linux-kernel - Re: [PATCH RFC V2 3/5] perf,tool: partial time support

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Message-ID: <20150712132225.GA1687@krava.redhat.com>
Date:	Sun, 12 Jul 2015 15:22:25 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, jolsa@...nel.org, namhyung@...nel.org,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC V2 3/5] perf,tool: partial time support

On Tue, Jul 07, 2015 at 06:19:03AM -0400, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> When multiple events are sampled it may not be needed to collect fine
> grained time stamps on all events. The sample sites are usually nearby.
> It's enough to have time stamps on the regular reference events.
> This patchkit adds the ability to turn off time stamps per event. This
> in term can reduce sampling overhead and the size of the perf.data.

how is this usable in some perf example? I dont get the correlation
between 'refference' and the rest of the events in the report time..

thanks,
jirka
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