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Subject: Re: [PATCH 04/14] blk: introduce REQ_SWAP
To:     Josef Bacik <josef@toxicpanda.com>, kernel-team@fb.com,
        linux-block@vger.kernel.org, akpm@linux-foundation.org,
        hannes@cmpxchg.org, tj@kernel.org, linux-kernel@vger.kernel.org,
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Cc:     Josef Bacik <jbacik@fb.com>
References: <20180629192542.26649-1-josef@toxicpanda.com>
 <20180629192542.26649-5-josef@toxicpanda.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <702d4535-5ea7-8704-b23c-91c44fda34a8@kernel.dk>
Date:   Mon, 2 Jul 2018 15:47:41 -0600
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On 6/29/18 1:25 PM, Josef Bacik wrote:
> From: Josef Bacik <jbacik@fb.com>
> 
> Just like REQ_META, it's important to know the IO coming down is swap
> in order to guard against potential IO priority inversion issues with
> cgroups.  Add REQ_SWAP and use it for all swap IO, and add it to our
> bio_issue_as_root_blkg helper.

We should convert wbt to use that as well.

-- 
Jens Axboe