linux-kernel - [PATCH] mm, oom: normalize the adj to ensure oom

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Date:	Mon, 3 Mar 2014 08:24:22 +0000
From:	"He, Bo" <bo.he@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>
CC:	"yanmin_zhang@...el.linux.com" <yanmin_zhang@...el.linux.com>,
	"Wang, Biao" <biao.wang@...el.com>
Subject: [PATCH]  mm, oom: normalize the adj to ensure oom_badness return
 one 

if oom_score_adj is a big negative number, such as -941,
adj *= totalpages / 1000 will be a big negative number, 
finally the oom_badness will get 0 points, here normalize 
the oom_score_adj to ensure oom_badness return the
positive number.

Change-Id: I1c56a948ce48b65a1bb63b56ffef07d5d76d7ec8
Signed-off-by: he, bo <bo.he@...el.com>
Signed-off-by: wang, biao <biao.wang@...el.com>
Reviewed-by: Yanmin Zhang <yanmin_zhang@...el.com>
---
 mm/oom_kill.c |    3 +++ 
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 3291e82..5a93986 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -181,6 +181,9 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
        points -= (points * 3) / 100;
 
    /* Normalize to oom_score_adj units */
+   if(OOM_SCORE_ADJ_MIN < 0)
+       adj -= OOM_SCORE_ADJ_MIN;
+
    adj *= totalpages / 1000;
    points += adj;
 
-- 
1.7.6


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