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Modify vm_page_grab_pages() to handle VM_ALLOC_NOWAIT.

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This will allow its use in sendfile_swapin().

Reviewed by:	alc, kib
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D11942
This commit is contained in:
Mark Johnston 2017-08-11 16:29:22 +00:00
parent 6921451dab
commit 9df950b35d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322405
5 changed files with 16 additions and 9 deletions
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2
sys/kern/vfs_bio.c
View File

@ -2746,7 +2746,7 @@ vfs_vmio_extend(struct buf *bp, int desiredpages, int size)
* deadlocks once allocbuf() is called after
* pages are vfs_busy_pages().
*/
vm_page_grab_pages(obj,
(void)vm_page_grab_pages(obj,
OFF_TO_IDX(bp->b_offset) + bp->b_npages,
VM_ALLOC_SYSTEM | VM_ALLOC_IGN_SBUSY |
VM_ALLOC_NOBUSY | VM_ALLOC_WIRED,

2
sys/sparc64/sparc64/pmap.c
View File

@ -1248,7 +1248,7 @@ pmap_pinit(pmap_t pm)
CPU_ZERO(&pm->pm_active);
VM_OBJECT_WLOCK(pm->pm_tsb_obj);
vm_page_grab_pages(pm->pm_tsb_obj, 0, VM_ALLOC_NORMAL |
(void)vm_page_grab_pages(pm->pm_tsb_obj, 0, VM_ALLOC_NORMAL |
VM_ALLOC_NOBUSY | VM_ALLOC_WIRED | VM_ALLOC_ZERO, ma, TSB_PAGES);
VM_OBJECT_WUNLOCK(pm->pm_tsb_obj);
for (i = 0; i < TSB_PAGES; i++)

4
sys/vm/vm_glue.c
View File

@ -391,7 +391,7 @@ vm_thread_new(struct thread *td, int pages)
* page of stack.
*/
VM_OBJECT_WLOCK(ksobj);
vm_page_grab_pages(ksobj, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY |
(void)vm_page_grab_pages(ksobj, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY |
VM_ALLOC_WIRED, ma, pages);
for (i = 0; i < pages; i++)
ma[i]->valid = VM_PAGE_BITS_ALL;
@ -568,7 +568,7 @@ vm_thread_swapin(struct thread *td)
pages = td->td_kstack_pages;
ksobj = td->td_kstack_obj;
VM_OBJECT_WLOCK(ksobj);
vm_page_grab_pages(ksobj, 0, VM_ALLOC_NORMAL | VM_ALLOC_WIRED, ma,
(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;

13
sys/vm/vm_page.c
View File

@ -3173,13 +3173,15 @@ vm_page_grab(vm_object_t object, vm_pindex_t pindex, int allocflags)
* optional allocation flags:
* VM_ALLOC_IGN_SBUSY do not sleep on soft busy pages
* VM_ALLOC_NOBUSY do not exclusive busy the page
* VM_ALLOC_NOWAIT do not sleep
* VM_ALLOC_SBUSY set page to sbusy state
* VM_ALLOC_WIRED wire the pages
* VM_ALLOC_ZERO zero and validate any invalid pages
*
* This routine may sleep.
* If VM_ALLOC_NOWAIT is not specified, this routine may sleep. Otherwise, it
* may return a partial prefix of the requested range.
*/
void
int
vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
vm_page_t *ma, int count)
{
@ -3197,7 +3199,7 @@ vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
(allocflags & VM_ALLOC_IGN_SBUSY) != 0,
("vm_page_grab_pages: VM_ALLOC_SBUSY/IGN_SBUSY mismatch"));
if (count == 0)
return;
return (0);
i = 0;
retrylookup:
m = vm_page_lookup(object, pindex + i);
@ -3206,6 +3208,8 @@ vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
sleep = (allocflags & VM_ALLOC_IGN_SBUSY) != 0 ?
vm_page_xbusied(m) : vm_page_busied(m);
if (sleep) {
if ((allocflags & VM_ALLOC_NOWAIT) != 0)
break;
/*
* Reference the page before unlocking and
* sleeping so that the page daemon is less
@ -3233,6 +3237,8 @@ vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
m = vm_page_alloc(object, pindex + i, (allocflags &
~VM_ALLOC_IGN_SBUSY) | VM_ALLOC_COUNT(count - i));
if (m == NULL) {
if ((allocflags & VM_ALLOC_NOWAIT) != 0)
break;
VM_OBJECT_WUNLOCK(object);
VM_WAIT;
VM_OBJECT_WLOCK(object);
@ -3247,6 +3253,7 @@ vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
ma[i] = m;
m = vm_page_next(m);
}
return (i);
}
/*

4
sys/vm/vm_page.h
View File

@ -419,7 +419,7 @@ vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
#define VM_ALLOC_IGN_SBUSY 0x1000 /* (gp) Ignore shared busy flag */
#define VM_ALLOC_NODUMP 0x2000 /* (ag) don't include in dump */
#define VM_ALLOC_SBUSY 0x4000 /* (acgp) Shared busy the page */
#define VM_ALLOC_NOWAIT 0x8000 /* (g) Do not sleep, return NULL */
#define VM_ALLOC_NOWAIT 0x8000 /* (gp) Do not sleep */
#define VM_ALLOC_COUNT_SHIFT 16
#define VM_ALLOC_COUNT(count) ((count) << VM_ALLOC_COUNT_SHIFT)
@ -470,7 +470,7 @@ vm_page_t vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req,
vm_paddr_t boundary, vm_memattr_t memattr);
vm_page_t vm_page_alloc_freelist(int, int);
vm_page_t vm_page_grab (vm_object_t, vm_pindex_t, int);
void vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
int vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
vm_page_t *ma, int count);
int vm_page_try_to_free (vm_page_t);
void vm_page_deactivate (vm_page_t);