diff options
author | markj <markj@FreeBSD.org> | 2017-09-17 15:45:39 +0000 |
---|---|---|
committer | Luiz Souza <luiz@netgate.com> | 2018-02-21 15:13:54 -0300 |
commit | 62c6e695b6f7a2c5e540ea38aa90547f8b3923e8 (patch) | |
tree | 488f5917760714f28dac56faccc68e6bbd477dee /sys/vm | |
parent | ff6af41082b99173f1f3faea0b7f58d1f70384e9 (diff) | |
download | FreeBSD-src-62c6e695b6f7a2c5e540ea38aa90547f8b3923e8.zip FreeBSD-src-62c6e695b6f7a2c5e540ea38aa90547f8b3923e8.tar.gz |
MFC r322405, r322406:
Modify vm_page_grab_pages() to handle VM_ALLOC_NOWAIT, use it in
sendfile_swapin().
(cherry picked from commit 00ffd58e267b0466241a684db7dbfd7f2fecbf80)
Diffstat (limited to 'sys/vm')
-rw-r--r-- | sys/vm/vm_glue.c | 4 | ||||
-rw-r--r-- | sys/vm/vm_page.c | 13 | ||||
-rw-r--r-- | sys/vm/vm_page.h | 4 |
3 files changed, 14 insertions, 7 deletions
diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c index 0655f74..941e7e8 100644 --- a/sys/vm/vm_glue.c +++ b/sys/vm/vm_glue.c @@ -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; diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index 39df669..07f32f3 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -3147,13 +3147,15 @@ retrylookup: * 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) { @@ -3171,7 +3173,7 @@ 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); @@ -3180,6 +3182,8 @@ retrylookup: 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 @@ -3207,6 +3211,8 @@ retrylookup: 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); @@ -3221,6 +3227,7 @@ retrylookup: ma[i] = m; m = vm_page_next(m); } + return (i); } /* diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index e3df347..156da21 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -414,7 +414,7 @@ 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) @@ -454,7 +454,7 @@ vm_page_t vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req, vm_page_t vm_page_alloc_freelist(int, int); void vm_page_change_lock(vm_page_t m, struct mtx **mtx); 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); |