Re: [perfmon2] Uncore counting problem with libpfm4 on Nehalem

[stephane e. <er...@go...>]

Min,

I have fixed libpfm4 to return an error when you call
pfm_get_perf_event_encoding() on Intel Nehalem uncore events.

Just pull from the GIT tree.


On Wed, Oct 14, 2009 at 8:52 PM, stephane eranian
<er...@go...> wrote:
> Min,
>
> On Wed, Oct 14, 2009 at 7:51 PM, Min Lim <my...@re...> wrote:
>> Hello,
>>
>> With libpfm4, I try to count a few uncore events (e.g. UNC_CLK_UNHALTED)
>> on Intel Nehalem machine (linux kernel 2.6.32-rc4). But, they all return
>> "0". The core event counting work well. So, I am wondering whether the
>> libpfm4 does support the uncore event. Maybe, the kernel does not
>> support it yet. Please let me know if you have any information about it.
>>
> That's normal. I seem to remember I said that uncore PMU support is there
> in libpfm4 but NOT in perf_events. The issue you're running into is that no
> error is returned or you're ignoring it. You have to wait until there is uncore
> PMU support in the kernel.
>