linux-kernel - Re: [PATCH v3 1/4] perf: add active_entry list head to struct perf

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Message-ID: <20131025145625.GB1196@krava.brq.redhat.com>
Date:	Fri, 25 Oct 2013 16:56:25 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, zheng.z.yan@...el.com,
	bp@...en8.de
Subject: Re: [PATCH v3 1/4] perf: add active_entry list head to struct
 perf_event

On Wed, Oct 23, 2013 at 02:58:02PM +0200, Stephane Eranian wrote:
> This patch adds a new fields to the struct perf_event.
> It is intended to be used to chain events which are
> active (enabled). It helps in the hardware layer
> for PMU which do not have actual counter restrictions, i.e.,
> free running read-only counters. Active events are chained
> as opposed to being tracked via the counter they use.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>  include/linux/perf_event.h |    1 +
>  kernel/events/core.c       |    1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 2e069d1..a376384 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -435,6 +435,7 @@ struct perf_event {
>  	struct perf_cgroup		*cgrp; /* cgroup event is attach to */
>  	int				cgrp_defer_enabled;
>  #endif
> +	struct list_head		active_entry;

Could this be in union with 'hlist_entry' ? It looks
as 'same purpose' and 'mutualy exclusive stuff.

jirka
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