linux-kernel - Re: [PATCH v2] sched: Optimize __calc

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Date:   Thu, 4 Mar 2021 17:04:51 -0800
From:   Josh Don <joshdon@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Clement Courbet <courbet@...gle.com>,
        Oleg Rombakh <olegrom@...gle.com>,
        Bill Wendling <morbo@...gle.com>, sedat.dilek@...il.com
Subject: Re: [PATCH v2] sched: Optimize __calc_delta.

On Thu, Mar 4, 2021 at 9:34 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
>
> Hi Josh, Thanks for helping get this patch across the finish line.
> Would you mind updating the commit message to point to
> https://bugs.llvm.org/show_bug.cgi?id=20197?

Sure thing, just saw that it got marked as a dup.

Peter, since you've already pulled the patch, can you modify the
commit message directly? Nick also recommended dropping the
punctuation in the commit oneline.

> >  #include <linux/binfmts.h>
> > +#include <linux/bitops.h>
>
> This hunk of the patch is curious.  I assume that bitops.h is needed
> for fls(); if so, why not #include it in kernel/sched/fair.c?
> Otherwise this potentially hurts compile time for all TUs that include
> kernel/sched/sched.h.

bitops.h is already included in sched.h via another include, so this
was just meant to make it more explicit. Motivation for putting it
here vs. fair.c was 325ea10c080940.