linux-kernel - Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped pages from reclaim

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Message-ID: <4A09D957.2070908@redhat.com>
Date:	Tue, 12 May 2009 16:17:27 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped
 pages from reclaim

Christoph Lameter wrote:
> On Tue, 12 May 2009, Rik van Riel wrote:
> 
>>> Streaming I/O means access once?
>> Yeah, "used-once pages" would be a better criteria, since
>> you could go through a gigantic set of used-once pages without
>> doing linear IO.
> 
> Can we see some load for which this patch has a beneficial effect?
> With some numbers?

How many do you want before you're satisfied that this
benefits a significant number of workloads?

How many numbers do you want to feel safe that no workloads
suffer badly from this patch?

Also, wow would you measure a concept as nebulous as desktop
interactivity?

Btw, the patch has gone into the Fedora kernel RPM to get
a good amount of user testing.  I'll let you know what the
users say (if anything).

-- 
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