From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Oleksandr Natalenko <oleksandr@natalenko.name>
Subject: Re: [PATCH] block: return ELEVATOR_DISCARD_MERGE if possible
Date: Tue, 10 Aug 2021 10:47:32 +0800 [thread overview]
Message-ID: <YRHoxGKjD9JHjiXh@T590> (raw)
In-Reply-To: <a60094bf-c5b7-9b26-43b6-11188409edf1@kernel.dk>
On Mon, Aug 09, 2021 at 02:36:25PM -0600, Jens Axboe wrote:
> On 8/4/21 9:35 PM, Ming Lei wrote:
> > On Thu, Jul 29, 2021 at 11:42:26AM +0800, Ming Lei wrote:
> >> When merging one bio to request, if they are discard IO and the queue
> >> supports multi-range discard, we need to return ELEVATOR_DISCARD_MERGE
> >> because both block core and related drivers(nvme, virtio-blk) doesn't
> >> handle mixed discard io merge(traditional IO merge together with
> >> discard merge) well.
> >>
> >> Fix the issue by returning ELEVATOR_DISCARD_MERGE in this situation,
> >> so both blk-mq and drivers just need to handle multi-range discard.
> >>
> >> Reported-by: Oleksandr Natalenko <oleksandr@natalenko.name>
> >> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> >
> > Hello Jens and Guys,
> >
> > Ping...
>
> Since this isn't a new regression this release and since this kind
> of change always makes me a bit nervous, any objections to queueing
> it up for 5.15 with the stable/fixes tags?
Fine, will post a new version with fixes tag.
--
Ming
next prev parent reply other threads:[~2021-08-10 2:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 3:42 [PATCH] block: return ELEVATOR_DISCARD_MERGE if possible Ming Lei
2021-07-29 7:17 ` Oleksandr Natalenko
2021-07-29 9:18 ` Ming Lei
2021-08-05 3:35 ` Ming Lei
2021-08-09 20:30 ` Oleksandr Natalenko
2021-08-09 20:36 ` Jens Axboe
2021-08-10 2:47 ` Ming Lei [this message]
2021-08-10 2:55 ` Jens Axboe
2021-08-10 3:28 ` Ming Lei
-- strict thread matches above, loose matches on Subject: below --
2022-05-21 18:56 Gwendal Grignou
2022-05-23 15:13 ` Greg KH
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