Subject: Re: [patch] Performance Counters for Linux, v3
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Vince Weaver <vince@deater.net>, Ingo Molnar <mingo@elte.hu>,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       Stephane Eranian <eranian@googlemail.com>,
       Eric Dumazet <dada1@cosmosbay.com>,
       Robert Richter <robert.richter@amd.com>,
       Arjan van de Veen <arjan@infradead.org>, Peter Anvin <hpa@zytor.com>,
       Paul Mackerras <paulus@samba.org>,
       "David S. Miller" <davem@davemloft.net>
In-Reply-To: <20081212170336.GJ5413@const.bordeaux.inria.fr>
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Date: Fri, 12 Dec 2008 18:11:50 +0100
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On Fri, 2008-12-12 at 18:03 +0100, Samuel Thibault wrote:
> Peter Zijlstra, le Fri 12 Dec 2008 09:25:45 +0100, a écrit :
> > On Thu, 2008-12-11 at 13:02 -0500, Vince Weaver wrote:
> > > Also, my primary method of using counters is total aggregate count for a 
> > > single user-space process. 
> > 
> > Process, as in single thread, or multi-threaded? I'll assume
> > single-thread.
> 
> BTW, just to make sure it is taken into account (I haven't followed the
> thread up to here, just saw a "pid_t" somwhere that alarmed me): for our
> uses, we _do_ need per-kernelthread counters.

Yes, counters are per task - not sure on the exact interface thingy
though - I guess it should be tid_t but glibc does a bit weird there or
something.

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