFAULT;
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goto RetryFault;
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}
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}
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@ -967,6 +967,7 @@ vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int page_req)
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* vm_wait: (also see VM_WAIT macro)
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*
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* Block until free pages are available for allocation
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* - Called in various places before memory allocations.
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*/
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void
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@ -988,6 +989,28 @@ vm_wait(void)
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splx(s);
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}
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/*
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* vm_waitpfault: (also see VM_WAITPFAULT macro)
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*
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* Block until free pages are available for allocation
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* - Called only in vm_fault so that processes page faulting
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* can be easily tracked.
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*/
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void
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vm_waitpfault(void)
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{
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int s;
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s = splvm();
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if (!vm_pages_needed) {
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vm_pages_needed = 1;
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wakeup(&vm_pages_needed);
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}
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tsleep(&cnt.v_free_count, PUSER, "pfault", 0);
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splx(s);
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}
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/*
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* vm_page_activate:
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*
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@ -1141,8 +1141,7 @@ vm_pageout_scan(int pass)
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/*
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* if this is a system process, skip it
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*/
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if ((p->p_flag & P_SYSTEM) || (p->p_lock > 0) ||
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(p->p_pid == 1) ||
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if ((p->p_flag & P_SYSTEM) || (p->p_pid == 1) ||
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((p->p_pid < 48) && (vm_swap_size != 0))) {
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PROC_UNLOCK(p);
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continue;
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@ -100,7 +100,9 @@ extern int vm_pageout_deficit;
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extern void pagedaemon_wakeup __P((void));
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#define VM_WAIT vm_wait()
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#define VM_WAITPFAULT vm_waitpfault()
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extern void vm_wait __P((void));
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extern void vm_waitpfault __P((void));
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#ifdef _KERNEL
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void vm_pageout_page __P((vm_page_t, vm_object_t));
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