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

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Date:	Tue, 04 Jan 2011 16:56:47 +0800
From:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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 01/04/2011 04:28 PM, KAMEZAWA Hiroyuki wrote:
> 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)

total_swap is 0, so
totalpages = total_ram,
get_mm_counter(p->mm, MM_SWAPENTS) = 0,

so
points = (get_mm_rss(p->mm)) * 1000 / totalpages;

so points canot larger than 1000.




>
>
>
> Thanks,
> -Kame
>
>

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