From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Kyle Meyer <kyle.meyer@hpe.com>
Cc: linux-kernel@vger.kernel.org, yury.norov@gmail.com,
linux@rasmusvillemoes.dk, mingo@redhat.com, peterz@infradead.org,
juri.lelli@redhat.com, vincent.guittot@linaro.org,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, bristot@redhat.com,
vschneid@redhat.com, russ.anderson@hpe.com,
dimitri.sivanich@hpe.com, steve.wahl@hpe.com
Subject: Re: [PATCH v2 2/2] sched/topology: Optimize topology_span_sane()
Date: Thu, 11 Apr 2024 13:38:46 +0300 [thread overview]
Message-ID: <Zhe9ttm9Ppv2wT3S@smile.fi.intel.com> (raw)
In-Reply-To: <20240410213311.511470-3-kyle.meyer@hpe.com>
On Wed, Apr 10, 2024 at 04:33:11PM -0500, Kyle Meyer wrote:
> Optimize topology_span_sane() by removing duplicate comparisons.
>
> Since topology_span_sane() is called inside of for_each_cpu(), each
> pervious CPU has already been compared against every other CPU. The
previous
> current CPU only needs to be compared against higher-numbered CPUs.
>
> The total number of comparisons is reduced from N * (N - 1) to
> N * (N - 1) / 2 on each non-NUMA scheduling domain level.
Thank you, now it makes sense.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2024-04-11 10:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-10 21:33 [PATCH v2 0/2] " Kyle Meyer
2024-04-10 21:33 ` [PATCH v2 1/2] cpumask: Add for_each_cpu_from() Kyle Meyer
2024-04-15 11:50 ` Valentin Schneider
2024-04-10 21:33 ` [PATCH v2 2/2] sched/topology: Optimize topology_span_sane() Kyle Meyer
2024-04-11 10:38 ` Andy Shevchenko [this message]
2024-04-11 21:55 ` Kyle Meyer
2024-04-12 14:25 ` Andy Shevchenko
2024-04-13 17:42 ` Yury Norov
2024-04-15 11:50 ` Valentin Schneider
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Zhe9ttm9Ppv2wT3S@smile.fi.intel.com \
--to=andriy.shevchenko@linux.intel.com \
--cc=bristot@redhat.com \
--cc=bsegall@google.com \
--cc=dietmar.eggemann@arm.com \
--cc=dimitri.sivanich@hpe.com \
--cc=juri.lelli@redhat.com \
--cc=kyle.meyer@hpe.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@rasmusvillemoes.dk \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=russ.anderson@hpe.com \
--cc=steve.wahl@hpe.com \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.com \
--cc=yury.norov@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®