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Message-ID: <20240226175028.GA1903@maniforge>
Date: Mon, 26 Feb 2024 11:50:28 -0600
From: David Vernet <void@...ifault.com>
To: peterz@...radead.org
Cc: mingo@...hat.com, linux-kernel@...r.kernel.org, juri.lelli@...hat.com,
vincent.guittot@...aro.org, dietmar.eggemann@....com,
bsegall@...gle.com, bristot@...hat.com, vschneid@...hat.com,
kernel-team@...a.com
Subject: Re: [PATCH v3 0/3] sched/fair: Simplify and optimize
update_sd_pick_busiest()
On Fri, Feb 16, 2024 at 01:44:40PM -0600, David Vernet wrote:
> Hello Peter, hello Ingo,
>
> Friendly ping. Is there anything else required for this to land?
Hello,
Sending another ping.
Thanks,
David
>
> Thanks,
> David
>
> >
> > - In update_sd_lb_stats(), we're using a goto to skip a single if check.
> > Let's remove the goto and just add another condition to the if.
> >
> > - In update_sd_pick_busiest(), only update a group_misfit_task group to
> > be the busiest if it has strictly more load than the current busiest
> > task, rather than >= the load.
> >
> > - When comparing the current struct sched_group with the yet-busiest
> > domain in update_sd_pick_busiest(), if the two groups have the same
> > group type, we're currently doing a bit of unnecessary work for any
> > group >= group_misfit_task. We're comparing the two groups, and then
> > returning only if false (the group in question is not the busiest).
> > Othewise, we break, do an extra unnecessary conditional check that's
> > vacuously false for any group type > group_fully_busy, and then always
> > return true. This patch series has us instead simply return directly
> > in the switch statement, saving some bytes in load_balance().
> >
> > ---
> >
> > v1: https://lore.kernel.org/lkml/20240202070216.2238392-1-void@manifault.com/
> > v2: https://lore.kernel.org/all/20240204044618.46100-1-void@manifault.com/
> >
> > v2 -> v3:
> > - Add Vincent's Reviewed-by tags
> > - Fix stale commit summary sentence (Vincent)
> >
> > v1 -> v2 changes:
> >
> > - Split the patch series into separate patches (Valentin)
> > - Update the group_misfit_task busiest check to use strict inequality
> >
> > David Vernet (3):
> > sched/fair: Remove unnecessary goto in update_sd_lb_stats()
> > sched/fair: Do strict inequality check for busiest misfit task group
> > sched/fair: Simplify some logic in update_sd_pick_busiest()
> >
> > kernel/sched/fair.c | 19 ++++---------------
> > 1 file changed, 4 insertions(+), 15 deletions(-)
> >
> > --
> > 2.43.0
> >
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