linux-kernel - Re: [PATCH 2.6.20-rc5 1/1] MM: enhance Linux swap subsystem

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Message-ID: <4df04b840702221831x76626de1rfa70cb653b12f495@mail.gmail.com>
Date:	Fri, 23 Feb 2007 10:31:13 +0800
From:	"yunfeng zhang" <zyf.zeroos@...il.com>
To:	"Rik van Riel" <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, "Hugh Dickins" <hugh@...itas.com>,
	linux-mm@...ck.org
Subject: Re: [PATCH 2.6.20-rc5 1/1] MM: enhance Linux swap subsystem

Performance improvement should occur when private pages of multiple processes
are messed up, such as SMP. To UP, my previous mail is done by timer, which only
shows a fact, if pages are messed up fully, current readahead will degrade
remarkably, and unused readaheading pages make a burden to memory subsystem.

You should re-test your testcases following the advises on Linux without my
patch, do normal testcases and select a testcase randomly and record
'/proc/vmstat/pswpin', redo the testcase solely, if the results are close, that
is, your testcases doesn't messed up private pages at all as you expected due to
Linux schedule. Thank you!

2007/2/22, Rik van Riel <riel@...hat.com>:
> yunfeng zhang wrote:
> > Any comments or suggestions are always welcomed.
>
> Same question as always: what problem are you trying to solve?
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