From: Ming Lei <ming.lei@redhat.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: Very slow qemu device access
Date: Sun, 9 Aug 2020 10:40:05 +0800 [thread overview]
Message-ID: <20200809024005.GC2134904@T590> (raw)
In-Reply-To: <20200807174416.GF17456@casper.infradead.org>
Hello Matthew,
On Fri, Aug 07, 2020 at 06:44:16PM +0100, Matthew Wilcox wrote:
>
> Everything starts going very slowly after this commit:
>
> commit 37f4a24c2469a10a4c16c641671bd766e276cf9f (refs/bisect/bad)
> Author: Ming Lei <ming.lei@redhat.com>
> Date: Tue Jun 30 22:03:57 2020 +0800
>
> blk-mq: centralise related handling into blk_mq_get_driver_tag
Yeah, the above is one known bad commit, which is reverted in
4e2f62e566b5 ("Revert "blk-mq: put driver tag when this request is completed")
Finally the fixed patch of 'blk-mq: centralise related handling into blk_mq_get_driver_tag'
is merged as 568f27006577 ("blk-mq: centralise related handling into blk_mq_get_driver_tag").
So please test either 4e2f62e566b5 or 568f27006577 and see if there is
such issue.
Thanks,
Ming
next prev parent reply other threads:[~2020-08-09 2:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 17:44 Very slow qemu device access Matthew Wilcox
2020-08-09 2:40 ` Ming Lei [this message]
2020-08-09 14:25 ` Matthew Wilcox
2020-08-10 3:10 ` Ming Lei
2020-08-10 3:22 ` Matthew Wilcox
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