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

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Date:	Wed, 22 Apr 2009 22:11:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Venky Venkatesh (venky)" <venky@...co.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: Proc entry to know task/thread sleep time

On Wed, 22 Apr 2009 12:41:45 -0700 "Venky Venkatesh (venky)" <venky@...co.com> wrote:

>  
> 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.
> 	 

Do Documentation/accounting/delay-accounting.txt and
Documentation/accounting/getdelays.c suit?
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