Messages in this thread | | | Date | Wed, 12 Apr 2023 16:26:16 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH v4] sched: Fix performance regression introduced by mm_cid |
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On Wed, Apr 12, 2023 at 07:42:40PM +0800, Aaron Lu wrote:
> I *guess* you might be able to see some contention with hackbench on > that HSW-EX system with v4.
Indeed! Notably it seems to be the wakeup from idle that trips it hardest:
11.31% 0.03% swapper [kernel.vmlinux] [k] schedule_idle | --11.28%--schedule_idle | --11.27%--__schedule | |--8.61%--mm_cid_get | | | --5.78%--_raw_spin_lock | | | --5.56%--native_queued_spin_lock_slowpath | |--0.81%--finish_task_switch.isra.0 | | | --0.69%--asm_sysvec_call_function_single | | | --0.58%--sysvec_call_function_single | --0.57%--switch_mm_irqs_off
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