linux-kernel - Proc entry to know task/thread sleep time

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Message-ID: <9E88C8678BF34240A8C61D4078A3D251F7940F@xmb-sjc-23e.amer.cisco.com>
Date:	Wed, 22 Apr 2009 12:41:45 -0700
From:	"Venky Venkatesh (venky)" <venky@...co.com>
To:	<linux-kernel@...r.kernel.org>
Subject:  Proc entry to know task/thread sleep time

Hi,
I am looking for any proc entry/tool which would provide the time for
which a thread/task has been sleeping. The use of this is the following:
I have a multi-threaded application and I am trying to determine the
extent of multi-processing between threads i.e. determine how much time
threads spend on blocking for resources/each other Vs doing productive
work. 
If the above is available, is there an additional info on
time-waiting-on-io (i.e. a subset of the above sleep time) that is also
available thru a proc entry/tool? This would find use in a server like
application where if all the current threads are spending most of their
time waiting on I/O then can add more threads.
In general if there is a proc entry which accounts for time spent by a
thread in various states that could also help.

Thanx
-Venky

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