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Subject: Re: Q: perf log mode?
From: Peter Zijlstra <peterz@infradead.org>
To: Kirill Smelkov <kirr@mns.spb.ru>
Cc: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo <acme@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@elte.hu>,
        Mike Galbraith <efault@gmx.de>, Paul Mackerras <paulus@samba.org>,
        Stephane Eranian <eranian@google.com>,
        Tom Zanussi <tzanussi@gmail.com>
In-Reply-To: <20110112140613.GA11698@tugrik.mns.mnsspb.ru>
References: <20110112140613.GA11698@tugrik.mns.mnsspb.ru>
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Date: Wed, 12 Jan 2011 15:08:08 +0100
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On Wed, 2011-01-12 at 17:06 +0300, Kirill Smelkov wrote:
> I'm trying to use perf together with e.g. kprobes as a tool to show what
> is happening with my system in "live-log" mode. The problem is, for
> seldom events, actual info output is largely delayed because perf reads
> sample data in whole pages. Could something be done with it or am I'm
> missing something? Here is detailed description: 

perf_event_attr = {
	.watermark = 0,
	.wakeup_events = 1,
};