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

[Figo.zhang]

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 /
>                          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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