linux-kernel - Re: [PATCH v1 4/6] perf: Allow using AUX data in perf samples

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Message-ID: <20180614193001.GY12217@hirez.programming.kicks-ass.net>
Date:   Thu, 14 Jun 2018 21:30:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-kernel@...r.kernel.org, jolsa@...hat.com
Subject: Re: [PATCH v1 4/6] perf: Allow using AUX data in perf samples

On Tue, Jun 12, 2018 at 10:51:15AM +0300, Alexander Shishkin wrote:
> @@ -416,6 +418,7 @@ struct perf_event_attr {
>  	__u32	aux_watermark;
>  	__u16	sample_max_stack;
>  	__u16	__reserved_2;	/* align to __u64 */
> +	__u64	aux_sample_size;
>  };

Do we really need a __u64 for that? I can see how that __u16 hole might
be too small (512K), but do we really need >4G 'samples' ?