linux-kernel - Re: [PATCH] perf tool: Round mmap pages to power 2

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Date:	Mon, 11 Nov 2013 11:59:08 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf tool: Round mmap pages to power 2

Em Mon, Nov 11, 2013 at 12:27:54PM +0100, Ingo Molnar escreveu:
> * David Ahern <dsahern@...il.com> wrote:
> 
> > Currently perf requires the -m / --mmap_pages option to be a power of 2.
> > To be more user friendly perf should automatically round this up to the
> > next power of 2.
> > 
> > Currently:
> >   $ perf record -m 3 -a -- sleep 1
> >   --mmap_pages/-m value must be a power of two.sleep: Terminated
> > 
> > With patch:
> >   $ perf record -m 3 -a -- sleep 1
> >   rounding mmap pages size to 16384 (4 pages)
> 
> Please add 'bytes'.

Ok, waiting for v2 with this and Adrian's concerns addressed.

- Arnaldo
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