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05 April 2024, 19:05:47 UTC
Revision 08f5439f1df25a6cf6cf4c72cf6c13025599ce67 authored by Jens Axboe on 22 August 2019, 04:19:11 UTC, committed by Jens Axboe on 22 August 2019, 21:32:28 UTC 
io_uring: add need_resched() check in inner poll loop
 
The outer poll loop checks for whether we need to reschedule, and
returns to userspace if we do. However, it's possible to get stuck
in the inner loop as well, if the CPU we are running on needs to
reschedule to finish the IO work.

Add the need_resched() check in the inner loop as well. This fixes
a potential hang if the kernel is configured with
CONFIG_PREEMPT_VOLUNTARY=y.

Reported-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Tested-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 7035eef
History
Tip revision: 08f5439f1df25a6cf6cf4c72cf6c13025599ce67 authored by Jens Axboe on 22 August 2019, 04:19:11 UTC
io_uring: add need_resched() check in inner poll loop
Tip revision: 08f5439
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