From: Yabin Cui <yabinc@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>
Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org, Yabin Cui <yabinc@google.com>
Subject: [PATCH v3 3/3] perf: core: Check sample_type in perf_sample_save_brstack
Date: Thu, 9 May 2024 17:05:02 -0700 [thread overview]
Message-ID: <20240510000502.1257463-4-yabinc@google.com> (raw)
In-Reply-To: <20240510000502.1257463-1-yabinc@google.com>
Check sample_type in perf_sample_save_brstack() to prevent
saving branch stack data when it isn't required.
Suggested-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Yabin Cui <yabinc@google.com>
---
arch/x86/events/amd/core.c | 3 +--
arch/x86/events/core.c | 3 +--
arch/x86/events/intel/ds.c | 3 +--
include/linux/perf_event.h | 3 +++
4 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 985ef3b47919..fb9bf3aa1b42 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -967,8 +967,7 @@ static int amd_pmu_v2_handle_irq(struct pt_regs *regs)
if (!x86_perf_event_set_period(event))
continue;
- if (has_branch_stack(event))
- perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL);
+ perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL);
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 5b0dd07b1ef1..ff5577315938 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1702,8 +1702,7 @@ int x86_pmu_handle_irq(struct pt_regs *regs)
perf_sample_data_init(&data, 0, event->hw.last_period);
- if (has_branch_stack(event))
- perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL);
+ perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL);
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 c2b5585aa6d1..f25236ffa28f 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1754,8 +1754,7 @@ static void setup_pebs_fixed_sample_data(struct perf_event *event,
if (x86_pmu.intel_cap.pebs_format >= 3)
setup_pebs_time(event, data, pebs->tsc);
- if (has_branch_stack(event))
- perf_sample_save_brstack(data, event, &cpuc->lbr_stack, NULL);
+ perf_sample_save_brstack(data, event, &cpuc->lbr_stack, NULL);
}
static void adaptive_pebs_save_regs(struct pt_regs *regs,
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 8617815456b0..8cff96782446 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1276,6 +1276,9 @@ static inline void perf_sample_save_brstack(struct perf_sample_data *data,
{
int size = sizeof(u64); /* nr */
+ if (!has_branch_stack(event))
+ return;
+
if (branch_sample_hw_index(event))
size += sizeof(u64);
size += brs->nr * sizeof(struct perf_branch_entry);
--
2.45.0.118.g7fe29c98d7-goog
next prev parent reply other threads:[~2024-05-10 0:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-10 0:04 [PATCH v3 0/3] perf:core: Save raw sample data Yabin Cui
2024-05-10 0:05 ` [PATCH v3 1/3] perf/core: Save raw sample data conditionally based on sample type Yabin Cui
2024-05-10 0:05 ` [PATCH v3 2/3] perf: core: Check sample_type in perf_sample_save_callchain Yabin Cui
2024-05-10 0:05 ` Yabin Cui [this message]
-- strict thread matches above, loose matches on Subject: below --
2024-05-10 0:24 [PATCH v3 0/3] perf:core: Save raw sample data Yabin Cui
2024-05-10 0:24 ` [PATCH v3 3/3] perf: core: Check sample_type in perf_sample_save_brstack Yabin Cui
2024-05-10 10:54 ` kernel test robot
2024-05-10 11:15 ` kernel test robot
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