From: Christoph Hellwig <hch@infradead.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>,
Shaohua Li <shli@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [patch]blk-mq: blk_mq_tag_to_rq should handle flush request
Date: Wed, 4 Jun 2014 08:05:08 -0700 [thread overview]
Message-ID: <20140604150508.GA21551@infradead.org> (raw)
In-Reply-To: <538F34FB.7050003@kernel.dk>
On Wed, Jun 04, 2014 at 09:02:19AM -0600, Jens Axboe wrote:
> OK strange, there hasn't been that much churn since the last rebase.
> In my for-linus, there's a patch for a single queue crash, but that
> should just hit for the removal case. And then there's the atomic
> schedule patch, but that issue was actually in the code base for
> about a month, so not a new one either.
You're request initializaion optimization doesn't set up req->cmd and
thus causes all BLOCK_PC I/O (including the SCSI LUN scan) to crash and
burn. The trivial fix is on your way.
The performance regression is caused by "blk-mq: avoid code
duplication", but I don't really understand why yet.
next prev parent reply other threads:[~2014-06-04 15:05 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 12:07 [patch]blk-mq: blk_mq_tag_to_rq should handle flush request Shaohua Li
2014-05-09 15:00 ` Christoph Hellwig
2014-05-10 4:00 ` Shaohua Li
2014-05-11 17:40 ` Jens Axboe
2014-05-30 14:09 ` Jens Axboe
2014-06-04 11:11 ` Christoph Hellwig
2014-06-04 14:15 ` Jens Axboe
2014-06-04 14:20 ` Christoph Hellwig
2014-06-04 14:54 ` Jens Axboe
2014-06-04 14:58 ` Christoph Hellwig
2014-06-04 15:02 ` Jens Axboe
2014-06-04 15:05 ` Christoph Hellwig [this message]
2014-06-04 15:08 ` Jens Axboe
2014-06-04 15:10 ` Christoph Hellwig
2014-06-04 15:11 ` Jens Axboe
2014-06-04 15:16 ` Christoph Hellwig
2014-06-04 15:19 ` Jens Axboe
2014-06-04 15:22 ` Christoph Hellwig
2014-06-04 15:28 ` Jens Axboe
2014-06-04 15:31 ` Christoph Hellwig
2014-06-04 15:39 ` Jens Axboe
2014-06-04 15:47 ` Jens Axboe
2014-06-04 16:25 ` Jens Axboe
2014-06-05 1:27 ` Shaohua Li
2014-06-05 2:05 ` Jens Axboe
2014-06-05 2:27 ` Shaohua Li
2014-06-05 2:40 ` Jens Axboe
2014-06-04 15:43 ` Ming Lei
2014-06-04 15:48 ` Jens Axboe
2014-06-04 16:00 ` Ming Lei
2014-06-04 16:09 ` Jens Axboe
2014-06-04 16:26 ` Ming Lei
2014-06-04 16:28 ` Jens Axboe
2014-06-04 16:33 ` Christoph Hellwig
2014-06-04 16:36 ` Ming Lei
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