linux-kernel - Re: [PATCH] perf: fix raw sample size if no sampling data is attached

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Message-ID: <20100507194833.GY6450@erda.amd.com>
Date:	Fri, 7 May 2010 21:48:33 +0200
From:	Robert Richter <robert.richter@....com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: fix raw sample size if no sampling data is
 attached

On 07.05.10 17:28:35, Robert Richter wrote:
> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index 9dbe8cd..f6ddae9 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -3229,7 +3229,7 @@ void perf_output_sample(struct perf_output_handle *handle,
>  				u32	size;
>  				u32	data;
>  			} raw = {
> -				.size = sizeof(u32),
> +				.size = 0,
>  				.data = 0,

Uhhh, this padding data was completly hidden to me by a SEP field. It
became visible to me with a far distance of at least 4km and only from
the corner of my eye. So, *now* I realized that size is the size of
padding data, not the size header! Please ignore this, I shouln't send
patches at Friday afternoon.

-Robert

>  			};
>  			perf_output_put(handle, raw);

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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