linux-kernel - Re: [PATCH] mm: evict streaming IO cache first

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Date:	Mon, 17 Nov 2008 15:54:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	"Gene Heskett" <gene.heskett@...il.com>
Subject: Re: [PATCH] mm: evict streaming IO cache first

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