From: Pavel Machek <pavel@ucw.cz>
To: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: linux-kernel@vger.kernel.org, linux-mm@vger.kernel.org
Subject: Re: swapping when there's a free memory
Date: Sun, 25 Apr 2010 09:13:49 +0200 [thread overview]
Message-ID: <20100425071349.GA1275@ucw.cz> (raw)
In-Reply-To: <alpine.DEB.1.10.1004220248280.19246@artax.karlin.mff.cuni.cz>
Hi!
> I captured this output of vmstat. The machine was freeing cache and
> swapping out pages even when there was a plenty of free memory.
>
> The machine is sparc64 with 1GB RAM with 2.6.34-rc4. This abnormal
> swapping happened during running spadfsck --- a fsck program for a custom
> filesystem that caches most reads in its internal cache --- so it reads
> buffers and allocates memory at the same time.
>
> Note that sparc64 doesn't have any low/high memory zones, so it couldn't
> be explained by filling one zone and needing to allocate pages in it.
Fragmented memory + high-order allocation?
> This abnormal behavior doesn't happen everytime, it happend about twice
> for many spadfsck attempts.
...yep, that would be random.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2010-04-25 7:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 0:55 swapping when there's a free memory Mikulas Patocka
2010-04-25 7:13 ` Pavel Machek [this message]
2010-04-26 22:33 ` Andrew Morton
2010-04-27 1:35 ` KAMEZAWA Hiroyuki
2010-04-30 3:52 ` Mikulas Patocka
2010-04-26 22:31 ` Andrew Morton
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