linux-kernel - Re: [PATCH]vmscan: handle underflow for get_scan

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Message-ID: <20100406012206.GD5295@localhost>
Date:	Tue, 6 Apr 2010 09:22:07 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH]vmscan: handle underflow for get_scan_ratio

> ===================================================================
> >From 52358cbccdfe94e0381974cd6e937bcc6b1c608b Mon Sep 17 00:00:00 2001
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Date: Fri, 2 Apr 2010 17:13:48 +0900
> Subject: [PATCH] Revert "vmscan: get_scan_ratio() cleanup"
> 
> Shaohua Li reported his tmpfs streaming I/O test can lead to make oom.
> The test uses a 6G tmpfs in a system with 3G memory. In the tmpfs,
> there are 6 copies of kernel source and the test does kbuild for each
> copy. His investigation shows the test has a lot of rotated anon
> pages and quite few file pages, so get_scan_ratio calculates percent[0]
> (i.e. scanning percent for anon)  to be zero. Actually the percent[0]
> shoule be a big value, but our calculation round it to zero.

  should      small :)

Acked-by: Wu Fengguang <fengguang.wu@...el.com>

Thanks,
Fengguang
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