Messages in this thread | | | Subject | Re: [PATCH 13/16] perf: Add a speculative page fault sw events | From | Laurent Dufour <> | Date | Wed, 9 Aug 2017 15:25:48 +0200 |
| |
On 09/08/2017 15:18, Michael Ellerman wrote: > Laurent Dufour <ldufour@linux.vnet.ibm.com> writes: > >> Add new software events to count succeeded and failed speculative page >> faults. >> >> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> >> --- >> 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.
| |