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From: David Sterba <dsterba@suse.cz>
To: Tejun Heo <tj@kernel.org>
Cc: dsterba@suse.cz, jack@suse.cz, axboe@kernel.dk, clm@fb.com,
	jbacik@fb.com, kernel-team@fb.com, linux-kernel@vger.kernel.org,
	linux-btrfs@vger.kernel.org
Subject: Re: [PATCH v3 5/5] btrfs: ensure that metadata and flush are issued from the root cgroup
Date: Thu, 12 Oct 2017 20:56:46 +0200	[thread overview]
Message-ID: <20171012185646.GG3521@twin.jikos.cz> (raw)
In-Reply-To: <20171012170628.GS3301751@devbig577.frc2.facebook.com>

On Thu, Oct 12, 2017 at 10:06:28AM -0700, Tejun Heo wrote:
> Issuing metdata or otherwise shared IOs from !root cgroup can lead to
> priority inversion.  This patch ensures that those IOs are always
> issued from the root cgroup.
> 
> v3: Dropped unnecessary btree_inode handling as suggested by David
>     Sterba.
> 
> v2: Fixed missing @bh in submit_bh_blkcg_css() call.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
> Cc: David Sterba <dsterba@suse.cz>

Acked-by: David Sterba <dsterba@suse.com>

  reply	other threads:[~2017-10-12 18:58 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-10 15:54 [PATCHSET v2] cgroup, writeback, btrfs: make sure btrfs issues metadata IOs from the root cgroup Tejun Heo
2017-10-10 15:54 ` [PATCH 1/5] blkcg: export blkcg_root_css Tejun Heo
2017-10-11  7:50   ` Jan Kara
2017-10-10 15:54 ` [PATCH 2/5] cgroup, writeback: replace SB_I_CGROUPWB with per-inode S_CGROUPWB Tejun Heo
2017-10-10 15:54 ` [PATCH 3/5] buffer_head: separate out create_bh_bio() from submit_bh_wbc() Tejun Heo
2017-10-11  7:54   ` Jan Kara
2017-10-10 15:54 ` [PATCH 4/5] cgroup, buffer_head: implement submit_bh_blkcg_css() Tejun Heo
2017-10-11  7:55   ` Jan Kara
2017-10-10 15:54 ` [PATCH 5/5] btrfs: ensure that metadata and flush are issued from the root cgroup Tejun Heo
2017-10-10 16:43   ` [PATCH v2 " Tejun Heo
2017-10-10 17:45     ` Liu Bo
2017-10-11 17:07     ` David Sterba
2017-10-12 15:38       ` Tejun Heo
2017-10-12 17:06       ` [PATCH v3 " Tejun Heo
2017-10-12 18:56         ` David Sterba [this message]
2017-11-29 16:56 ` [PATCHSET v2] cgroup, writeback, btrfs: make sure btrfs issues metadata IOs " Jan Kara
2017-11-29 17:03   ` Tejun Heo
2017-11-29 17:05     ` Tejun Heo
2017-11-29 18:38       ` Chris Mason
2017-11-30 17:23         ` David Sterba
2017-11-30 17:34           ` Chris Mason
2017-12-01 10:52         ` Jan Kara

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