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Date: Wed, 6 Feb 2013 13:48:40 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: David Ahern <dsahern@gmail.com>
Cc: linux-kernel@vger.kernel.org,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>, Ingo Molnar <mingo@elte.hu>,
        Paul Mackerras <paulus@samba.org>,
        Corey Ashford <cjashfor@linux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Namhyung Kim <namhyung@kernel.org>, Andrew Jones <drjones@redhat.com>
Subject: Re: [PATCH 2/2] perf scripts: Fix rwtop record script
Message-ID: <20130206124840.GA11700@krava.redhat.com>
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On Tue, Feb 05, 2013 at 09:15:20AM -0700, David Ahern wrote:
> On 2/5/13 9:05 AM, Jiri Olsa wrote:
> >Adding -D option into the rwtop record command line, to get
> >immediate response when there's event in the buffer.
> 
> Seems like this will dramatically increase CPU usage of perf-record
> as well as increase the overhead of each event with a process
> wakeup. How about a poll option on perf-record to have it wake up at
> a given rate instead?

right, I'll check

thanks,
jirka