linux-kernel - Re: backing up ext4 fs, system unresponsive, thrashing like crazy even though swap is unused

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Date:	Mon, 3 Dec 2012 22:00:06 +0200 (EET)
From:	Dimitrios Apostolou <jimis@....net>
To:	Eric Paris <eparis@...isplace.org>, Theodore Ts'o <tytso@....edu>
cc:	Roland Eggner <edvx1@...temanalysen.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: backing up ext4 fs, system unresponsive, thrashing like crazy
 even though swap is unused

On Mon, 3 Dec 2012, Dimitrios Apostolou wrote:
>
> I've managed to reproduce the scenario with concurrent "du" commands running 
> on the filesystems. I'll try doing it once more, but it may take a while to 
> get the dmesg/slabinfo etc output, since even a realtime root shell is 
> non-responsive for many minutes.
>
> What other debug output do you suggest to get, to find out why ext4 inodes 
> are pinned?

Important detail: one of the filesystems contains *huge* maildirs, 
containing hundreds of thousands of messages.


Dimitris

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