linux-kernel - Re: [PATCH 04/13] blk: introduce REQ

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Message-ID: <20180530155824.GL1351649@devbig577.frc2.facebook.com>
Date:   Wed, 30 May 2018 08:58:24 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     axboe@...nel.dk, kernel-team@...com, linux-block@...r.kernel.org,
        akpm@...ux-foundation.org, linux-mm@...ck.org, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Josef Bacik <jbacik@...com>
Subject: Re: [PATCH 04/13] blk: introduce REQ_SWAP

On Tue, May 29, 2018 at 05:17:15PM -0400, 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.
> 
> Signed-off-by: Josef Bacik <jbacik@...com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun