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block: Protect against concurrent isolated cpuset change

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The block subsystem prevents running the workqueue to isolated CPUs,
including those defined by cpuset isolated partitions. Since
HK_TYPE_DOMAIN will soon contain both and be subject to runtime
modifications, synchronize against housekeeping using the relevant lock.

For full support of cpuset changes, the block subsystem may need to
propagate changes to isolated cpumask through the workqueue in the
future.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Jens Axboe <axboe@kernel.dk>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
Cc: linux-block@vger.kernel.org
This commit is contained in:
Frederic Weisbecker
2025-05-15 16:50:04 +02:00
parent 662ff1aac8
commit 53c2f9d1b1
1 changed files with 5 additions and 1 deletions
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6
block/blk-mq.c
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@@ -4257,12 +4257,16 @@ static void blk_mq_map_swqueue(struct request_queue *q)
/*
* Rule out isolated CPUs from hctx->cpumask to avoid
* running block kworker on isolated CPUs
* running block kworker on isolated CPUs.
* FIXME: cpuset should propagate further changes to isolated CPUs
* here.
*/
rcu_read_lock();
for_each_cpu(cpu, hctx->cpumask) {
if (cpu_is_isolated(cpu))
cpumask_clear_cpu(cpu, hctx->cpumask);
}
rcu_read_unlock();
/*
* Initialize batch roundrobin counts