From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org,
"James E . J . Bottomley" <jejb@linux.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org, Ming Lei <ming.lei@redhat.com>,
Bart Van Assche <bvanassche@acm.org>,
Hannes Reinecke <hare@suse.com>, Christoph Hellwig <hch@lst.de>,
Thomas Gleixner <tglx@linutronix.de>,
Keith Busch <keith.busch@intel.com>
Subject: [RFC PATCH 1/7] blk-mq: add new state of BLK_MQ_S_INTERNAL_STOPPED
Date: Fri, 12 Jul 2019 10:47:20 +0800 [thread overview]
Message-ID: <20190712024726.1227-2-ming.lei@redhat.com> (raw)
In-Reply-To: <20190712024726.1227-1-ming.lei@redhat.com>
Add a new hw queue state of BLK_MQ_S_INTERNAL_STOPPED, which prepares
for stopping hw queue before all CPUs of this hctx become offline.
We can't reuse BLK_MQ_S_STOPPED because that state can be cleared during IO
completion.
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Keith Busch <keith.busch@intel.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
block/blk-mq-debugfs.c | 1 +
block/blk-mq.h | 3 ++-
include/linux/blk-mq.h | 3 +++
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index b3f2ba483992..af40a02c46ee 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -213,6 +213,7 @@ static const char *const hctx_state_name[] = {
HCTX_STATE_NAME(STOPPED),
HCTX_STATE_NAME(TAG_ACTIVE),
HCTX_STATE_NAME(SCHED_RESTART),
+ HCTX_STATE_NAME(INTERNAL_STOPPED),
};
#undef HCTX_STATE_NAME
diff --git a/block/blk-mq.h b/block/blk-mq.h
index f4bf5161333e..9d821adf5765 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -176,7 +176,8 @@ static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data
static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
{
- return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
+ return test_bit(BLK_MQ_S_STOPPED, &hctx->state) ||
+ test_bit(BLK_MQ_S_INTERNAL_STOPPED, &hctx->state);
}
static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 3fa1fa59f9b2..3a731c3c0762 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -228,6 +228,9 @@ enum {
BLK_MQ_S_TAG_ACTIVE = 1,
BLK_MQ_S_SCHED_RESTART = 2,
+ /* hw queue is internal stopped, driver do not use it */
+ BLK_MQ_S_INTERNAL_STOPPED = 3,
+
BLK_MQ_MAX_DEPTH = 10240,
BLK_MQ_CPU_WORK_BATCH = 8,
--
2.20.1
next prev parent reply other threads:[~2019-07-12 2:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 2:47 [RFC PATCH 0/7] blk-mq: improvement on handling IO during CPU hotplug Ming Lei
2019-07-12 2:47 ` Ming Lei [this message]
2019-07-12 2:47 ` [RFC PATCH 2/7] blk-mq: add blk-mq flag of BLK_MQ_F_NO_MANAGED_IRQ Ming Lei
2019-07-16 2:53 ` John Garry
2019-07-16 6:08 ` Ming Lei
2019-07-12 2:47 ` [RFC PATCH 3/7] blk-mq: stop to handle IO before hctx's all CPUs become offline Ming Lei
2019-07-12 9:03 ` Minwoo Im
2019-07-16 3:03 ` John Garry
2019-07-16 6:12 ` Ming Lei
2019-07-12 2:47 ` [RFC PATCH 4/7] blk-mq: add callback of .free_request Ming Lei
2019-07-12 2:47 ` [RFC PATCH 5/7] SCSI: implement .free_request callback Ming Lei
2019-07-12 2:47 ` [RFC PATCH 6/7] blk-mq: re-submit IO in case that hctx is dead Ming Lei
2019-07-12 2:47 ` [RFC PATCH 7/7] blk-mq: handle requests dispatched from IO scheduler " Ming Lei
2019-07-16 6:54 ` [RFC PATCH 0/7] blk-mq: improvement on handling IO during CPU hotplug John Garry
2019-07-16 7:18 ` Ming Lei
2019-07-16 8:13 ` John Garry
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