Date: Thu, 16 Apr 2015 20:55:59 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
        linux-man@vger.kernel.org, linux-kernel@vger.kernel.org,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Stephane Eranian <eranian@google.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Borislav Petkov <bp@alien8.de>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Kaixu Xia <kaixu.xia@linaro.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mike Galbraith <efault@gmx.de>, Robert Richter <rric@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, adrian.hunter@intel.com,
        kan.liang@intel.com, markus.t.metzger@intel.com,
        mathieu.poirier@linaro.org
Subject: Re: [patch 05/10] perf_event_open.2: aux_{head,tail,offset,size}
 support
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On Thu, Apr 16, 2015 at 02:15:52PM -0400, Vince Weaver wrote:
> +.I aux_size
> +needs to be set to the desired buffer size.
> +The desired offset and size must be page aligned.

I think we also require the size to be a power of two.

> +These values are then passed to mmap in order to map the AUX buffer.
> +Pages in the AUX buffer are included as part of the user mlock
> +rlimit as well as the
> +.I perf_event_mlock_kb
> +allowance.
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