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From:   Kashyap Desai <kashyap.desai@broadcom.com>
References: <1634550083-202815-1-git-send-email-john.garry@huawei.com>
In-Reply-To: <1634550083-202815-1-git-send-email-john.garry@huawei.com>
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Date:   Tue, 19 Oct 2021 00:19:13 +0530
Message-ID: <2f09315210261e82c42a1353cab48dcd@mail.gmail.com>
Subject: RE: [PATCH v2] blk-mq: Fix blk_mq_tagset_busy_iter() for shared tags
To:     John Garry <john.garry@huawei.com>, axboe@kernel.dk
Cc:     ming.lei@redhat.com, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, hare@suse.de
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> -----Original Message-----
> From: John Garry [mailto:john.garry@huawei.com]
> Sent: Monday, October 18, 2021 3:11 PM
> To: axboe@kernel.dk
> Cc: ming.lei@redhat.com; linux-block@vger.kernel.org; linux-
> kernel@vger.kernel.org; kashyap.desai@broadcom.com; hare@suse.de; John
> Garry <john.garry@huawei.com>
> Subject: [PATCH v2] blk-mq: Fix blk_mq_tagset_busy_iter() for shared
tags
>
> Since it is now possible for a tagset to share a single set of tags, the
iter
> function should not re-iter the tags for the count of #hw queues in that
case.
> Rather it should just iter once.
>
> Fixes: e0fdf846c7bb ("blk-mq: Use shared tags for shared sbitmap
support")
> Reported-by: Kashyap Desai <kashyap.desai@broadcom.com>
> Signed-off-by: John Garry <john.garry@huawei.com>
> Reviewed-by: Ming Lei <ming.lei@redhat.com>
> ---
> Diff to v1:
> - Add Ming's RB tag

Now I noticed proper host_busy in my test. Still CPU hogging is not
resolved, but issue addressed by this patch is resolved.

Tested-by: Kashyap Desai <kashyap.desai@broadcom.com>

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