Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: io_uring vs CPU hotplug, was Re: [PATCH 5/9] blk-mq: don't set data->ctx and data->hctx in blk_mq_alloc_request_hctx | Date | Wed, 20 May 2020 21:41:05 +0200 |
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Jens Axboe <axboe@kernel.dk> writes: > On 5/20/20 8:45 AM, Jens Axboe wrote: >> It just uses kthread_create_on_cpu(), nothing home grown. Pretty sure >> they just break affinity if that CPU goes offline. > > Just checked, and it works fine for me. If I create an SQPOLL ring with > SQ_AFF set and bound to CPU 3, if CPU 3 goes offline, then the kthread > just appears unbound but runs just fine. When CPU 3 comes online again, > the mask appears correct.
When exactly during the unplug operation is it unbound?
Thanks,
tglx
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