linux-kernel - Re: [PATCH v3 5/5] btrfs: ensure that metadata and flush are issued from the root cgroup

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Message-ID: <20171012185646.GG3521@twin.jikos.cz>
Date:   Thu, 12 Oct 2017 20:56:46 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Tejun Heo <tj@...nel.org>
Cc:     dsterba@...e.cz, jack@...e.cz, axboe@...nel.dk, clm@...com,
        jbacik@...com, kernel-team@...com, linux-kernel@...r.kernel.org,
        linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v3 5/5] btrfs: ensure that metadata and flush are issued
 from the root cgroup

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@...nel.org>
> Reviewed-by: Liu Bo <bo.li.liu@...cle.com>
> Cc: David Sterba <dsterba@...e.cz>

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