From: Bart Van Assche <bart.vanassche@sandisk.com>
To: Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>,
Christoph Hellwig <hch@infradead.org>,
device-mapper development <dm-devel@redhat.com>,
Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Subject: Re: blk-mq request allocation stalls
Date: Mon, 12 Jan 2015 17:12:05 +0100 [thread overview]
Message-ID: <54B3F255.5080802@sandisk.com> (raw)
In-Reply-To: <54B3EB4A.9090404@kernel.dk>
On 01/12/15 16:42, Jens Axboe wrote:
> On 01/12/2015 07:46 AM, Bart Van Assche wrote:
>> bt_get: __bt_get() returned -1
>> queue_num=2, nr_tags=62, reserved_tags=0, bits_per_word=3
>> nr_free=62, nr_reserved=0, may_queue=0
>> active_queues=8
>
> Can you add dumping of hctx->nr_active when this fails? You case is that
> the may_queue logic says no-can-do, so it smells like the nr_active
> accounting is wonky since you have supposedly no allocated tags, yet it
> clearly thinks that you do.
Hello Jens,
The requested output is as follows:
bt_get: __bt_get() returned -1
queue_num=0, nr_tags=62, reserved_tags=0, bits_per_word=3
nr_free=62, nr_reserved=0, hctx->tags->active_queues=7,
hctx->nr_active=9, hctx_may_queue()=0
active_queues=7
CPU: 0 PID: 3111 Comm: kdmwork-253:6 Tainted: G W
3.19.0-rc4-debug+ #1
Call Trace:
[<ffffffff814d2763>] dump_stack+0x4c/0x65
[<ffffffff81259dc7>] bt_get+0x97/0x1e0
[<ffffffff8125a0af>] blk_mq_get_tag+0x9f/0xd0
[<ffffffff8125522b>] __blk_mq_alloc_request+0x1b/0x210
[<ffffffff81256a30>] blk_mq_alloc_request+0xa0/0x150
[<ffffffff8124ba9e>] blk_get_request+0x2e/0xe0
[<ffffffffa07d9d0f>] __multipath_map.isra.15+0x1cf/0x210 [dm_multipath]
[<ffffffffa07d9d6a>] multipath_clone_and_map+0x1a/0x20 [dm_multipath]
[<ffffffffa0350bb5>] map_tio_request+0x1d5/0x3a0 [dm_mod]
[<ffffffff81075d16>] kthread_worker_fn+0x86/0x1b0
[<ffffffff81075c0f>] kthread+0xef/0x110
[<ffffffff814db4ec>] ret_from_fork+0x7c/0xb0
Bart.
next prev parent reply other threads:[~2015-01-12 16:12 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-17 3:59 [PATCH v3 0/8] dm: add request-based blk-mq support Mike Snitzer
2014-12-17 3:59 ` [PATCH v3 1/8] block: require blk_rq_prep_clone() be given an initialized clone request Mike Snitzer
2014-12-17 3:59 ` [PATCH v3 2/8] block: initialize bio member of blk-mq request to NULL Mike Snitzer
2014-12-17 3:59 ` [PATCH v3 3/8] block: add blk-mq support to blk_insert_cloned_request() Mike Snitzer
2014-12-17 4:00 ` [PATCH v3 4/8] block: mark blk-mq devices as stackable Mike Snitzer
2014-12-17 4:00 ` [PATCH v3 5/8] dm: remove exports for request-based interfaces without external callers Mike Snitzer
2014-12-17 4:00 ` [PATCH v3 6/8] dm: split request structure out from dm_rq_target_io structure Mike Snitzer
2014-12-17 4:00 ` [PATCH v3 7/8] dm: submit stacked requests in irq enabled context Mike Snitzer
2014-12-17 4:00 ` [PATCH v3 8/8] dm: allocate requests from target when stacking on blk-mq devices Mike Snitzer
2014-12-17 22:35 ` Mike Snitzer
2014-12-17 21:42 ` [PATCH v3 0/8] dm: add request-based blk-mq support Keith Busch
2014-12-17 21:43 ` Jens Axboe
2014-12-17 23:06 ` Mike Snitzer
