linux-kernel - Re: perf: thread is its own parent

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Date:	Thu, 19 Mar 2015 07:56:32 -0600
From:	David Ahern <dsahern@...il.com>
To:	Don Zickus <dzickus@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf: thread is its own parent

On 3/19/15 7:20 AM, Don Zickus wrote:
> Honestly I don't recall.   The commit log tells you the problem I was trying
> to solve.  Instead of parsing text strings from/proc/maps/<pid>, I believe
> it was waaaay faster to copy the thread maps.
>
> This could have been an oversight.  I might have falsely assumed tgid ==
> ppid?
>
> Are you finding a problem with it?


rebasing my scheduling timehist command to 4.0 and this change breaks 
one of the options. If there are no objections I'll send a patch along 
with others to set ptid and ppid to -1 (that's what it is in 3.12).

Thanks,
David
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