linux-kernel - Re: [PATCH 04/14] blk: introduce REQ

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Message-ID: <702d4535-5ea7-8704-b23c-91c44fda34a8@kernel.dk>
Date:   Mon, 2 Jul 2018 15:47:41 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Josef Bacik <josef@...icpanda.com>, kernel-team@...com,
        linux-block@...r.kernel.org, akpm@...ux-foundation.org,
        hannes@...xchg.org, tj@...nel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Cc:     Josef Bacik <jbacik@...com>
Subject: Re: [PATCH 04/14] blk: introduce REQ_SWAP

On 6/29/18 1:25 PM, Josef Bacik wrote:
> From: Josef Bacik <jbacik@...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