linux-kernel - Re: How about limiting refresh ioctl to sampling events ?

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Message-ID: <1290517646.2072.403.camel@laptop>
Date:	Tue, 23 Nov 2010 14:07:26 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Franck Bui-Huu <vagabon.xyz@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: How about limiting refresh ioctl to sampling events ?

On Tue, 2010-11-23 at 14:01 +0100, Franck Bui-Huu wrote:
> Hello Peter,
> 
> I'm looking at the perf event stuff and wondering if
> perf_event_refresh() should be limited to sampling events.
> 
> Does the following make sense ?
> 
> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index 3b105e0..1a90a6c 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -1072,7 +1072,7 @@ static int perf_event_refresh(struct perf_event *event, int refresh)
>  	/*
>  	 * not supported on inherited events
>  	 */
> -	if (event->attr.inherit)
> +	if (event->attr.inherit || !event->attr.sample_period)
>  		return -EINVAL;
>  
>  	atomic_add(refresh, &event->event_limit);

Yes it does, please submit as a proper patch.
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