linux-kernel - Re: [RFC][PATCH] perf: Rewrite enabled/running timekeeping

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Date:   Tue, 5 Sep 2017 11:44:17 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>,
        Valery Cherepennikov <valery.cherepennikov@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Vince Weaver <vince@...ter.net>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH] perf: Rewrite enabled/running timekeeping

On Tue, Sep 05, 2017 at 12:51:35AM -0700, Stephane Eranian wrote:
> >> Esp the cgroup stuff is entirely untested since I simply don't know how
> >> to operate that. I did run Vince's tests on it, and I think it doesn't
> >> regress, but I'm near a migraine so I can't really see straight atm.
> >>
> >> Vince, Stephane, could you guys have a peek?
> >>
> > okay, I will run some tests with cgroups on my systems.
> >
> I ran some cgroups tests, including multiplexing and so far it appears to work
> normally.

Shiny!

> It is easy to create a cgroup and move a shell into it:
> $ mount -t cgroup none /sys/fs/cgroups
> $ cd /sys/fs/cgroups/perf_events
> $ mkdir memtoy
> $ cd memtoy
> $ echo $$ >tasks
> 
> At this point your shell is part of the cgroup.
> Then you can use perf to monitor globally or inside the cgroup:
> 
> $ perf stat -a -e cycles,cycles -G memtoy -I 1000 sleep 1000
> 
> That monitors cycles on all CPUs twice, once only when a member
> of the cgroup memtoy runs, and the other globally.

Right, thanks!