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From: Tejun Heo <tj@kernel.org>
To: "Theodore Ts'o" <tytso@mit.edu>, Vivek Goyal <vgoyal@redhat.com>,
	axboe@kernel.dk, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, lizefan@huawei.com,
	cgroups@vger.kernel.org
Subject: Re: [PATCH 3/3] writeback, blkio: add documentation for cgroup writeback support
Date: Tue, 16 Jun 2015 17:54:36 -0400	[thread overview]
Message-ID: <20150616215436.GE22637@mtj.duckdns.org> (raw)
In-Reply-To: <20150615233519.GB30059@thunk.org>

Hello, Ted.

On Mon, Jun 15, 2015 at 07:35:19PM -0400, Theodore Ts'o wrote:
> So if there is some way we can signal to any cgroup that that might be
> throttling writeback or disk I/O that the jbd/jbd2 process should be
> considered privileged, that would be a good since it would allow us to
> avoid a potential priority inversion problem. 

I see.  In the long term, I think we might need to come up with a way
to overcharge a slower cgroup to avoid blocking faster ones for cases
where some IOs are depended upon by more than one cgroups.  That'd
take quite a bit of work from blkcg side.  Will think more about it.

Thanks.

-- 
tejun

  reply	other threads:[~2015-06-16 21:54 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-12 21:57 [PATCHSET block/for-4.2/writeback] cgroup, writeback: misc updates " Tejun Heo
2015-06-12 21:57 ` [PATCH 1/3] writeback: do foreign inode detection iff cgroup writeback is enabled Tejun Heo
2015-06-12 21:57 ` [PATCH 2/3] vfs, writeback: replace FS_CGROUP_WRITEBACK with MS_CGROUPWB Tejun Heo
2015-06-13 16:16   ` Christoph Hellwig
2015-06-14  5:42     ` Tejun Heo
2015-06-15 11:39       ` Jan Kara
2015-06-12 21:57 ` [PATCH 3/3] writeback, blkio: add documentation for cgroup writeback support Tejun Heo
2015-06-15 17:28   ` Vivek Goyal
2015-06-15 18:23     ` Tejun Heo
2015-06-15 23:35       ` Theodore Ts'o
2015-06-16 21:54         ` Tejun Heo [this message]
2015-06-17  3:15           ` Theodore Ts'o
2015-06-17 18:52             ` Tejun Heo
2015-06-17 21:48               ` Theodore Ts'o
2015-06-20 20:00                 ` Tejun Heo
2015-06-16 22:48 [PATCHSET v2 block/for-4.2/writeback] cgroup, writeback: misc updates " Tejun Heo
2015-06-16 22:48 ` [PATCH 3/3] writeback, blkio: add documentation " Tejun Heo

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