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mm: make vm_brk killable

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Now that all the callers handle vm_brk failure we can change it wait for
mmap_sem killable to help oom_reaper to not get blocked just because
vm_brk gets blocked behind mmap_sem readers.

Signed-off-by: Michal Hocko <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko 2016-05-23 16:25:42 -07:00 • committed by Linus Torvalds
commit 2d6c928241
2 changed files with 4 additions and 7 deletions
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9
mm/mmap.c
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@ -2712,12 +2712,9 @@ unsigned long vm_brk(unsigned long addr, unsigned long len)
unsigned long ret;
bool populate;
/*
* XXX not all users are chcecking the return value, convert
* to down_write_killable after they are able to cope with
* error
*/
down_write(&mm->mmap_sem);
if (down_write_killable(&mm->mmap_sem))
return -EINTR;
ret = do_brk(addr, len);
populate = ((mm->def_flags & VM_LOCKED) != 0);
up_write(&mm->mmap_sem);