[PATCH V2 6/6] perf: Use sample_flags for txn

From: kan.liang@linux.intel.com
To: peterz@infradead.org, acme@kernel.org, mingo@redhat.com,
	eranian@google.com, mpe@ellerman.id.au,
	linux-kernel@vger.kernel.org
Cc: ak@linux.intel.com, andreas.kogler.0x@gmail.com,
	atrajeev@linux.vnet.ibm.com, namhyung@kernel.org,
	ravi.bangoria@amd.com, Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH V2 6/6] perf: Use sample_flags for txn
Date: Thu,  1 Sep 2022 06:09:59 -0700	[thread overview]
Message-ID: <20220901130959.1285717-7-kan.liang@linux.intel.com> (raw)
In-Reply-To: <20220901130959.1285717-1-kan.liang@linux.intel.com>

From: Kan Liang <kan.liang@linux.intel.com>

Use the new sample_flags to indicate whether the txn field is filled by
the PMU driver.

Remove the txn field from the perf_sample_data_init() to minimize the
number of cache lines touched.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
 arch/x86/events/intel/ds.c | 8 ++++++--
 include/linux/perf_event.h | 3 +--
 kernel/events/core.c       | 3 +++
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 985bbbab057f..cbcb5c2e832c 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1636,9 +1636,11 @@ static void setup_pebs_fixed_sample_data(struct perf_event *event,
 			data->weight.full = intel_get_tsx_weight(pebs->tsx_tuning);
 			data->sample_flags |= PERF_SAMPLE_WEIGHT_TYPE;
 		}
-		if (sample_type & PERF_SAMPLE_TRANSACTION)
+		if (sample_type & PERF_SAMPLE_TRANSACTION) {
 			data->txn = intel_get_tsx_transaction(pebs->tsx_tuning,
 							      pebs->ax);
+			data->sample_flags |= PERF_SAMPLE_TRANSACTION;
+		}
 	}
 
 	/*
@@ -1788,9 +1790,11 @@ static void setup_pebs_adaptive_sample_data(struct perf_event *event,
 		if (sample_type & PERF_SAMPLE_ADDR_TYPE)
 			data->addr = meminfo->address;
 
-		if (sample_type & PERF_SAMPLE_TRANSACTION)
+		if (sample_type & PERF_SAMPLE_TRANSACTION) {
 			data->txn = intel_get_tsx_transaction(meminfo->tsx_tuning,
 							  gprs ? gprs->ax : 0);
+			data->sample_flags |= PERF_SAMPLE_TRANSACTION;
+		}
 	}
 
 	if (format_size & PEBS_DATACFG_XMMS) {
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6849f10dfc7e..581880ddb9ef 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1012,7 +1012,6 @@ struct perf_sample_data {
 	u64				addr;
 	struct perf_raw_record		*raw;
 	u64				period;
-	u64				txn;
 
 	/*
 	 * The other fields, optionally {set,used} by
@@ -1021,6 +1020,7 @@ struct perf_sample_data {
 	struct perf_branch_stack	*br_stack;
 	union perf_sample_weight	weight;
 	union  perf_mem_data_src	data_src;
+	u64				txn;
 
 	u64				type;
 	u64				ip;
@@ -1063,7 +1063,6 @@ static inline void perf_sample_data_init(struct perf_sample_data *data,
 	data->addr = addr;
 	data->raw  = NULL;
 	data->period = period;
-	data->txn = 0;
 }
 
 /*
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 163e2f478e61..15d27b14c827 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7414,6 +7414,9 @@ void perf_prepare_sample(struct perf_event_header *header,
 	if (filtered_sample_type & PERF_SAMPLE_DATA_SRC)
 		data->data_src.val = PERF_MEM_NA;
 
+	if (filtered_sample_type & PERF_SAMPLE_TRANSACTION)
+		data->txn = 0;
+
 	if (sample_type & PERF_SAMPLE_REGS_INTR) {
 		/* regs dump ABI info */
 		int size = sizeof(u64);
-- 
2.35.1

