linux-kernel - Re: [PATCH v11 14/28] tracing: Add hist trigger support for clearing a trace

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Message-ID: <20151103084301.GB20951@danjae.kornet>
Date:	Tue, 3 Nov 2015 17:43:01 +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 14/28] tracing: Add hist trigger support for clearing
 a trace

On Thu, Oct 22, 2015 at 01:14:18PM -0500, Tom Zanussi wrote:
> Allow users to append 'clear' to an existing trigger in order to have
> the hash table cleared.

Same as the previous comment: It'd be better not creating a new hist
if given hist doesn't exist.

Thanks,
Namhyung


> 
> This expands the hist trigger syntax from this:
>     # echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause/cont \
>            [ if filter] > event/trigger
> 
> to this:
> 
>     # echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause/cont/clear \
>           [ if filter] > event/trigger
> 
> Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
> Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>
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