From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Theodore Ts'o <tytso-3s7WtUTddSA@public.gmane.org>,
Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.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-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.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
next prev parent 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 for cgroup writeback support Tejun Heo
2015-06-12 21:57 ` [PATCH 1/3] writeback: do foreign inode detection iff cgroup writeback is enabled Tejun Heo
[not found] ` <1434146254-26220-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-06-12 21:57 ` [PATCH 2/3] vfs, writeback: replace FS_CGROUP_WRITEBACK with MS_CGROUPWB Tejun Heo
[not found] ` <1434146254-26220-3-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-06-13 16:16 ` Christoph Hellwig
[not found] ` <20150613161608.GA29414-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-06-14 5:42 ` Tejun Heo
[not found] ` <20150614054236.GA9662-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
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
[not found] ` <1434146254-26220-4-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-06-15 17:28 ` Vivek Goyal
2015-06-15 18:23 ` Tejun Heo
[not found] ` <20150615182345.GB18517-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-06-15 23:35 ` Theodore Ts'o
[not found] ` <20150615233519.GB30059-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-06-16 21:54 ` Tejun Heo [this message]
2015-06-17 3:15 ` Theodore Ts'o
[not found] ` <20150617031540.GB4076-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-06-17 18:52 ` Tejun Heo
[not found] ` <20150617185237.GL22637-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-06-17 21:48 ` Theodore Ts'o
[not found] ` <20150617214852.GE4076-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-06-20 20:00 ` Tejun Heo
-- strict thread matches above, loose matches on Subject: below --
2015-06-16 22:48 [PATCHSET v2 block/for-4.2/writeback] cgroup, writeback: misc updates " Tejun Heo
[not found] ` <1434494912-31043-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-06-16 22:48 ` [PATCH 3/3] writeback, blkio: add documentation " Tejun Heo
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