From: Marc Cousin <cousinmarc@gmail.com>
To: dsterba@suse.cz, linux-btrfs@vger.kernel.org
Subject: Re: snapshot destruction making IO extremely slow
Date: Thu, 23 Apr 2015 17:42:39 +0200 [thread overview]
Message-ID: <553912EF.7010004@gmail.com> (raw)
In-Reply-To: <5534CC2F.4080109@gmail.com>
On 20/04/2015 11:51, Marc Cousin wrote:
> On 31/03/2015 19:05, David Sterba wrote:
>> 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.
>>
>
> Sorry, it took me a while to reproduce this (I needed to be in front of the machine when it happens :) )
Hi,
Anything more I can provide on this issue ?
Regards
next prev parent reply other threads:[~2015-04-23 15:42 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
2015-04-20 9:51 ` Marc Cousin
2015-04-23 15:42 ` Marc Cousin [this message]
2017-05-24 8:10 ` Marc Cousin
2017-05-24 8:23 ` Marat Khalili
2017-06-05 8:30 ` Jakob Schürz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=553912EF.7010004@gmail.com \
--to=cousinmarc@gmail.com \
--cc=dsterba@suse.cz \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).