linux-kernel - Re: [PATCH] vmscan: evict use-once pages first (v3)

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Message-Id: <20090430093733.D20C.A69D9226@jp.fujitsu.com>
Date:	Thu, 30 Apr 2009 09:39:38 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Peter Zijlstra <peterz@...radead.org>,
	Elladan <elladan@...imo.com>, linux-kernel@...r.kernel.org,
	tytso@....edu, linux-mm@...ck.org
Subject: Re: [PATCH] vmscan: evict use-once pages first (v3)

> When the file LRU lists are dominated by streaming IO pages,
> evict those pages first, before considering evicting other
> pages.
> 
> This should be safe from deadlocks or performance problems
> because only three things can happen to an inactive file page:
> 1) referenced twice and promoted to the active list
> 2) evicted by the pageout code
> 3) under IO, after which it will get evicted or promoted
> 
> The pages freed in this way can either be reused for streaming
> IO, or allocated for something else. If the pages are used for
> streaming IO, this pageout pattern continues. Otherwise, we will
> fall back to the normal pageout pattern.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>
> 
> ---
> On Thu, 30 Apr 2009 01:07:51 +0900
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> 
> > we handle active_anon vs inactive_anon ratio by shrink_list().
> > Why do you insert this logic insert shrink_zone() ?
> 
> Kosaki, this implementation mirrors the anon side of things precisely.
> Does this look good?
> 
> Elladan, this patch should work just like the second version. Please
> let me know how it works for you.

Looks good to me. thanks.
but I don't hit Rik's explained issue, I hope Elladan report his test result.



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