Re: [PATCH] mm: evict streaming IO cache first

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Mon, 17 Nov 2008 15:39:20 +0900
"KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com> wrote:

> rewote by div to mul changing.
> 
> 
>                         file               recent scanned.
>   %file = IO_cost * ------------ * -------------
>                      anon + file       recent rotated.
> 
> 
Ah, sorry.

> > But when "files are used by streaming or some touch once application",
> > there is no rotation because they are in INACTIVE FILE at first add_to_lru().
> > But recent_rotated will not increase while recent_scanned goes bigger and bigger.
> 
> Yup.
> 
> > Then %file goes to 0 rapidly.
> 
> I think reverse.
> 
> The problem is, when streaming access started right after, recent
> scanned isn't so much.
> then %file don't reach 100%.
> 
> then, few anon pages swaped out althouth memory pressure isn't so heavy.
> 
"few" ? 
85Mbytes of used swap while 1.2GBytes of free memory in Gene Heskett's report.
Hmm..

How about resetting zone->recent_scanned/rotated to be some value calculated from
INACTIVE_ANON/INACTIVE_FILE at some time (when the system is enough idle) ?

Thanks,
-Kame



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