linux-kernel - Re: [PATCH v3 00/10] Optimize cgroup context switch

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Message-ID: <CAP-5=fU9b-qTH=whjfpkPjnUJQQTmtjZ3GFT5zYEnJ69gGO4+Q@mail.gmail.com>
Date:   Thu, 14 Nov 2019 10:17:01 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Petr Mladek <pmladek@...e.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Qian Cai <cai@....pw>, Joe Lawrence <joe.lawrence@...hat.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Gary Hook <Gary.Hook@....com>, Arnd Bergmann <arnd@...db.de>,
        Kan Liang <kan.liang@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v3 00/10] Optimize cgroup context switch

On Thu, Nov 14, 2019 at 2:45 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Wed, Nov 13, 2019 at 04:30:32PM -0800, Ian Rogers wrote:
> > Avoid iterating over all per-CPU events during cgroup changing context
> > switches by organizing events by cgroup.
>
> When last we spoke (Plumbers in Lisbon) you mentioned that this
> optimization was yielding far less than expected. You had graphs showing
> how the use of cgroups impacted event scheduling time and how this patch
> set only reduced that a little.
>
> Any update on all that? There seems to be a conspicuous lack of such
> data here.

I'm working on giving an update on the numbers but I suspect they are
better than I'd measured ahead of LPC due to a bug in a script.

Thanks,
Ian