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

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Date:	Tue, 12 May 2009 16:26:50 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
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

On Tue, 12 May 2009, Rik van Riel wrote:

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

One would be a good starter.

> 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?

Measure the response to desktop clicks? I.e. retrieve an URL with a
webbrowser that was running when the other load started.

> 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).

I have not seen a single reference to a measurement taken with this patch.

Maybe that is because I have not looked at the threads that discuss
measurements with this patch. Where are they?
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