On 10/24/2012 04:23 PM, Yan, Zheng wrote:
> On 10/24/2012 04:15 PM, Stephane Eranian wrote:
>> On Wed, Oct 24, 2012 at 9:49 AM, Yan, Zheng <zheng.z....@intel.com> wrote:
>>> On 10/24/2012 03:28 PM, Stephane Eranian wrote:
>>>> On Wed, Oct 24, 2012 at 7:59 AM, Yan, Zheng <zheng.z....@intel.com> wrote:
>>>>> From: "Yan, Zheng" <zheng.z....@intel.com>
>>>>>
>>>>> The index of lbr_sel_map is bit value of perf branch_sample_type.
>>>>> By using bit shift as index, we can reduce lbr_sel_map size.
>>>>>
>>>>> Signed-off-by: Yan, Zheng <zheng.z....@intel.com>
>>>>> ---
>>>>> arch/x86/kernel/cpu/perf_event.h | 4 +++
>>>>> arch/x86/kernel/cpu/perf_event_intel_lbr.c | 50
>>>>> ++++++++++++++----------------
>>>>> include/uapi/linux/perf_event.h | 42 +++++++++++++++++--------
>>>>> 3 files changed, 56 insertions(+), 40 deletions(-)
>>>>>
>>>>> diff --git a/arch/x86/kernel/cpu/perf_event.h
>>>>> b/arch/x86/kernel/cpu/perf_event.h
>>>>> index d3b3bb7..ea6749a 100644
>>>>> --- a/arch/x86/kernel/cpu/perf_event.h
>>>>> +++ b/arch/x86/kernel/cpu/perf_event.h
>>>>> @@ -412,6 +412,10 @@ struct x86_pmu {
>>>>> struct perf_guest_switch_msr *(*guest_get_msrs)(int *nr);
>>>>> };
>>>>>
>>>>> +enum {
>>>>> + PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE = PERF_SAMPLE_BRANCH_MAX_SHIFT,
>>>>> +};
>>>>> +
>>>> What's the point on the extraneous definition?
>>>
>>> because later patches will add map PERF_SAMPLE_BRANCH_CALL_STACK, it will
>>> make
>>> "PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE != PERF_SAMPLE_BRANCH_MAX_SHIFT"
>>>
>> And you are not going to do:
>>
>> enum perf_branch_sample_type_shift {
>> ...
>> PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT = 10
>> PERF_SAMPLE_BRANCH_MAX_SHIFT
>> };
>>
>> PERF_SAMPLE_BRANCH_CALL_STACK = 1 << PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT
>>
>> Unless you're telling you are not going to add a mapping for
>> PERF_SAMPLE_CALL_STACK to the
>> lbr_sel_map[]?
>>
>
> I think include/uapi/linux/perf_event.h should only contain definition for
> user API.
> So I added PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT and
> PERF_SAMPLE_BRANCH_CALL_STACK to
> arch/x86/kernel/cpu/perf_event.h. Please check patch 1.
>
Sorry, I mean patch 2.
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