linux-kernel - Re: [RFC][PATCH] perf: Implement read

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Date:	Sun, 22 Feb 2015 16:04:48 -0500
From:	Cody P Schafer <dev@...yps.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Anton Blanchard <anton@....ibm.com>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] perf: Implement read_group() PMU operation

On Thu, Feb 5, 2015 at 9:59 PM, Sukadev Bhattiprolu
<sukadev@...ux.vnet.ibm.com> wrote:
> From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
> Date: Thu Feb  5 20:56:20 EST 2015 -0300
> Subject: [RFC][PATCH] perf: Implement read_group() PMU operation
>
> This is a lightly tested, exploratory patch to allow PMUs to return
> several counters at once. Appreciate any comments :-)
>

Back when I was fiddling with this, I started looking into changing
the {start,commit,cancel}_txn to operate on (struct perf_event *)
rather than (struct pmu *), and commit_txn would generate the actual
request & reads based on the perf_event's group (sounds similar but
not identical to what Peter's proposed previously).

The key bit I was concerned about was that these "PMUs" aren't
actually physical hw, so it made a bit more sense to pin the grouping
to a group rather than a txn over a PMU.

[Of course, I never did confirm if that actually fit with how perf was
modeling txns]
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