linux-kernel - Re: [RFC PATCH 06/17] perf: Add buffers to the detached events

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Message-ID: <20171003143602.hg2rbwne4e22g46h@hirez.programming.kicks-ass.net>
Date:   Tue, 3 Oct 2017 16:36:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        acme@...hat.com, kirill.shutemov@...ux.intel.com,
        Borislav Petkov <bp@...en8.de>, rric@...nel.org
Subject: Re: [RFC PATCH 06/17] perf: Add buffers to the detached events

On Tue, Sep 05, 2017 at 04:30:15PM +0300, Alexander Shishkin wrote:
> @@ -415,6 +416,8 @@ struct perf_event_attr {
>  	__u32	aux_watermark;
>  	__u16	sample_max_stack;
>  	__u16	__reserved_2;	/* align to __u64 */
> +	__u32	detached_nr_pages;
> +	__u32	detached_aux_nr_pages;
>  };

Not sure the naming makes sense; I don't see why this would be limited
to detached events. That is, what would stop someone from pre-allocating
buffers on 'regular' events if they wanted to?