Corey,
On Tue, Jun 23, 2009 at 12:04 AM, Corey
Ashford wrote:
> stephane eranian wrote:
>>
>> On Mon, Jun 22, 2009 at 1:50 PM, Ingo Molnar wrote:
2/ Grouping
By design, an event can only be part of one group at a time.
>>
>> As I read this again, another question came up. Is th
stephane eranian wrote:
> On Tue, Jun 23, 2009 at 10:26 AM, Paul Mackerras wrote:
>> stephane eranian writes:
>>
>>> What happens if I do:
>>>fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0);
>>>fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0);
>>>
>>> And then:
>>>fd2 = perf_cou
On Tue, Jun 23, 2009 at 10:26 AM, Paul Mackerras wrote:
> stephane eranian writes:
>
>> What happens if I do:
>> fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0);
>> fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0);
>>
>> And then:
>> fd2 = perf_counter_open(&hwc2, getpid(), -1, fd1
stephane eranian writes:
> What happens if I do:
>fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0);
>fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0);
>
> And then:
>fd2 = perf_counter_open(&hwc2, getpid(), -1, fd1, 0);
That perf_counter_open call will fail with an EINVAL erro
On Tue, Jun 23, 2009 at 7:16 AM, Paul Mackerras wrote:
> Ingo Molnar writes:
>
>> > 2/ Grouping
>> >
>> > By design, an event can only be part of one group at a time.
>
> To clarify this statement of Stephane's, a _counter_ can only be in
> one group. You can have multiple counters counting the sa
Ingo Molnar writes:
> > 2/ Grouping
> >
> > By design, an event can only be part of one group at a time.
To clarify this statement of Stephane's, a _counter_ can only be in
one group. You can have multiple counters counting the same _event_
and those counters can (obviously) be in different grou
stephane eranian wrote:
> On Mon, Jun 22, 2009 at 1:50 PM, Ingo Molnar wrote:
>>> 2/ Grouping
>>>
>>> By design, an event can only be part of one group at a time.
>
> As I read this again, another question came up. Is the statement
> above also true for the group leader?
>
>
>>> Events in a grou
Ingo Molnar wrote:
>> 2/ Grouping
>>
>> By design, an event can only be part of one group at a time.
>> Events in a group are guaranteed to be active on the PMU at the
>> same time. That means a group cannot have more events than there
>> are available counters on the PMU. Tools may want to know
On Mon, Jun 22, 2009 at 1:50 PM, Ingo Molnar wrote:
>> 2/ Grouping
>>
>> By design, an event can only be part of one group at a time.
As I read this again, another question came up. Is the statement
above also true for the group leader?
>> Events in a group are guaranteed to be active on the PMU
> 2/ Grouping
>
> By design, an event can only be part of one group at a time.
> Events in a group are guaranteed to be active on the PMU at the
> same time. That means a group cannot have more events than there
> are available counters on the PMU. Tools may want to know the
> number of counters av
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