From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: How to trace threads created by a process after perf has started
 recording, using the -p PID flag?
Date: Sat, 22 Sep 2012 12:39:13 -0600
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To: Mikolaj Konarski <mikolaj.konarski@gmail.com>
Cc: linux-perf-users@vger.kernel.org, Bernie Pope <florbitous@gmail.com>, Duncan Coutts <duncan@well-typed.com>

On 9/22/12 1:58 AM, Mikolaj Konarski wrote:
> Are we missing anything? Is the "--timestamp" option of perf-record
> related in any way? Any other tips?

That option adds the timestamps to the samples if it were not otherwise 
added.

>
> We're working around right now by syncing with a timestamp
> of a known event, but that leaves us vulnerable to a time drift.
> If there's no way currently to generate externally meaningful
> timestamps, could we file a feature request for the sake of the future?

You mean like this: https://lkml.org/lkml/2011/6/7/638

David