From: Simon Kirby <sim@hostway.ca>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Slow snapshot deletion
Date: Fri, 12 Aug 2011 11:26:11 -0700 [thread overview]
Message-ID: <20110812182611.GB11997@hostway.ca> (raw)
In-Reply-To: <20110812182144.GA10102@untroubled.org>
On Fri, Aug 12, 2011 at 12:21:44PM -0600, Bruce Guenter wrote:
> On Thu, Aug 11, 2011 at 05:40:36PM -0700, Simon Kirby wrote:
> > By chance, does "vmstat 1" or top show a high system cpu% while this is
> > happening,
>
> Absolutely, usually around 80-90%
...which is perhaps why you had difficult obtaining traces with sysrq-w,
since most of the time there were no D-state processes. Instead, sysrq-l
give a backtrace of each running CPU.
> > and if so, does cat /proc/<pid>/stack of the PIDs in R state
> > sometimes show things under btrfs_run_delayed_refs like
> > setup_cluster_no_bitmap() and rb_next()?
>
> No, I am not seeing what you describe. The stack traces are usually
> showing what I originally quoted. I don't know if I've seen
> setup_cluster_no_bitmap or rb_* at all.
Ok, oh well. :)
Simon-
next prev parent reply other threads:[~2011-08-12 18:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-28 20:04 Slow snapshot deletion Bruce Guenter
2011-07-28 20:28 ` Chris Mason
2011-07-28 20:51 ` Chris Mason
2011-08-04 16:35 ` Bruce Guenter
2011-08-11 15:04 ` Bruce Guenter
2011-08-12 0:40 ` Simon Kirby
2011-08-12 18:21 ` Bruce Guenter
2011-08-12 18:26 ` Simon Kirby [this message]
2011-08-01 22:26 ` Bruce Guenter
2011-08-01 22:41 ` cwillu
2011-08-01 22:59 ` Bruce Guenter
2011-08-02 0:29 ` Chris Mason
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