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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!
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