Re: [PATCH v3]mm/oom-kill: direct hardware access processes shouldget bonus

From: Figo.zhang
Date: Tue Jan 04 2011 - 03:58:29 EST

On 01/04/2011 04:28 PM, KAMEZAWA Hiroyuki wrote:
On Tue, 04 Jan 2011 15:51:44 +0800
"Figo.zhang"<zhangtianfei@xxxxxxxxxxxxxxxx> 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 /

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,

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

so points canot larger than 1000.


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