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authorNick Piggin <npiggin@suse.de>2009-01-06 17:38:59 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 18:58:58 -0500
commit1c0fe6e3bda0464728c23c8d84aa47567e8b716c (patch)
tree64f7903ee7757b14464e8a06bf91f5c4d5a8ba56 /include/linux/mm.h
parent5bd1455c239672081d0e7f086e899b8cbc7a9844 (diff)
mm: invoke oom-killer from page fault
Rather than have the pagefault handler kill a process directly if it gets a VM_FAULT_OOM, have it call into the OOM killer. With increasingly sophisticated oom behaviour (cpusets, memory cgroups, oom killing throttling, oom priority adjustment or selective disabling, panic on oom, etc), it's silly to unconditionally kill the faulting process at page fault time. Create a hook for pagefault oom path to call into instead. Only converted x86 and uml so far. [akpm@linux-foundation.org: make __out_of_memory() static] [akpm@linux-foundation.org: fix comment] Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Jeff Dike <jdike@addtoit.com> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index aaa8b843be28..4a3d28c86443 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -717,6 +717,11 @@ static inline int page_mapped(struct page *page)
717 717
718#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS) 718#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS)
719 719
720/*
721 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
722 */
723extern void pagefault_out_of_memory(void);
724
720#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) 725#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
721 726
722extern void show_free_areas(void); 727extern void show_free_areas(void);