[PATCH V2 8/9] perf report: Support Retire Latency

From: kan . liang
Date: Wed Jan 04 2023 - 15:14:47 EST


From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

The Retire Latency field is added in the var3_w of the
PERF_SAMPLE_WEIGHT_STRUCT. The Retire Latency reports pipeline stall
of this instruction compared to the previous instruction in cycles.
That's quite useful to display the information with perf mem report.

The p_stage_cyc for Power is also from the var3_w. Union the p_stage_cyc
and retire_lat to share the code.

Implement X86 specific codes to display the X86 specific header.

Add a new sort key retire_lat for the Retire Latency.

Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---

Change since V1
- Rebase on top of 6.2-rc1

tools/perf/Documentation/perf-report.txt | 2 ++
tools/perf/arch/x86/util/event.c | 20 ++++++++++++++++++++
tools/perf/util/sample.h | 5 ++++-
tools/perf/util/sort.c | 2 ++
tools/perf/util/sort.h | 2 ++
5 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 4fa509b15948..e3971ddb666c 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -115,6 +115,8 @@ OPTIONS
- p_stage_cyc: On powerpc, this presents the number of cycles spent in a
pipeline stage. And currently supported only on powerpc.
- addr: (Full) virtual address of the sampled instruction
+ - retire_lat: On X86, this reports pipeline stall of this instruction compared
+ to the previous instruction in cycles. And currently supported only on X86

By default, comm, dso and symbol keys are used.
(i.e. --sort comm,dso,symbol)
diff --git a/tools/perf/arch/x86/util/event.c b/tools/perf/arch/x86/util/event.c
index a3acefe6d0c6..37b3feb53e8d 100644
--- a/tools/perf/arch/x86/util/event.c
+++ b/tools/perf/arch/x86/util/event.c
@@ -89,6 +89,7 @@ void arch_perf_parse_sample_weight(struct perf_sample *data,
else {
data->weight = weight.var1_dw;
data->ins_lat = weight.var2_w;
+ data->retire_lat = weight.var3_w;
}
}

@@ -102,3 +103,22 @@ void arch_perf_synthesize_sample_weight(const struct perf_sample *data,
*array |= ((u64)data->ins_lat << 32);
}
}
+
+const char *arch_perf_header_entry(const char *se_header)
+{
+ if (!strcmp(se_header, "Local Pipeline Stage Cycle"))
+ return "Local Retire Latency";
+ else if (!strcmp(se_header, "Pipeline Stage Cycle"))
+ return "Retire Latency";
+
+ return se_header;
+}
+
+int arch_support_sort_key(const char *sort_key)
+{
+ if (!strcmp(sort_key, "p_stage_cyc"))
+ return 1;
+ if (!strcmp(sort_key, "local_p_stage_cyc"))
+ return 1;
+ return 0;
+}
diff --git a/tools/perf/util/sample.h b/tools/perf/util/sample.h
index 60ec79d4eea4..33b08e0ac746 100644
--- a/tools/perf/util/sample.h
+++ b/tools/perf/util/sample.h
@@ -92,7 +92,10 @@ struct perf_sample {
u8 cpumode;
u16 misc;
u16 ins_lat;
- u16 p_stage_cyc;
+ union {
+ u16 p_stage_cyc;
+ u16 retire_lat;
+ };
bool no_hw_idx; /* No hw_idx collected in branch_stack */
char insn[MAX_INSN];
void *raw_data;
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index e188f74698dd..e2cc18cd08cd 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2132,6 +2132,8 @@ static struct sort_dimension common_sort_dimensions[] = {
DIM(SORT_LOCAL_PIPELINE_STAGE_CYC, "local_p_stage_cyc", sort_local_p_stage_cyc),
DIM(SORT_GLOBAL_PIPELINE_STAGE_CYC, "p_stage_cyc", sort_global_p_stage_cyc),
DIM(SORT_ADDR, "addr", sort_addr),
+ DIM(SORT_LOCAL_RETIRE_LAT, "local_retire_lat", sort_local_p_stage_cyc),
+ DIM(SORT_GLOBAL_RETIRE_LAT, "retire_lat", sort_global_p_stage_cyc),
};

#undef DIM
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 921715e6aec4..9a91d0df2833 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -237,6 +237,8 @@ enum sort_type {
SORT_LOCAL_PIPELINE_STAGE_CYC,
SORT_GLOBAL_PIPELINE_STAGE_CYC,
SORT_ADDR,
+ SORT_LOCAL_RETIRE_LAT,
+ SORT_GLOBAL_RETIRE_LAT,

/* branch stack specific sort keys */
__SORT_BRANCH_STACK,
--
2.35.1