On 09/08/2017 15:18, Michael Ellerman wrote:
> Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx> writes:
>
>> Add new software events to count succeeded and failed speculative page
>> faults.
>>
>> Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
>> ---
>> include/uapi/linux/perf_event.h | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
>> index b1c0b187acfe..fbfb03dff334 100644
>> --- a/include/uapi/linux/perf_event.h
>> +++ b/include/uapi/linux/perf_event.h
>> @@ -111,6 +111,8 @@ enum perf_sw_ids {
>> PERF_COUNT_SW_EMULATION_FAULTS = 8,
>> PERF_COUNT_SW_DUMMY = 9,
>> PERF_COUNT_SW_BPF_OUTPUT = 10,
>> + PERF_COUNT_SW_SPF_DONE = 11,
>> + PERF_COUNT_SW_SPF_FAILED = 12,
>
> Can't you calculate:
>
> PERF_COUNT_SW_SPF_FAILED = PERF_COUNT_SW_PAGE_FAULTS - PERF_COUNT_SW_SPF_DONE
>
> ie. do you need a separate event for it?
Unfortunately not, because PERF_COUNT_SW_PAGE_FAULTS counts also page
faults from the kernel space, while SPF is only concerning user space page
faults.
Cheers,
Laurent.
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