[tip:perf/core] perf/x86/intel: Expose LBR callstack to user space tooling
From: tip-bot for Peter Zijlstra
Date: Wed Feb 18 2015 - 12:18:55 EST
Commit-ID: 2c44b1936bb3b135a3fac8b3493394d42e51cf70
Gitweb: http://git.kernel.org/tip/2c44b1936bb3b135a3fac8b3493394d42e51cf70
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 5 Nov 2014 10:36:45 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 18 Feb 2015 17:16:15 +0100
perf/x86/intel: Expose LBR callstack to user space tooling
With LBR call stack feature enable, there are three callchain options.
Enable the 3rd callchain option (LBR callstack) to user space tooling.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Cc: linux-api@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20141105093759.GQ10501@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event.h | 8 --------
arch/x86/kernel/cpu/perf_event_intel_lbr.c | 8 ++++----
include/uapi/linux/perf_event.h | 16 ++++++++--------
3 files changed, 12 insertions(+), 20 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index 69c26b3..a371d27 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -523,14 +523,6 @@ struct x86_perf_task_context {
int lbr_stack_state;
};
-enum {
- PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT = PERF_SAMPLE_BRANCH_MAX_SHIFT,
- PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE,
-
- PERF_SAMPLE_BRANCH_CALL_STACK =
- 1U << PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT,
-};
-
#define x86_add_quirk(func_) \
do { \
static struct x86_pmu_quirk __quirk __initdata = { \
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 084f2eb..0473874 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -537,7 +537,7 @@ static int intel_pmu_setup_hw_lbr_filter(struct perf_event *event)
u64 mask = 0, v;
int i;
- for (i = 0; i < PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE; i++) {
+ for (i = 0; i < PERF_SAMPLE_BRANCH_MAX_SHIFT; i++) {
if (!(br_type & (1ULL << i)))
continue;
@@ -821,7 +821,7 @@ intel_pmu_lbr_filter(struct cpu_hw_events *cpuc)
/*
* Map interface branch filters onto LBR filters
*/
-static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
+static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX_SHIFT] = {
[PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY,
[PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER,
[PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL,
@@ -840,7 +840,7 @@ static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
[PERF_SAMPLE_BRANCH_COND_SHIFT] = LBR_JCC,
};
-static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
+static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX_SHIFT] = {
[PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY,
[PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER,
[PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL,
@@ -852,7 +852,7 @@ static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
[PERF_SAMPLE_BRANCH_COND_SHIFT] = LBR_JCC,
};
-static const int hsw_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
+static const int hsw_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX_SHIFT] = {
[PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY,
[PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER,
[PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL,
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index e46b932..1e3cd07 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -166,6 +166,8 @@ enum perf_branch_sample_type_shift {
PERF_SAMPLE_BRANCH_NO_TX_SHIFT = 9, /* not in transaction */
PERF_SAMPLE_BRANCH_COND_SHIFT = 10, /* conditional branches */
+ PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT = 11, /* call/ret stack */
+
PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */
};
@@ -175,18 +177,16 @@ enum perf_branch_sample_type {
PERF_SAMPLE_BRANCH_HV = 1U << PERF_SAMPLE_BRANCH_HV_SHIFT,
PERF_SAMPLE_BRANCH_ANY = 1U << PERF_SAMPLE_BRANCH_ANY_SHIFT,
- PERF_SAMPLE_BRANCH_ANY_CALL =
- 1U << PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT,
- PERF_SAMPLE_BRANCH_ANY_RETURN =
- 1U << PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT,
- PERF_SAMPLE_BRANCH_IND_CALL =
- 1U << PERF_SAMPLE_BRANCH_IND_CALL_SHIFT,
- PERF_SAMPLE_BRANCH_ABORT_TX =
- 1U << PERF_SAMPLE_BRANCH_ABORT_TX_SHIFT,
+ PERF_SAMPLE_BRANCH_ANY_CALL = 1U << PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT,
+ PERF_SAMPLE_BRANCH_ANY_RETURN = 1U << PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT,
+ PERF_SAMPLE_BRANCH_IND_CALL = 1U << PERF_SAMPLE_BRANCH_IND_CALL_SHIFT,
+ PERF_SAMPLE_BRANCH_ABORT_TX = 1U << PERF_SAMPLE_BRANCH_ABORT_TX_SHIFT,
PERF_SAMPLE_BRANCH_IN_TX = 1U << PERF_SAMPLE_BRANCH_IN_TX_SHIFT,
PERF_SAMPLE_BRANCH_NO_TX = 1U << PERF_SAMPLE_BRANCH_NO_TX_SHIFT,
PERF_SAMPLE_BRANCH_COND = 1U << PERF_SAMPLE_BRANCH_COND_SHIFT,
+ PERF_SAMPLE_BRANCH_CALL_STACK = 1U << PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT,
+
PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT,
};
--
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