linux-kernel - Re: 2.6.28-rc8 big regression in VM

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Message-Id: <20081215193305.06C4.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Mon, 15 Dec 2008 19:56:57 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	kosaki.motohiro@...fujitsu.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: 2.6.28-rc8 big regression in VM

> On Mon, Dec 15, 2008 at 11:05:24AM +0900, KOSAKI Motohiro wrote:
> > I also don't reproduce your problem.
> > Could you get output of "cat /proc/meminfo", not only free command?
> 
> attached meminfo and vmstat after dropping caches.


MemTotal:        2016688 kB
MemFree:         1528748 kB
Buffers:             424 kB
Cached:           140060 kB
SwapCached:            0 kB
Active(anon):     329884 kB
Inactive(anon):        4 kB
Active(file):      23368 kB
Inactive(file):    47328 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       1542232 kB
SwapFree:        1542232 kB
Dirty:                64 kB
Writeback:             0 kB
AnonPages:        260100 kB
Mapped:            85036 kB


Usually, Cached - tmpfs ~= Active(file) + Inactive(file).
tmpfs file isn't droppable.

We should see Active(file) + Inactive(file) (= 70696kB) instead Cached.
In addition, drop_cache sysctl can't drop Mapped memory.

Then, this value isn't so wonder value, IMHO.




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