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Subject: Re: [RFC PATCH 3/9] perf: Add ability to dump part of the user
 stack
From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
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Date: Wed, 13 Oct 2010 09:22:17 +0200
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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?