Messages in this thread | | | Date | Fri, 14 Apr 2023 11:06:24 +0800 | From | Aaron Lu <> | Subject | Re: [RFC PATCH v5] sched: Fix performance regression introduced by mm_cid |
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On Thu, Apr 13, 2023 at 10:37:44PM +0800, Aaron Lu wrote: > On Thu, Apr 13, 2023 at 10:02:48AM -0400, Mathieu Desnoyers wrote: > > Introduce per-mm/cpu current concurrency id (mm_cid) to fix a PostgreSQL > > sysbench regression reported by Aaron Lu. > > Initial test using postgres_sysbench showed the lock contention is gone :-) > Will check how it affects hackbench tomorrow.
For hackbench on SPR, there is also almost no lock contention from scheduler path. For cid related function, there are:
# Children Self Shared Object Symbol 7.10% 7.09% [kernel.vmlinux] [k] mm_cid_get 3.62% 3.53% [kernel.vmlinux] [k] sched_mm_cid_migrate_from
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