The following commit has been merged into the perf/core branch of tip:
Commit-ID: a9a931e2666878343782c82d7d55cc173ddeb3e9
Gitweb: https://git.kernel.org/tip/a9a931e2666878343782c82d7d55cc173ddeb3e9
Author: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 01 Sep 2022 06:09:56 -07:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 06 Sep 2022 11:33:02 +02:00
perf: Use sample_flags for branch stack
Use the new sample_flags to indicate whether the branch stack is filled
by the PMU driver.
Remove the br_stack from the perf_sample_data_init() to minimize the number
of cache lines touched.
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220901130959.1285717-4-kan.liang@xxxxxxxxxxxxxxx
---
arch/powerpc/perf/core-book3s.c | 1 +
arch/x86/events/amd/core.c | 4 +++-
arch/x86/events/core.c | 4 +++-
arch/x86/events/intel/core.c | 4 +++-
arch/x86/events/intel/ds.c | 5 ++++-
include/linux/perf_event.h | 4 ++--
kernel/events/core.c | 4 ++--
7 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 13919eb..1ad1efd 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -2297,6 +2297,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val,
cpuhw = this_cpu_ptr(&cpu_hw_events);
power_pmu_bhrb_read(event, cpuhw);
data.br_stack = &cpuhw->bhrb_stack;
+ data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
}
if (event->attr.sample_type & PERF_SAMPLE_DATA_SRC &&
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 36bede1..bd99d2a 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -929,8 +929,10 @@ static int amd_pmu_v2_handle_irq(struct pt_regs *regs)
if (!x86_perf_event_set_period(event))
continue;
- if (has_branch_stack(event))
+ if (has_branch_stack(event)) {
data.br_stack = &cpuc->lbr_stack;
+ data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+ }
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index f969410..bb34a28 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1714,8 +1714,10 @@ int x86_pmu_handle_irq(struct pt_regs *regs)
perf_sample_data_init(&data, 0, event->hw.last_period);
- if (has_branch_stack(event))
+ if (has_branch_stack(event)) {
data.br_stack = &cpuc->lbr_stack;
+ data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+ }
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 2db9349..ba101c2 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2995,8 +2995,10 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
perf_sample_data_init(&data, 0, event->hw.last_period);
- if (has_branch_stack(event))
+ if (has_branch_stack(event)) {
data.br_stack = &cpuc->lbr_stack;
+ data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+ }
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index cdd857b..0489f75 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1640,8 +1640,10 @@ static void setup_pebs_fixed_sample_data(struct perf_event *event,
data->sample_flags |= PERF_SAMPLE_TIME;
}
- if (has_branch_stack(event))
+ if (has_branch_stack(event)) {
data->br_stack = &cpuc->lbr_stack;
+ data->sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+ }
}
static void adaptive_pebs_save_regs(struct pt_regs *regs,
@@ -1791,6 +1793,7 @@ static void setup_pebs_adaptive_sample_data(struct perf_event *event,
if (has_branch_stack(event)) {
intel_pmu_store_pebs_lbrs(lbr);
data->br_stack = &cpuc->lbr_stack;
+ data->sample_flags |= PERF_SAMPLE_BRANCH_STACK;
}
}
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 0978165..1e12e79 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1011,7 +1011,6 @@ struct perf_sample_data {
u64 sample_flags;
u64 addr;
struct perf_raw_record *raw;
- struct perf_branch_stack *br_stack;
u64 period;
union perf_sample_weight weight;
u64 txn;
@@ -1021,6 +1020,8 @@ struct perf_sample_data {
* The other fields, optionally {set,used} by
* perf_{prepare,output}_sample().
*/
+ struct perf_branch_stack *br_stack;
+
u64 type;
u64 ip;
struct {
@@ -1061,7 +1062,6 @@ static inline void perf_sample_data_init(struct perf_sample_data *data,
data->sample_flags = 0;
data->addr = addr;
data->raw = NULL;
- data->br_stack = NULL;
data->period = period;
data->weight.full = 0;
data->data_src.val = PERF_MEM_NA;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index c9b9cb7..104c0c9 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7052,7 +7052,7 @@ void perf_output_sample(struct perf_output_handle *handle,
}
if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
- if (data->br_stack) {
+ if (data->sample_flags & PERF_SAMPLE_BRANCH_STACK) {
size_t size;
size = data->br_stack->nr
@@ -7358,7 +7358,7 @@ void perf_prepare_sample(struct perf_event_header *header,
if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
int size = sizeof(u64); /* nr */
- if (data->br_stack) {
+ if (data->sample_flags & PERF_SAMPLE_BRANCH_STACK) {
if (perf_sample_save_hw_index(event))
size += sizeof(u64);
|