linux-kernel - RFC: /proc/<pid>/sched should contain cumulative data for all threads in process

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Date:	Mon, 07 Feb 2011 16:29:15 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RFC: /proc/<pid>/sched should contain cumulative data for all threads
 in process

Hi,

We've got a tool that gathers lots of scheduling data for each process
(not task/thread) on the system.

For /proc/<pid>/{stat,io} this is straightforward, as the per-thread
values are summed together for the process as a whole.

However, /proc/<pid>/sched only shows the data for the individual thread
with the same tid as the pid.  To get a per-process view we need to
manually scan all the threads and sum them--and this can get expensive
due to all the extra file operations, parsing, etc.

Was this a concious design decision, or just an oversight?  Would a
patch converting it to whole-process values be accepted or is it enough
of a standard interface that we can't break existing apps that expect
the current behaviour?

Thanks,
Chris

-- 
Chris Friesen
Software Developer
GENBAND
chris.friesen@...band.com
www.genband.com
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