Re: [perfmon] Re: cpuinfo_x86 and apicid

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Jul 06, 2006 at 03:37:45PM -0700, Stephane Eranian wrote:
> Suresh,
> 
> On Thu, Jul 06, 2006 at 03:25:43PM -0700, Stephane Eranian wrote:
> > > 
> > Ah, yes I missed that. It works there two. I had something wrong
> > about how I accessed cpu_data. I am used to the elegant way we
> > do it on IA-64 but on x86_64 you have to index the cpu_data[]
> > array with smp_processor_id(). I was pointing to cpu_data[0]
> > on all processors.
> > 
> > For what I need, I can do cpuinfo_x86->apicid & 0x3 to identify
> > which thread is running. I can now remove some more code in perfmon2.
> > 
> I meant cpuinfo_x86->apicid & 0x1.

Instead of hard coding, can you get the size of the mask runtime from the
size of cpu_sibling_map[cpu]

And remember, physical/logical hotplug can change this sibling map.

thanks,
suresh
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux