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

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Message-ID: <20150319142750.GH162412@redhat.com>
Date:	Thu, 19 Mar 2015 10:27:50 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	David Ahern <dsahern@...il.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 Thu, Mar 19, 2015 at 07:56:32AM -0600, David Ahern wrote:
> 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).

Hmm, I wonder if this is going to break our threading example.  Perhaps not,
now that Jiri made some other changes later.  Feel free to post a patch, cc
me please.  I will patch our perf over here and have Joe Mario run some
tests to see if we lose any data or not and let you know.

Cheers,
Don
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