linux-kernel - Re: [PATCH] Read THREAD_CPUTIME clock from other processes.

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Message-Id: <20101223092108.3f28d853.rdunlap@xenotime.net>
Date:	Thu, 23 Dec 2010 09:21:08 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Dario Faggioli <raistlin@...ux.it>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	torbenh <torbenh@....de>, oleg <oleg@...hat.com>,
	john.stultz@...aro.org, roland@...hat.com,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] Read THREAD_CPUTIME clock from other  processes.

On Thu, 23 Dec 2010 17:21:43 +0100 Dario Faggioli wrote:

> Trying to read CLOCK_THREAD_CPUTIME_ID of a thread from outside
> the process that spawned it with this code:
> 
>         if (clock_getcpuclockid(tid, &clockid) != 0) {
>                 perror("clock_getcpuclockid");
>                 exit(EXIT_FAILURE);
>         }
> 
> results in this:
>   ### Testing tid 24207: CPU-time clock for PID 24207 is 1.132371729 seconds
>   ### Testing tid 24209: clock_getcpuclockid: Success
> 
> OTH, if full-fledged processes are involved, the behaviour is this:
>   ### Testing tid 24218: CPU-time clock for PID 24218 is 0.001059305 seconds
>   ### Testing tid 24220: CPU-time clock for PID 24220 is 1.044057391 seconds
> 
> Test programs available here: http://gitorious.org/clockid.


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---
~Randy
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