linux-kernel - Re: [PATCH v3]mm/oom-kill: direct hardware access processes should get bonus

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Message-Id: <20110104172833.1ff20b41.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 4 Jan 2011 17:28:33 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Figo.zhang" <figo1802@...il.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH v3]mm/oom-kill: direct hardware access processes should
 get bonus

On Tue, 04 Jan 2011 15:51:44 +0800
"Figo.zhang" <zhangtianfei@...dcoretech.com> wrote:

> 
> i had send the patch to protect the hardware access processes for 
> oom-killer before, but rientjes have not agree with me.
> 
> but today i catch log from my desktop. oom-killer have kill my "minicom" 
> and "Xorg". so i think it should add protection about it.
> 

Off topic.

In this log, I found

> > Jan  4 15:22:55 figo-desktop kernel: Free swap  = -1636kB
> > Jan  4 15:22:55 figo-desktop kernel: Total swap = 0kB
> > Jan  4 15:22:55 figo-desktop kernel: 515070 pages RAM

... This means total_swap_pages = 0 while pages are read-in at swapoff.

Let's see 'points' for oom 
==
points = (get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS)) * 1000 /
                        totalpages;
==

Here, totalpages = total_ram + total_swap but totalswap is 0 here.

So, points can be > 1000, easily.
(This seems not to be related to the Xorg's death itself)



Thanks,
-Kame

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