linux-kernel - Re: [PATCH 2/3] Reclaim invalidated page ASAP

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Message-ID: <87zksqeway.fsf@gmail.com>
Date:	Tue, 30 Nov 2010 09:11:01 -0500
From:	Ben Gamari <bgamari.foss@...il.com>
To:	Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>
Subject: Re: [PATCH 2/3] Reclaim invalidated page ASAP

On Tue, 30 Nov 2010 09:18:22 +0000, Mel Gorman <mel@....ul.ie> wrote:
> I would agree except as said elsewhere, it's a chicken and egg problem.
> We don't have a real world test because fadvise is not useful in its
> current iteration. I'm hoping that there will be a test comparing
> 
> rsync		on vanilla kernel
> rsync		on patched kernel
> rsync+patch	on vanilla kernel
> rsync+patch	on patched kernel
> 
> Are the results of such a test likely to happen?
> 
Yes, absolutely, although I'm sorry it has taken so long. Between
thanksgiving and the impending end of the semester things have been a
bit hectic. Nevertheless, I just finished putting together a script to
record some metics from /proc/vmstat and /proc/[pid]/statm, so at this
point I'm ready to finally take some data. Any suggestions for
particular patterns to look for in the numbers or other metrics to
record are welcome. Cheers,

- Ben
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