diff options
| author | Michal Hocko <mhocko@suse.com> | 2016-05-24 01:25:42 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-24 02:04:14 +0200 |
| commit | 2d6c928241add2848e4eebfce407e95164229976 (patch) | |
| tree | 61c481b880208893ab3a5386aca9608151174472 /mm/mmap.c | |
| parent | mm, elf: handle vm_brk error (diff) | |
| download | linux-2d6c928241add2848e4eebfce407e95164229976.tar.xz linux-2d6c928241add2848e4eebfce407e95164229976.zip | |
mm: make vm_brk killable
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 <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index ca292a7c2b68..d3d9a94ca031 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -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); |