On 09/08/2017 15:18, Michael Ellerman wrote:

Laurent Dufour [off-list ref] writes:

quoted

Add new software events to count succeeded and failed speculative page
faults.

Signed-off-by: Laurent Dufour <redacted>
---
 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.