linux-kernel - Re: [RFC] x86, perf: Add an aperfmperf driver

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Message-ID: <20150429091450.GQ5029@twins.programming.kicks-ass.net>
Date:	Wed, 29 Apr 2015 11:14:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	Len Brown <len.brown@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [RFC] x86, perf: Add an aperfmperf driver

On Tue, Apr 28, 2015 at 02:25:37PM -0700, Andy Lutomirski wrote:

> +static struct pmu pmu_aperfmperf = {
> +        .task_ctx_nr    = perf_invalid_context,

You could actually have made that perf_sw_context, because its
impossible to fail to add() this event. That will make it possible to
attach it to tasks and you can measure per task a/m-perf.

> +	.attr_groups	= attr_groups,
> +        .event_init     = aperfmperf_event_init,
> +        .add            = aperfmperf_event_add,
> +        .del            = aperfmperf_event_stop_or_del,
> +        .start          = aperfmperf_event_start,
> +        .stop           = aperfmperf_event_stop_or_del,
> +        .read           = aperfmperf_event_update,
> +};
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