From: David Sterba <dsterba@suse.cz>
To: Josef Bacik <jbacik@fb.com>
Cc: Qu Wenruo <quwenruo.btrfs@gmx.com>,
Christian Rohmann <crohmann@netcologne.de>,
Qu Wenruo <quwenruo@cn.fujitsu.com>,
John Ettedgui <john.ettedgui@gmail.com>,
Austin S Hemmelgarn <ahferroin7@gmail.com>,
btrfs <linux-btrfs@vger.kernel.org>, Chris Mason <clm@fb.com>
Subject: Re: mount btrfs takes 30 minutes, btrfs check runs out of memory
Date: Mon, 25 Jul 2016 15:01:17 +0200 [thread overview]
Message-ID: <20160725130117.GB30795@suse.cz> (raw)
In-Reply-To: <0ac17bdc-64eb-bbbd-ae90-61cfdc16660d@fb.com>
On Mon, Jul 18, 2016 at 09:42:50AM -0400, Josef Bacik wrote:
> >
> > This makes search for BLOCK_GROUP_ITEM very very very slow if extent tree is
> > really big.
> >
> > On the handle, we search CHUNK_ITEM very very fast, because CHUNK_ITEM are in
> > their own tree.
> > (CHUNK_ITEM and BLOCK_GROUP_ITEM are 1:1 mapped)
> >
> > So to completely fix it, btrfs needs on-disk format change to put
> > BLOCK_GROUP_ITEM into their own tree.
> >
> > IMHO there maybe be some objection from other devs though.
> >
> > Anyway, I add the three maintainers to Cc, and hopes we can get a better idea to
> > fix it.
>
> Yeah I'm going to fix this when I do the per-block group extent tree thing. Thanks,
Will it be capable of "per- subvolume set" extent trees? IOW, a set of
subvolumes will could share extents only among the members of the same
group. The usecase is to start an isolate subvolume and allow snapshots
(and obviously forbid reflinks outside of the group).
next prev parent reply other threads:[~2016-07-25 13:01 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAJ3TwYQXqUZiKhYc5rciTmvGX1RLkHnkQb5SSYAJ7AD+kbudag@mail.gmail.com>
2015-07-31 2:34 ` mount btrfs takes 30 minutes, btrfs check runs out of memory Qu Wenruo
2015-07-31 4:10 ` John Ettedgui
2015-08-02 5:44 ` Georgi Georgiev
[not found] ` <CAJ3TwYRN+1tJY+paz=qZT0_XP=r9CcTKbBgX_kZRFOWj8vSK=w@mail.gmail.com>
2015-07-31 4:52 ` Qu Wenruo
[not found] ` <CAJ3TwYR5g-JhjmGnZUXqLXc7qV1_=AN5_6sj54JQODbtgG9Aag@mail.gmail.com>
2015-07-31 5:40 ` Qu Wenruo
2015-07-31 5:45 ` John Ettedgui
2015-08-01 4:35 ` John Ettedgui
2015-08-01 10:05 ` Russell Coker
2015-08-04 1:39 ` Qu Wenruo
2015-08-04 1:55 ` John Ettedgui
2015-08-04 2:31 ` John Ettedgui
2015-08-04 3:01 ` Qu Wenruo
2015-08-04 4:58 ` John Ettedgui
2015-08-04 6:47 ` Duncan
2015-08-04 11:28 ` Austin S Hemmelgarn
2015-08-04 17:36 ` John Ettedgui
2015-08-05 11:30 ` Austin S Hemmelgarn
2015-08-13 22:38 ` Vincent Olivier
2015-08-13 23:19 ` Chris Murphy
2015-08-14 0:30 ` Duncan
2015-08-14 2:42 ` Vincent Olivier
2015-08-18 17:36 ` Vincent Olivier
2015-08-14 2:39 ` Vincent Olivier
[not found] ` <CAJ3TwYSW+SvbBrh1u_x+c3HTRx03qSR6BoH5cj_VzCXxZYv6EA@mail.gmail.com>
2016-07-15 3:56 ` Qu Wenruo
[not found] ` <CAJ3TwYRXwDVVfT0TRRiM9dEw-7TvY8qG=WvMYKczZOv6wkFWAQ@mail.gmail.com>
2016-07-15 5:24 ` Qu Wenruo
2016-07-15 6:56 ` Kai Krakow
[not found] ` <CAJ3TwYSTnQfj=qmBLtnmtXQKexMMD4x=9Gk3p3anf4uF+G26kw@mail.gmail.com>
[not found] ` <CAJ3TwYTnMPVwkrZEU-=Q_Nq+9Bn0vM3z+EFC8RP=RTyaufSoqw@mail.gmail.com>
2016-07-18 1:13 ` Qu Wenruo
[not found] ` <CAJ3TwYRpc_R-wVur0T6+Uy_aPVXTGpvp_ag1Ar9K2HoB0H1ySQ@mail.gmail.com>
2016-07-18 8:41 ` Qu Wenruo
[not found] ` <CAJ3TwYRH8JVkuv2Hu7FYb+BSwKGrq1spx079zwOF_FO1y=9NFA@mail.gmail.com>
2016-07-18 9:07 ` Qu Wenruo
2016-07-18 15:31 ` Duncan
[not found] ` <CAJ3TwYS6UTkWf=PNku3RG7hPrXMKz3yhk2WqCRLix4v_VwgrmA@mail.gmail.com>
2016-07-21 8:10 ` Qu Wenruo
[not found] ` <CAJ3TwYQ47SVpbO1Pb-TWjhaTCCpMFFmijwTgmV8=7+1_a6_3Ww@mail.gmail.com>
2016-07-21 8:19 ` Qu Wenruo
2016-07-21 15:47 ` Graham Cobb
2017-04-10 0:52 ` Qu Wenruo
2018-02-13 10:21 ` John Ettedgui
2018-02-13 11:04 ` Qu Wenruo
2018-02-13 11:25 ` John Ettedgui
2018-02-13 11:40 ` Qu Wenruo
2018-02-13 12:06 ` John Ettedgui
2018-02-13 12:46 ` Qu Wenruo
2018-02-13 12:52 ` John Ettedgui
2018-02-13 12:26 ` Holger Hoffstätte
2018-02-13 12:54 ` Qu Wenruo
2018-02-13 16:24 ` Holger Hoffstätte
2018-02-14 0:43 ` Qu Wenruo
2016-07-15 11:29 ` Christian Rohmann
2016-07-16 23:53 ` Qu Wenruo
2016-07-18 13:42 ` Josef Bacik
2016-07-19 0:35 ` Qu Wenruo
2016-07-25 13:01 ` David Sterba [this message]
2016-07-25 13:38 ` Josef Bacik
2015-08-04 14:38 ` Chris Murphy
2015-07-29 5:46 Georgi Georgiev
2015-07-29 6:19 ` Qu Wenruo
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=20160725130117.GB30795@suse.cz \
--to=dsterba@suse.cz \
--cc=ahferroin7@gmail.com \
--cc=clm@fb.com \
--cc=crohmann@netcologne.de \
--cc=jbacik@fb.com \
--cc=john.ettedgui@gmail.com \
--cc=linux-btrfs@vger.kernel.org \
--cc=quwenruo.btrfs@gmx.com \
--cc=quwenruo@cn.fujitsu.com \
/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).