linux-kernel - Re: [RFC PATCH 3/9] perf: Add ability to dump part of the user stack

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Message-ID: <1286954537.29097.59.camel@twins>
Date:	Wed, 13 Oct 2010 09:22:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>
Subject: Re: [RFC PATCH 3/9] perf: Add ability to dump part of the user
 stack

On Wed, 2010-10-13 at 07:06 +0200, Frederic Weisbecker wrote:
> +++ b/include/linux/perf_event.h
> @@ -227,6 +227,12 @@ struct perf_event_attr {
>         __u32                   bp_type;
>         __u64                   bp_addr;
>         __u64                   bp_len;
> +
> +       __u64                   __reserved_2;
> +       __u64                   __reserved_3;
> +
> +       __u32                   ustack_dump_size;
> +       __u32                   __reserved_4;
>  }; 

Why add those two __u64 fields?
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