linux-kernel - Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU

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Message-ID: <20160804144325.GP6862@twins.programming.kicks-ass.net>
Date:	Thu, 4 Aug 2016 16:43:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Carrillo-Cisneros <davidcc@...gle.com>
Cc:	linux-kernel@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...ux.intel.com>,
	Kan Liang <kan.liang@...el.com>, Paul Turner <pjt@...gle.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and
 PMUEF_READ_CPU_PKG

On Mon, Aug 01, 2016 at 07:44:54PM -0700, David Carrillo-Cisneros wrote:
> +++ b/include/linux/perf_event.h
> @@ -681,9 +681,21 @@ struct perf_event {
>  #endif
>  
>  	struct list_head		sb_list;
> +
> +	/* Per-event flags to generic code set by PMU. */
> +	int				pmu_event_flags;
> +

It appears to me we already have group_flags and attach_state which both
are serialized by ctx->lock.

Could we maybe merge the lot into one flags field?