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authorMichal Hocko <mhocko@suse.com>2016-05-23 16:25:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-23 17:04:14 -0700
commit9fbeb5ab59a2b2a09cca2eb68283e7a090d4b98d (patch)
treeb4f3ff77c420bdafd5be3aa8293320ad4cb871e4 /mm/internal.h
parentdc0ef0df7b6a90892ec41933212ac701152a254c (diff)
downloadlwn-9fbeb5ab59a2b2a09cca2eb68283e7a090d4b98d.tar.gz
lwn-9fbeb5ab59a2b2a09cca2eb68283e7a090d4b98d.zip
mm: make vm_mmap killable
All the callers of vm_mmap seem to check for the failure already and bail out in one way or another on the error which means that we can change it to use killable version of vm_mmap_pgoff and return -EINTR if the current task gets killed while waiting for mmap_sem. This also means that vm_mmap_pgoff can be killable by default and drop the additional parameter. This will help in the OOM conditions when the oom victim might be stuck waiting for the mmap_sem for write which in turn can block oom_reaper which relies on the mmap_sem for read to make a forward progress and reclaim the address space of the victim. Please note that load_elf_binary is ignoring vm_mmap error for current->personality & MMAP_PAGE_ZERO case but that shouldn't be a problem because the address is not used anywhere and we never return to the userspace if we got killed. Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/internal.h b/mm/internal.h
index bff7fd702331..a37e5b6f9d25 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -444,8 +444,7 @@ extern u32 hwpoison_filter_enable;
extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
unsigned long, unsigned long,
- unsigned long, unsigned long,
- bool);
+ unsigned long, unsigned long);
extern void set_pageblock_order(void);
unsigned long reclaim_clean_pages_from_list(struct zone *zone,