[PATCH 08/18] mm, fork: make dup_mmap wait for mmap_sem for write killable

From: Michal Hocko
Date: Mon Feb 29 2016 - 08:27:34 EST

From: Michal Hocko <mhocko@xxxxxxxx>

dup_mmap needs to lock current's mm mmap_sem for write. If the waiting
task gets killed by the oom killer it would block oom_reaper from
asynchronous address space reclaim and reduce the chances of timely OOM
resolving. Wait for the lock in the killable mode and return with EINTR
if the task got killed while waiting.

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
kernel/fork.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index d277e83ed3e0..e064bc8453dc 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -413,7 +413,10 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
unsigned long charge;

- down_write(&oldmm->mmap_sem);
+ if (down_write_killable(&oldmm->mmap_sem)) {
+ uprobe_end_dup_mmap();
+ return -EINTR;
+ }
uprobe_dup_mmap(oldmm, mm);