From: Chris Mason <clm@fb.com>
To: Dennis Zhou <dennis@kernel.org>
Cc: David Sterba <dsterba@suse.com>,
Josef Bacik <josef@toxicpanda.com>,
Kernel Team <Kernel-team@fb.com>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH 1/2] btrfs: punt all bios created in btrfs_submit_compressed_write()
Date: Thu, 12 Dec 2019 00:15:46 +0000 [thread overview]
Message-ID: <8768C12C-9FD0-4BC5-BB4B-6AC9CB2EE29B@fb.com> (raw)
In-Reply-To: <d934383ea528d920a95b6107daad6023b516f0f4.1576109087.git.dennis@kernel.org>
On 11 Dec 2019, at 19:07, Dennis Zhou wrote:
> Compressed writes happen in the background via kworkers. However, this
> causes bios to be attributed to root bypassing any cgroup limits from
> the actual writer. We tag the first bio with REQ_CGROUP_PUNT, which
> will
> punt the bio to an appropriate cgroup specific workqueue and attribute
> the IO properly. However, if btrfs_submit_compressed_write() creates a
> new bio, we don't tag it the same way. Add the appropriate tagging for
> subsequent bios.
>
> Fixes: ec39f7696ccfa ("Btrfs: use REQ_CGROUP_PUNT for worker thread
> submitted bios")
> Cc: Chris Mason <clm@fb.com>
> Signed-off-by: Dennis Zhou <dennis@kernel.org>
Good catch Dennis. The compression code should end up limiting the size
of the bio such that we'll never actually fail to bio_add_page(), but
this is still the right thing to do.
Reviewed-by: Chris Mason <clm@fb.com>
-chris
next prev parent reply other threads:[~2019-12-12 0:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-12 0:07 [PATCH 1/2] btrfs: punt all bios created in btrfs_submit_compressed_write() Dennis Zhou
2019-12-12 0:07 ` [PATCH 2/2] btrfs: fix compressed write bio attribution Dennis Zhou
2019-12-12 15:18 ` David Sterba
2019-12-12 16:19 ` Dennis Zhou
2019-12-12 18:19 ` [PATCH v2 " Dennis Zhou
2019-12-13 12:24 ` David Sterba
2019-12-13 22:21 ` Dennis Zhou
2019-12-17 15:05 ` David Sterba
2019-12-17 18:44 ` Dennis Zhou
2019-12-12 0:15 ` Chris Mason [this message]
2019-12-30 15:08 ` [PATCH 1/2] btrfs: punt all bios created in btrfs_submit_compressed_write() David Sterba
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=8768C12C-9FD0-4BC5-BB4B-6AC9CB2EE29B@fb.com \
--to=clm@fb.com \
--cc=Kernel-team@fb.com \
--cc=dennis@kernel.org \
--cc=dsterba@suse.com \
--cc=josef@toxicpanda.com \
--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).