linux-kernel - [PATCH]oom-kill: direct hardware access processes should get bonus

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Date:	Tue, 02 Nov 2010 09:43:33 +0800
From:	"Figo.zhang" <figo1802@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...l.org>,
	"rientjes@...gle.com" <rientjes@...gle.com>
Subject: [PATCH]oom-kill: direct hardware access processes should get bonus


the victim should not directly access hardware devices like Xorg server,
because the hardware could be left in an unpredictable state, although 
user-application can set /proc/pid/oom_score_adj to protect it. so i think
those processes should get 3% bonus for protection.

Signed-off-by: Figo.zhang <figo1802@...il.com>
---
mm/oom_kill.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 4029583..df6a9da 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -195,10 +195,12 @@ unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
 	task_unlock(p);
 
 	/*
-	 * Root processes get 3% bonus, just like the __vm_enough_memory()
-	 * implementation used by LSMs.
+	 * Root and direct hardware access processes get 3% bonus, just like the
+	 * __vm_enough_memory() implementation used by LSMs.
 	 */
-	if (has_capability_noaudit(p, CAP_SYS_ADMIN))
+	if (has_capability_noaudit(p, CAP_SYS_ADMIN) ||
+	    has_capability_noaudit(p, CAP_SYS_RESOURCE) ||
+	    has_capability_noaudit(p, CAP_SYS_RAWIO))
 		points -= 30;
 
 	/*


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