linux-kernel - Re: re-enable Nehalem raw Offcore-Events support

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Date:	Sun, 1 May 2011 20:00:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pekka Enberg <penberg@...nel.org>,
	Vince Weaver <vweaver1@...s.utk.edu>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...il.com>,
	Carl Love <carll@...ibm.com>
Subject: Re: re-enable Nehalem raw Offcore-Events support


* Andi Kleen <ak@...ux.intel.com> wrote:

> > I would say that most if not all of the events are not generalizable
> > in the sense that you are talking about; the events are very
> > specific to the Torrent chip.  For example, the Torrent chip
> 
> It's similar also on Intel chips. [...]

You seem to be seriously misinformed about Intel CPUs.

There are a fair number of events on Intel CPUs that can be generalized and 
which we have already generalized. Here's a selection:

 Performance counter stats for './fill_1b':

       2829.562519 task-clock               #    0.994 CPUs utilized          
                27 context-switches         #    0.000 M/sec                  
                52 CPU-migrations           #    0.000 M/sec                  
                99 page-faults              #    0.000 M/sec                  
     8,559,062,611 cycles                   #    3.025 GHz                      (20.02%)
     2,530,761,381 stalled-cycles-frontend  #   29.57% frontend cycles idle     (30.03%)
       423,070,037 stalled-cycles-backend   #    4.94% backend  cycles idle     (40.04%)
    18,043,436,126 instructions             #    2.11  insns per cycle        
                                            #    0.14  stalled cycles per insn  (50.04%)
     1,007,704,770 branches                 #  356.134 M/sec                    (60.04%)
           521,894 branch-misses            #    0.05% of all branches          (60.02%)
         9,424,849 L1-dcache-loads          #    3.331 M/sec                    (50.03%)
         1,028,884 L1-dcache-load-misses    #   10.92% of all L1-dcache hits    (50.02%)
           490,266 LLC-loads                #    0.173 M/sec                    (39.99%)
           133,226 LLC-load-misses          #    0.047 M/sec                    (10.01%)

        2.846836822  seconds time elapsed

Thanks,

	Ingo
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