From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
linux-kernel@vger.kernel.org, kernel-team@fb.com,
alexey.budankov@linux.intel.com
Subject: Re: [RFC] Sharing PMU counters across compatible events
Date: Wed, 13 Dec 2017 08:18:29 -0800 [thread overview]
Message-ID: <20171213161829.GV3919388@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <20171212223736.llqgzpit4n2klhwg@hirez.programming.kicks-ass.net>
Hello, Peter.
On Tue, Dec 12, 2017 at 11:37:36PM +0100, Peter Zijlstra wrote:
> That would be a fairly massive change from how perf works today. And the
> obvious pain point would be changing the per-cpu event set, which would
> mean recomputing all possible combinations of task sets.
>
> Also note that each context (cpu,task) is allowed to have more events
> than fit on the PMU, at which point we'll start rotating events. Do we
> also pre-compute all possible rotation sets?
>
> Just not quite seeing this..
Yeah, right. Will think more about it
Thanks.
--
tejun
prev parent reply other threads:[~2017-12-13 16:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 14:19 [RFC] Sharing PMU counters across compatible events Tejun Heo
2017-12-06 11:42 ` Jiri Olsa
2017-12-11 15:34 ` Tejun Heo
2017-12-13 10:18 ` Jiri Olsa
2017-12-13 16:15 ` Tejun Heo
2017-12-06 12:35 ` Peter Zijlstra
2017-12-11 15:47 ` Tejun Heo
2017-12-12 22:37 ` Peter Zijlstra
2017-12-13 16:18 ` Tejun Heo [this message]
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