From: David Sterba <dsterba@suse.cz>
To: Marc Cousin <cousinmarc@gmail.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: snapshot destruction making IO extremely slow
Date: Tue, 31 Mar 2015 19:05:16 +0200 [thread overview]
Message-ID: <20150331170516.GD6821@suse.cz> (raw)
In-Reply-To: <55196740.1000705@gmail.com>
On Mon, Mar 30, 2015 at 05:09:52PM +0200, Marc Cousin wrote:
> > So it would be good to sample the active threads and see where it's
> > spending the time. It could be the somewhere in the rb-tree representing
> > extents, but that's a guess.
> >
> I just need to be told how to do that :)
>
> Something like a perf top ?
for i in `pgrep btrfs`; do
ps $i
sudo cat /proc/$i/stack 2>/dev/null
done
and capture samples every second.
next prev parent reply other threads:[~2015-03-31 17:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-22 8:11 snapshot destruction making IO extremely slow Marc Cousin
2015-03-22 8:23 ` Marc Cousin
2015-03-25 1:19 ` David Sterba
2015-03-25 10:55 ` Marc Cousin
2015-03-25 11:38 ` Rich Freeman
2015-03-30 14:30 ` David Sterba
2015-03-30 14:25 ` David Sterba
2015-03-30 15:09 ` Marc Cousin
2015-03-31 17:05 ` David Sterba [this message]
2015-04-20 9:51 ` Marc Cousin
2015-04-23 15:42 ` Marc Cousin
2017-05-24 8:10 ` Marc Cousin
2017-05-24 8:23 ` Marat Khalili
2017-06-05 8:30 ` Jakob Schürz
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