From: Christoph Hellwig <hch@infradead.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jan Kara <jack@suse.cz>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"bugzilla-daemon@bugzilla.kernel.org"
<bugzilla-daemon@bugzilla.kernel.org>,
"daaugusto@gmail.com" <daaugusto@gmail.com>,
"kernel-bugzilla@cygnusx-1.org" <kernel-bugzilla@cygnusx-1.org>,
"listposter@gmail.com" <listposter@gmail.com>,
"justincase@yopmail.com" <justincase@yopmail.com>,
"clopez@igalia.com" <clopez@igalia.com>
Subject: Re: [Bug 18632] "INFO: task" dpkg "blocked for more than 120 seconds.
Date: Thu, 9 Jun 2011 07:02:14 -0400 [thread overview]
Message-ID: <20110609110214.GA9017@infradead.org> (raw)
In-Reply-To: <20110609090906.GA19186@localhost>
On Thu, Jun 09, 2011 at 05:09:06PM +0800, Wu Fengguang wrote:
> I have a sync livelock test script and it sometimes livelocked on XFS
> even with the livelock fix patches. Ext4 is always OK.
This sounds similar to the cfq issue just posted to lkml as
"CFQ: async queue blocks the whole system".
Does this happen with non-CFQ I/O schedulers, too?
> [ 3581.185120] [<ffffffff812ed520>] xfs_ioend_wait+0x87/0x9f
This waits for the I/O completion to actually arrive - something that
XFS does correctly in both sync and fsync, but ext4 only does for fsync.
It might have some issues in the way it's implemented, I'll look if
we can do something. But I suspect cfq delaying async writes too much
is definitively going to cause issues for us here.
next prev parent reply other threads:[~2011-06-09 11:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-18632-27@https.bugzilla.kernel.org/>
[not found] ` <201106082138.p58Lchgj002615@demeter2.kernel.org>
[not found] ` <20110608150241.8412a63d.akpm@linux-foundation.org>
2011-06-09 3:32 ` [Bug 18632] "INFO: task" dpkg "blocked for more than 120 seconds Wu Fengguang
2011-06-09 3:54 ` Wu Fengguang
2011-06-09 8:27 ` Christoph Hellwig
2011-06-09 9:09 ` Wu Fengguang
2011-06-09 11:02 ` Christoph Hellwig [this message]
2011-06-09 12:11 ` Wu Fengguang
2011-06-09 12:17 ` Wu Fengguang
2011-06-09 12:17 ` Christoph Hellwig
2011-06-09 12:43 ` Wu Fengguang
2011-06-09 13:23 ` Christoph Hellwig
2011-06-10 3:21 ` Wu Fengguang
2011-06-19 15:56 ` Christoph Hellwig
2011-06-19 16:33 ` Wu Fengguang
2011-06-09 13:56 ` Tao Ma
2011-06-09 14:12 ` Tao Ma
2011-06-09 14:21 ` Christoph Hellwig
2011-06-09 14:32 ` Vivek Goyal
2011-06-09 14:51 ` Tao Ma
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