On Wed, Aug 16, 2017 at 03:23:29PM +0200, Michal Hocko wrote:
> Reviewed-by: Michal Hocko <mhocko@xxxxxxxx>
Thanks for the review!
There's this further possible microoptimization that can be folded on top.
>From 76bf017f923581d15fe01249af92b0d757752a9f Mon Sep 17 00:00:00 2001
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Date: Thu, 17 Aug 2017 18:39:46 +0200
Subject: [PATCH 1/1] mm: oom: let oom_reap_task and exit_mmap run
concurrently, add unlikely
Microoptimization to fold before merging.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 013170e5c8a4..ab0026a8acc4 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3003,7 +3003,7 @@ void exit_mmap(struct mm_struct *mm)
unmap_vmas(&tlb, vma, 0, -1);
set_bit(MMF_OOM_SKIP, &mm->flags);
- if (tsk_is_oom_victim(current)) {
+ if (unlikely(tsk_is_oom_victim(current))) {
/*
* Wait for oom_reap_task() to stop working on this
* mm. Because MMF_OOM_SKIP is already set before
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