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Message-ID: <20230414030624.GB250825@ziqianlu-desk2>
Date: Fri, 14 Apr 2023 11:06:24 +0800
From: Aaron Lu <aaron.lu@...el.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: Peter Zijlstra <peterz@...radead.org>,
<linux-kernel@...r.kernel.org>, Olivier Dion <odion@...icios.com>,
<michael.christie@...cle.com>
Subject: Re: [RFC PATCH v5] sched: Fix performance regression introduced by
mm_cid
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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