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SubjectRe: [RFC PATCH v4] sched: Fix performance regression introduced by mm_cid
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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