From: kan.liang@linux.intel.com
To: peterz@infradead.org, acme@redhat.com, mingo@kernel.org,
linux-kernel@vger.kernel.org
Cc: jolsa@kernel.org, namhyung@kernel.org,
vitaly.slobodskoy@intel.com, pavel.gerasimov@intel.com,
ak@linux.intel.com, eranian@google.com, mpe@ellerman.id.au,
Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH V4 06/13] perf header: Support CPU PMU capabilities
Date: Tue, 19 Nov 2019 06:34:04 -0800 [thread overview]
Message-ID: <20191119143411.3482-7-kan.liang@linux.intel.com> (raw)
In-Reply-To: <20191119143411.3482-1-kan.liang@linux.intel.com>
From: Kan Liang <kan.liang@linux.intel.com>
To stitch LBR call stack, the max LBR information is required. So the
CPU PMU capabilities information has to be stored in perf header.
Add a new feature HEADER_CPU_PMU_CAPS for CPU PMU capabilities.
Retrieve all CPU PMU capabilities, not just max LBR information.
Add variable max_branches to facilitate future usage.
The CPU PMU capabilities information is only useful for LBR call stack
mode. Clear the feature for perf stat and other perf record mode.
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
.../Documentation/perf.data-file-format.txt | 16 +++
tools/perf/builtin-record.c | 3 +
tools/perf/builtin-stat.c | 1 +
tools/perf/util/env.h | 3 +
| 110 ++++++++++++++++++
| 1 +
6 files changed, 134 insertions(+)
diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index b0152e1095c5..b6472e463284 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -373,6 +373,22 @@ struct {
Indicates that trace contains records of PERF_RECORD_COMPRESSED type
that have perf_events records in compressed form.
+ HEADER_CPU_PMU_CAPS = 28,
+
+ A list of cpu PMU capabilities. The format of data is as below.
+
+struct {
+ u32 nr_cpu_pmu_caps;
+ {
+ char name[];
+ char value[];
+ } [nr_cpu_pmu_caps]
+};
+
+
+Example:
+ cpu pmu capabilities: branches=32, max_precise=3, pmu_name=icelake
+
other bits are reserved and should ignored for now
HEADER_FEAT_BITS = 256,
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index b95c000c1ed9..b53e19eb4b6c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1106,6 +1106,9 @@ static void record__init_features(struct record *rec)
if (!record__comp_enabled(rec))
perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
+ if (!callchain_param.enabled || (callchain_param.record_mode != CALLCHAIN_LBR))
+ perf_header__clear_feat(&session->header, HEADER_CPU_PMU_CAPS);
+
perf_header__clear_feat(&session->header, HEADER_STAT);
}
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 5964e808d73d..ed2d0aa7a861 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1471,6 +1471,7 @@ static void init_features(struct perf_session *session)
perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
+ perf_header__clear_feat(&session->header, HEADER_CPU_PMU_CAPS);
}
static int __cmd_record(int argc, const char **argv)
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 11d05ae3606a..d286d478b4d8 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -48,6 +48,7 @@ struct perf_env {
char *cpuid;
unsigned long long total_mem;
unsigned int msr_pmu_type;
+ unsigned int max_branches;
int nr_cmdline;
int nr_sibling_cores;
@@ -57,12 +58,14 @@ struct perf_env {
int nr_memory_nodes;
int nr_pmu_mappings;
int nr_groups;
+ int nr_cpu_pmu_caps;
char *cmdline;
const char **cmdline_argv;
char *sibling_cores;
char *sibling_dies;
char *sibling_threads;
char *pmu_mappings;
+ char *cpu_pmu_caps;
struct cpu_topology_map *cpu;
struct cpu_cache_level *caches;
int caches_cnt;
--git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7ed481c9bcdf..6d32e5f1192c 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1404,6 +1404,39 @@ static int write_compressed(struct feat_fd *ff __maybe_unused,
return do_write(ff, &(ff->ph->env.comp_mmap_len), sizeof(ff->ph->env.comp_mmap_len));
}
+static int write_cpu_pmu_caps(struct feat_fd *ff,
+ struct evlist *evlist __maybe_unused)
+{
+ struct perf_pmu_caps *caps = NULL;
+ struct perf_pmu *cpu_pmu;
+ int nr_caps;
+ int ret;
+
+ cpu_pmu = perf_pmu__find("cpu");
+ if (!cpu_pmu)
+ return -ENOENT;
+
+ nr_caps = perf_pmu__caps_parse(cpu_pmu);
+ if (nr_caps < 0)
+ return nr_caps;
+
+ ret = do_write(ff, &nr_caps, sizeof(nr_caps));
+ if (ret < 0)
+ return ret;
+
