Messages in this thread | | | Date | Thu, 19 Mar 2015 13:34:13 -0400 | From | Tejun Heo <> | Subject | serial percpu_ref draining in exit_aio() |
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Hello,
So, Jens noticed that fio process exiting takes seconds when there are multiple aio contexts and the culprit seems to be the serial percpu_ref draining in exit_aio(). It's generally a bad idea to expose RCU latencies to userland because they add up really quickly and are unrelated to other performance parameters. Can you guys please at least update the code so that it waits for all percpu_refs to drain at the same time rather than one after another? That should resolve the worst part of the problem.
Thanks.
-- tejun
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