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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


  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

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