2014-12-18 1:41 ` Keith Busch
2014-12-18 4:58 ` Mike Snitzer
2014-12-19 14:32 ` Bart Van Assche
2014-12-19 15:38 ` Mike Snitzer
2014-12-19 17:14 ` Mike Snitzer
2014-12-22 15:28 ` Bart Van Assche
2014-12-22 18:49 ` Mike Snitzer
2014-12-23 16:24 ` Bart Van Assche
2014-12-23 17:13 ` Mike Snitzer
2014-12-23 21:42 ` Mike Snitzer
2014-12-24 13:02 ` Bart Van Assche
2014-12-24 18:21 ` Mike Snitzer
2014-12-24 18:55 ` Mike Snitzer
2014-12-24 19:26 ` Mike Snitzer
2015-01-02 17:53 ` Bart Van Assche
2015-01-05 21:35 ` Mike Snitzer
2015-01-06 8:59 ` Christoph Hellwig
2015-01-06 9:31 ` Bart Van Assche
2015-01-06 16:05 ` blk-mq request allocation stalls [was: Re: [PATCH v3 0/8] dm: add request-based blk-mq support] Mike Snitzer
2015-01-06 16:15 ` Jens Axboe
2015-01-07 10:33 ` Bart Van Assche
2015-01-07 15:32 ` Jens Axboe
2015-01-07 16:15 ` Mike Snitzer
2015-01-07 16:18 ` Jens Axboe
2015-01-07 16:22 ` Mike Snitzer
2015-01-07 16:24 ` Jens Axboe
2015-01-07 17:18 ` Mike Snitzer
2015-01-07 17:35 ` Jens Axboe
2015-01-07 20:09 ` Mike Snitzer
2015-01-07 20:40 ` Keith Busch
2015-01-09 19:49 ` Mike Snitzer
2015-01-09 21:07 ` Jens Axboe
2015-01-09 21:11 ` Jens Axboe
2015-01-09 21:40 ` Mike Snitzer
2015-01-09 21:56 ` Jens Axboe
2015-01-09 22:25 ` Mike Snitzer
2015-01-10 0:27 ` Jens Axboe
2015-01-10 1:48 ` Mike Snitzer
2015-01-10 1:59 ` Jens Axboe
2015-01-10 3:10 ` Mike Snitzer
2015-01-12 14:46 ` blk-mq request allocation stalls Bart Van Assche
2015-01-12 15:42 ` Jens Axboe
2015-01-12 16:12 ` Bart Van Assche [this message]
2015-01-12 16:34 ` Jens Axboe
2015-01-12 16:58 ` Mike Snitzer
2015-01-12 16:59 ` Jens Axboe
2015-01-12 17:04 ` Bart Van Assche
2015-01-12 17:09 ` Jens Axboe
2015-01-12 17:53 ` Keith Busch
2015-01-12 18:12 ` Jens Axboe
2015-01-12 18:22 ` Keith Busch
2015-01-12 18:35 ` Keith Busch
2015-01-12 19:11 ` Mike Snitzer
2015-01-12 20:21 ` Mike Snitzer
2015-01-13 12:29 ` Bart Van Assche
2015-01-13 14:17 ` Mike Snitzer
2015-01-13 14:28 ` dm + blk-mq soft lockup complaint Bart Van Assche
2015-01-13 16:20 ` Mike Snitzer
2015-01-14 9:16 ` Bart Van Assche
2015-01-14 18:59 ` Mike Snitzer
2015-01-15 8:11 ` Bart Van Assche
2015-01-15 15:43 ` Mike Snitzer
2015-01-15 15:55 ` Bart Van Assche
2015-01-13 14:59 ` blk-mq request allocation stalls Jens Axboe
2015-01-13 15:11 ` Keith Busch
2015-01-13 15:27 ` Keith Busch
2015-01-13 15:41 ` Mike Snitzer
2015-01-13 15:14 ` Mike Snitzer
2015-01-27 18:42 ` blk-mq DM changes for 3.20 [was: Re: blk-mq request allocation stalls] Mike Snitzer
2015-01-28 16:42 ` Jens Axboe
2015-01-28 17:44 ` Mike Snitzer
2015-01-28 17:49 ` Jens Axboe
2015-01-28 18:10 ` Mike Snitzer
2015-01-29 22:43 ` blk-mq DM changes for 3.20 [was: Re: blk-mq request allocation stalls]X Keith Busch
2015-01-29 23:09 ` Mike Snitzer
2015-01-29 23:44 ` Keith Busch
2015-01-30 0:32 ` Mike Snitzer
2015-01-12 19:05 ` blk-mq request allocation stalls Jens Axboe
2015-01-12 19:07 ` Mike Snitzer
2015-01-12 18:19 ` Mike Snitzer
2014-12-17 22:51 ` [PATCH v3 0/8] dm: add request-based blk-mq support Mike Snitzer
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