linux-kernel - Re: [PATCH v11 22/28] tracing: Add enable_hist/disable

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Message-ID: <20151103085555.GC20951@danjae.kornet>
Date:	Tue, 3 Nov 2015 17:55:55 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:	rostedt@...dmis.org, daniel.wagner@...-carit.de,
	masami.hiramatsu.pt@...achi.com, josh@...htriplett.org,
	andi@...stfloor.org, mathieu.desnoyers@...icios.com,
	peterz@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 22/28] tracing: Add enable_hist/disable_hist triggers

On Thu, Oct 22, 2015 at 01:14:26PM -0500, Tom Zanussi wrote:
> Similar to enable_event/disable_event triggers, these triggers enable
> and disable the aggregation of events into maps rather than enabling
> and disabling their writing into the trace buffer.
> 
> They can be used to automatically start and stop hist triggers based
> on a matching filter condition.
> 
> If there's a paused hist trigger on system:event, the following would
> start it when the filter condition was hit:
> 
>   # echo enable_hist:system:event [ if filter] > event/trigger
> 
> And the following would disable a running system:event hist trigger:
> 
>   # echo disable_hist:system:event [ if filter] > event/trigger

What about named hist triggers?  Maybe worth adding
"enable/disable_hist_name" too?

Thanks,
Namhyung


> 
> See Documentation/trace/events.txt for real examples.
> 
> Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
> Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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