+ while ((caps = perf_pmu__scan_caps(cpu_pmu, caps))) {
+ ret = do_write_string(ff, caps->name);
+ if (ret < 0)
+ return ret;
+
+ ret = do_write_string(ff, caps->value);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+}
+
static void print_hostname(struct feat_fd *ff, FILE *fp)
{
fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
@@ -1819,6 +1852,28 @@ static void print_compressed(struct feat_fd *ff, FILE *fp)
ff->ph->env.comp_level, ff->ph->env.comp_ratio);
}
+static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)
+{
+ const char *delimiter = "# cpu pmu capabilities: ";
+ char *str;
+ u32 nr_caps;
+
+ nr_caps = ff->ph->env.nr_cpu_pmu_caps;
+ if (!nr_caps) {
+ fprintf(fp, "# cpu pmu capabilities: not available\n");
+ return;
+ }
+
+ str = ff->ph->env.cpu_pmu_caps;
+ while (nr_caps--) {
+ fprintf(fp, "%s%s", delimiter, str);
+ delimiter = ", ";
+ str += strlen(str) + 1;
+ }
+
+ fprintf(fp, "\n");
+}
+
static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
{
const char *delimiter = "# pmu mappings: ";
@@ -2856,6 +2911,60 @@ static int process_compressed(struct feat_fd *ff,
return 0;
}
+static int process_cpu_pmu_caps(struct feat_fd *ff,
+ void *data __maybe_unused)
+{
+ char *name, *value;
+ struct strbuf sb;
+ u32 nr_caps;
+
+ if (do_read_u32(ff, &nr_caps))
+ return -1;
+
+ if (!nr_caps) {
+ pr_debug("cpu pmu capabilities not available\n");
+ return 0;
+ }
+
+ ff->ph->env.nr_cpu_pmu_caps = nr_caps;
+
+ if (strbuf_init(&sb, 128) < 0)
+ return -1;
+
+ while (nr_caps--) {
+ name = do_read_string(ff);
+ if (!name)
+ goto error;
+
+ value = do_read_string(ff);
+ if (!value)
+ goto free_name;
+
+ if (strbuf_addf(&sb, "%s=%s", name, value) < 0)
+ goto free_value;
+
+ /* include a NULL character at the end */
+ if (strbuf_add(&sb, "", 1) < 0)
+ goto free_value;
+
+ if (!strcmp(name, "branches"))
+ ff->ph->env.max_branches = atoi(value);
+
+ free(value);
+ free(name);
+ }
+ ff->ph->env.cpu_pmu_caps = strbuf_detach(&sb, NULL);
+ return 0;
+
+free_value:
+ free(value);
+free_name:
+ free(name);
+error:
+ strbuf_release(&sb);
+ return -1;
+}
+
#define FEAT_OPR(n, func, __full_only) \
[HEADER_##n] = { \
.name = __stringify(n), \
@@ -2913,6 +3022,7 @@ const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPR(BPF_PROG_INFO, bpf_prog_info, false),
FEAT_OPR(BPF_BTF, bpf_btf, false),
FEAT_OPR(COMPRESSED, compressed, false),
+ FEAT_OPR(CPU_PMU_CAPS, cpu_pmu_caps, false),
};
struct header_print_data {
--git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 840f95cee349..650bd1c7a99b 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -43,6 +43,7 @@ enum {
HEADER_BPF_PROG_INFO,
HEADER_BPF_BTF,
HEADER_COMPRESSED,
+ HEADER_CPU_PMU_CAPS,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
--
2.17.1
next prev parent reply other threads:[~2019-11-19 14:35 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-19 14:33 [PATCH V4 00/13] Stitch LBR call stack kan.liang
2019-11-19 14:33 ` [PATCH V4 01/13] perf/core: Add new branch sample type for LBR TOS kan.liang
2019-11-19 19:02 ` Stephane Eranian
2019-11-19 22:25 ` Liang, Kan
2019-11-19 22:51 ` Stephane Eranian
2019-11-20 15:06 ` Liang, Kan
2019-11-19 14:34 ` [PATCH V4 02/13] perf/x86/intel: Output LBR TOS information kan.liang
2019-11-19 14:34 ` [PATCH V4 03/13] perf tools: Support new branch sample type for LBR TOS kan.liang
2019-11-19 19:00 ` Stephane Eranian
2019-11-19 21:31 ` Peter Zijlstra
2019-11-19 22:17 ` Liang, Kan
2019-11-19 14:34 ` [PATCH V4 04/13] perf header: Add check for event attr kan.liang
2019-11-19 14:34 ` [PATCH V4 05/13] perf pmu: Add support for PMU capabilities kan.liang
2019-11-19 14:34 ` kan.liang [this message]
2019-11-19 14:34 ` [PATCH V4 07/13] perf machine: Refine the function for LBR call stack reconstruction kan.liang
2019-11-19 14:34 ` [PATCH V4 08/13] perf tools: Stitch LBR call stack kan.liang
2019-11-19 14:34 ` [PATCH V4 09/13] perf report: Add option to enable the LBR stitching approach kan.liang
2019-11-19 14:34 ` [PATCH V4 10/13] perf script: " kan.liang
2019-11-19 14:34 ` [PATCH V4 11/13] perf top: " kan.liang
2019-11-19 14:34 ` [PATCH V4 12/13] perf c2c: " kan.liang
2019-11-19 14:34 ` [RFC PATCH V4 13/13] perf hist: Add fast path for duplicate entries check approach kan.liang
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