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perf: Use sample_flags for txn 

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220901130959.1285717-7-kan.liang@linux.intel.com
This commit is contained in:
Kan Liang 2022-09-01 06:09:59 -07:00 committed by Peter Zijlstra
parent e16fd7f2cb
commit ee9db0e14b
3 changed files with 10 additions and 4 deletions
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8
arch/x86/events/intel/ds.c
View File

@ -1628,9 +1628,11 @@ 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;
}
}
/*
@ -1780,9 +1782,11 @@ 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) {

3
include/linux/perf_event.h
View File

@ -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;
}
/*

3
kernel/events/core.c
View File

@ -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);