Re: [RFC PATCH v8] sched: Fix performance regression introduced by mm_cid

[Aaron Lu]

On Mon, Apr 17, 2023 at 11:08:31AM -0400, Mathieu Desnoyers wrote:
> Introduce per-mm/cpu current concurrency id (mm_cid) to fix a PostgreSQL
> sysbench regression reported by Aaron Lu.

For postgres_sysbench on SPR:
sched_mm_cid_migrate_to() is in the range of 0.1x% - 0.4x%, mm_cid_get()
is in the range of 0.1x% - 0.3x%. Other cid functions are pretty minor.

For hackbench on SPR:
ched_mm_cid_migrate_to() is about 3%-4%, mm_cid_get() is about 7%-8%,
other cid functions are pretty minor.

Thanks,
Aaron