From: Ming Lei <ming.lei@redhat.com>
To: Bart Van Assche <bvanassche@acm.org>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, John Garry <john.garry@huawei.com>,
Hannes Reinecke <hare@suse.com>, Christoph Hellwig <hch@lst.de>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH V10 06/11] blk-mq: prepare for draining IO when hctx's all CPUs are offline
Date: Sat, 9 May 2020 10:09:26 +0800 [thread overview]
Message-ID: <20200509020926.GB1392681@T590> (raw)
In-Reply-To: <756074a0-ea4b-5dcf-9348-e5b4f4414248@acm.org>
On Fri, May 08, 2020 at 04:26:17PM -0700, Bart Van Assche wrote:
> On 2020-05-04 19:09, Ming Lei wrote:
> > @@ -391,6 +393,7 @@ struct blk_mq_ops {
> > enum {
> > BLK_MQ_F_SHOULD_MERGE = 1 << 0,
> > BLK_MQ_F_TAG_SHARED = 1 << 1,
> > + BLK_MQ_F_NO_MANAGED_IRQ = 1 << 2,
> > BLK_MQ_F_BLOCKING = 1 << 5,
> > BLK_MQ_F_NO_SCHED = 1 << 6,
> > BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
> > diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
> > index 77d70b633531..24b3a77810b6 100644
> > --- a/include/linux/cpuhotplug.h
> > +++ b/include/linux/cpuhotplug.h
> > @@ -152,6 +152,7 @@ enum cpuhp_state {
> > CPUHP_AP_SMPBOOT_THREADS,
> > CPUHP_AP_X86_VDSO_VMA_ONLINE,
> > CPUHP_AP_IRQ_AFFINITY_ONLINE,
> > + CPUHP_AP_BLK_MQ_ONLINE,
> > CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
> > CPUHP_AP_X86_INTEL_EPB_ONLINE,
> > CPUHP_AP_PERF_ONLINE,
>
> Wouldn't BLK_MQ_F_NO_IRQ be a better name than BLK_MQ_F_NO_MANAGED_IRQ?
No, what this patchset tries to do is to address request timeout or hang
issue in case that managed irq is applied in blk-mq driver.
>
> Please add comments that explain what BLK_MQ_F_NO_MANAGED_IRQ and
> CPUHP_AP_BLK_MQ_ONLINE mean.
I believe both are self-document:
- BLK_MQ_F_NO_MANAGED_IRQ
No managened irq is applied on the driver
- CPUHP_AP_BLK_MQ_ONLINE
It is a standard naming of cpuhp state, which means the startup and
teardown callbacks are called when the passed CPU is still online.
Thanks,
Ming
next prev parent reply other threads:[~2020-05-09 2:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 2:09 [PATCH V10 00/11] blk-mq: improvement CPU hotplug Ming Lei
2020-05-05 2:09 ` [PATCH V10 01/11] block: clone nr_integrity_segments and write_hint in blk_rq_prep_clone Ming Lei
2020-05-05 2:09 ` [PATCH V10 02/11] block: add helper for copying request Ming Lei
2020-05-05 2:09 ` [PATCH V10 03/11] blk-mq: mark blk_mq_get_driver_tag as static Ming Lei
2020-05-05 2:09 ` [PATCH V10 04/11] blk-mq: assign rq->tag in blk_mq_get_driver_tag Ming Lei
2020-05-05 2:09 ` [PATCH V10 05/11] blk-mq: support rq filter callback when iterating rqs Ming Lei
2020-05-08 23:32 ` Bart Van Assche
2020-05-09 0:18 ` Bart Van Assche
2020-05-09 2:05 ` Ming Lei
2020-05-09 3:08 ` Bart Van Assche
2020-05-09 3:52 ` Ming Lei
2020-05-05 2:09 ` [PATCH V10 06/11] blk-mq: prepare for draining IO when hctx's all CPUs are offline Ming Lei
2020-05-05 6:14 ` Hannes Reinecke
2020-05-08 23:26 ` Bart Van Assche
2020-05-09 2:09 ` Ming Lei [this message]
2020-05-09 3:11 ` Bart Van Assche
2020-05-09 3:56 ` Ming Lei
2020-05-05 2:09 ` [PATCH V10 07/11] blk-mq: stop to handle IO and drain IO before hctx becomes inactive Ming Lei
2020-05-08 23:39 ` Bart Van Assche
2020-05-09 2:20 ` Ming Lei
2020-05-09 3:24 ` Bart Van Assche
2020-05-09 4:10 ` Ming Lei
2020-05-09 14:18 ` Bart Van Assche
2020-05-11 1:45 ` Ming Lei
2020-05-11 3:20 ` Bart Van Assche
2020-05-11 3:48 ` Ming Lei
2020-05-11 20:56 ` Bart Van Assche
2020-05-12 1:25 ` Ming Lei
2020-05-05 2:09 ` [PATCH V10 08/11] block: add blk_end_flush_machinery Ming Lei
2020-05-05 2:09 ` [PATCH V10 09/11] blk-mq: add blk_mq_hctx_handle_dead_cpu for handling cpu dead Ming Lei
2020-05-05 2:09 ` [PATCH V10 10/11] blk-mq: re-submit IO in case that hctx is inactive Ming Lei
2020-05-05 2:09 ` [PATCH V10 11/11] block: deactivate hctx when the hctx is actually inactive Ming Lei
2020-05-09 14:07 ` Bart Van Assche
2020-05-11 2:11 ` Ming Lei
2020-05-11 3:30 ` Bart Van Assche
2020-05-11 4:08 ` Ming Lei
2020-05-11 20:52 ` Bart Van Assche
2020-05-12 1:43 ` Ming Lei
2020-05-12 2:08 ` Ming Lei
2020-05-08 21:49 ` [PATCH V10 00/11] blk-mq: improvement CPU hotplug Ming Lei
2020-05-09 3:17 ` Jens Axboe
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