lkml.org 
[lkml]   [2009]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH mmotm] vmscan: handle may_swap more strictly (Re: [PATCH mmotm] vmscan: fix may_swap handling for memcg)
Date
> Hi, KOSAKI.
>
> As you know, this problem caused by if condition(priority) in shrink_zone.
> Let me have a question.
>
> Why do we have to prevent scan value calculation when the priority is zero ?
> As I know, before split-lru, we didn't do it.
>
> Is there any specific issue in case of the priority is zero ?

Yes.

example:

get_scan_ratio() return anon:80%, file=20%. and the system have
10000 anon pages and 10000 file pages.

shrink_zone() picked up 8000 anon pages and 2000 file pages.
it mean 8000 file pages aren't scanned at all.

Oops, it can makes OOM-killer although system have droppable file cache.





\
 
 \ /
  Last update: 2009-06-09 10:01    [W:0.088 / U:2.252 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site