Messages in this thread Patch in this message | | | From | kan.liang@linux ... | Subject | [PATCH V2 3/6] perf: Support branch events | Date | Mon, 22 May 2023 04:30:37 -0700 |
| |
From: Kan Liang <kan.liang@linux.intel.com>
With the cycle time information between branches, stalls can be easily observed. But it's difficult to explain what causes the long delay.
Add a new branch sample type to indicate whether include occurrences of events in branch info. The information will be stored in the branch stack extension space.
Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Kan Liang <kan.liang@linux.intel.com> ---
Changes since V1: - Rename to PERF_SAMPLE_BRANCH_EVT_CNTRS - Drop the event ID sample type
include/linux/perf_event.h | 4 ++++ include/uapi/linux/perf_event.h | 4 ++++ 2 files changed, 8 insertions(+)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index e2e04dc39199..823c6779a96d 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1137,6 +1137,10 @@ static inline bool branch_sample_priv(const struct perf_event *event) return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_PRIV_SAVE; } +static inline bool branch_sample_evt_cntrs(const struct perf_event *event) +{ + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_EVT_CNTRS; +} struct perf_sample_data { /* diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 1b3b90965b6b..3911cf000e8a 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -204,6 +204,8 @@ enum perf_branch_sample_type_shift { PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT = 18, /* save privilege mode */ + PERF_SAMPLE_BRANCH_EVT_CNTRS_SHIFT = 19, /* save occurrences of events on a branch */ + PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */ }; @@ -235,6 +237,8 @@ enum perf_branch_sample_type { PERF_SAMPLE_BRANCH_PRIV_SAVE = 1U << PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT, + PERF_SAMPLE_BRANCH_EVT_CNTRS = 1U << PERF_SAMPLE_BRANCH_EVT_CNTRS_SHIFT, + PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT, }; -- 2.35.1
| |