linux-kernel - Re: [RFC][PATCH 1/2] Show quicklist at meminfo

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Message-Id: <20080822100049.F562.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 22 Aug 2008 10:05:45 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cl@...ux-foundation.org, tokunaga.keiich@...fujitsu.com
Subject: Re: [RFC][PATCH 1/2] Show quicklist at meminfo

> > quicklist_total_size() is racy against cpu hotplug.  That's OK for
> > /proc/meminfo purposes (occasional transient inaccuracy?), but will it
> > crash?  Not in the current implementation of per_cpu() afaict, but it
> > might crash if we ever teach cpu hotunplug to free up the percpu
> > resources.
> 
> First, Quicklist doesn't concern to cpu hotplug at all.
> it is another quicklist problem.
> 
> Next, I think it doesn't cause crash. but I haven't any test.
> So, I'll test cpu hotplug/unplug testing today.
> 
> I'll report result tommorow.

OK.
I ran cpu hotplug/unplug coutinuous workload over 12H.
then, system crash doesn't happend.

So, I believe my patch is cpu unplug safe.


test method
--------------------------------------------------------------
1. open 7 terminal and following script run on each console.

CPU=cpuXXX; while true; do echo 0 > /sys/devices/system/cpu/$CPU/online; echo 1 > /sys/devi
ces/system/cpu/$CPU/online;done

2. open another console, following command run.

watch -n 1 cat /proc/meminfo



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