lkml.org 
[lkml]   [2022]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 6/6] perf: Use sample_flags for txn
Date
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 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
\
 
 \ /
  Last update: 2022-08-31 16:57    [W:0.149 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site