Re: [patch] Performance Counters for Linux, v2

[Corey J Ashford]

linux-kernel-owner@xxxxxxxxxxxxxxx wrote on 12/07/2008 05:22:12 PM:
[snip]
> 
> The other big change is the support of virtual task counters via counter 

> scheduling: a task can specify more counters than there are on the CPU, 
> the kernel will then schedule the counters periodically to spread out hw 

> resources. So for example if a task starts 6 counters on a CPU that has 
> only two hardware counters, it still gets this output:
> 
>  counter[0 cycles              ]:   5204680573 , delta:   1733680843 
events
>  counter[1 instructions        ]:   1364468045 , delta:    454818351 
events
>  counter[2 cache-refs          ]:        12732 , delta:         4399 
events
>  counter[3 cache-misses        ]:         1009 , delta:          336 
events
>  counter[4 branch-instructions ]:    125993304 , delta:     42006998 
events
>  counter[5 branch-misses       ]:         1946 , delta:          649 
events
>

Hello Ingo,

I posted some questions about this capability in your proposal on LKML, 
but I wasn't able to get the reply threaded in properly.  Could you take a 
look at this post, please?

http://lkml.org/lkml/2008/12/5/299

Thanks for your consideration,

- Corey

Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR 
503-578-3507 
cjashfor@xxxxxxxxxx
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