linux-kernel - [PATCH 6/6] perf: Use sample

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Date:   Wed, 31 Aug 2022 07:55:14 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, acme@...nel.org, mingo@...hat.com,
        eranian@...gle.com, mpe@...erman.id.au,
        linux-kernel@...r.kernel.org
Cc:     ak@...ux.intel.com, andreas.kogler.0x@...il.com,
        atrajeev@...ux.vnet.ibm.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 6/6] perf: Use sample_flags for txn

From: Kan Liang <kan.liang@...ux.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@...ux.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 9a10457ff32a..3c6a68d7fe42 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1633,9 +1633,11 @@ 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;
+		}
 	}
 
 	/*
@@ -1785,9 +1787,11 @@ 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 79b44084c15d..d7c9fdd82bc3 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1011,7 +1011,6 @@ struct perf_sample_data {
 	u64				addr;
 	struct perf_raw_record		*raw;
 	u64				period;
-	u64				txn;
 
 	/*
 	 * The other fields, optionally {set,used} by
@@ -1020,6 +1019,7 @@ 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;
@@ -1062,7 +1062,6 @@ 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