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Subject[PATCH 33/49] perf header: Support hybrid CPU_PMU_CAPS
Date
From: Jin Yao <yao.jin@linux.intel.com>

On hybrid platform, it may have several cpu pmus, such as,
"cpu_core" and "cpu_atom". The CPU_PMU_CAPS feature in perf
header needs to be improved to support multiple cpu pmus.

The new layout in header is:

<nr_caps>
<caps string>
<caps string>
<pmu name>
<nr of rest pmus>

It's also considered to be compatible with old perf.data.

With this patch,

On hybrid platform with new perf.data

root@otcpl-adl-s-2:~# ./perf report --header-only -I
...
# cpu_core pmu capabilities: branches=32, max_precise=3, pmu_name=alderlake_hybrid
# cpu_atom pmu capabilities: branches=32, max_precise=3, pmu_name=alderlake_hybrid

On hybrid platform with old perf.data

root@otcpl-adl-s-2:~# ./perf report --header-only -I
...
# cpu pmu capabilities: branches=32, max_precise=3, pmu_name=alderlake_hybrid

On non-hybrid platform with old perf.data

root@kbl-ppc:~# ./perf report --header-only -I
...
# cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake

On non-hybrid platform with new perf.data

root@kbl-ppc:~# ./perf report --header-only -I
...
# cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake

It's also tested for old perf with new per.data.

root@kbl-ppc:~# perf report --header-only -I
...
# cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake

Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/env.c | 6 ++
tools/perf/util/env.h | 11 ++-
tools/perf/util/header.c | 175 +++++++++++++++++++++++++++++++++++++++++------
3 files changed, 168 insertions(+), 24 deletions(-)

diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 9e05eca..8ef24aa 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -208,6 +208,12 @@ void perf_env__exit(struct perf_env *env)
zfree(&env->hybrid_nodes[i].pmu_name);
}
zfree(&env->hybrid_nodes);
+
+ for (i = 0; i < env->nr_cpu_pmu_caps_nodes; i++) {
+ zfree(&env->cpu_pmu_caps_nodes[i].cpu_pmu_caps);
+ zfree(&env->cpu_pmu_caps_nodes[i].pmu_name);
+ }
+ zfree(&env->cpu_pmu_caps_nodes);
}

void perf_env__init(struct perf_env *env __maybe_unused)
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 9ca7633..5552c98 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -42,6 +42,13 @@ struct hybrid_node {
struct perf_cpu_map *map;
};

+struct cpu_pmu_caps_node {
+ int nr_cpu_pmu_caps;
+ unsigned int max_branches;
+ char *cpu_pmu_caps;
+ char *pmu_name;
+};
+
struct perf_env {
char *hostname;
char *os_release;
@@ -63,15 +70,14 @@ struct perf_env {
int nr_memory_nodes;
int nr_pmu_mappings;
int nr_groups;
- int nr_cpu_pmu_caps;
int nr_hybrid_nodes;
+ int nr_cpu_pmu_caps_nodes;
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;
@@ -84,6 +90,7 @@ struct perf_env {
struct memory_node *memory_nodes;
unsigned long long memory_bsize;
struct hybrid_node *hybrid_nodes;
+ struct cpu_pmu_caps_node *cpu_pmu_caps_nodes;
#ifdef HAVE_LIBBPF_SUPPORT
/*
* bpf_info_lock protects bpf rbtrees. This is needed because the
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 6bcd959..b161ce3 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1459,18 +1459,22 @@ 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)
+static int write_per_cpu_pmu_caps(struct feat_fd *ff, struct perf_pmu *pmu,
+ int nr)
{
- struct perf_pmu *cpu_pmu = perf_pmu__find("cpu");
struct perf_pmu_caps *caps = NULL;
int nr_caps;
int ret;

- if (!cpu_pmu)
- return -ENOENT;
-
- nr_caps = perf_pmu__caps_parse(cpu_pmu);
+ /*
+ * The layout is:
+ * <nr_caps>
+ * <caps string>
+ * <caps string>
+ * <pmu name>
+ * <nr of rest pmus>
+ */
+ nr_caps = perf_pmu__caps_parse(pmu);
if (nr_caps < 0)
return nr_caps;

@@ -1478,7 +1482,7 @@ static int write_cpu_pmu_caps(struct feat_fd *ff,
if (ret < 0)
return ret;

- list_for_each_entry(caps, &cpu_pmu->caps, list) {
+ list_for_each_entry(caps, &pmu->caps, list) {
ret = do_write_string(ff, caps->name);
if (ret < 0)
return ret;
@@ -1488,9 +1492,50 @@ static int write_cpu_pmu_caps(struct feat_fd *ff,
return ret;
}

+ ret = do_write_string(ff, pmu->name);
+ if (ret < 0)
+ return ret;
+
+ ret = do_write(ff, &nr, sizeof(nr));
+ if (ret < 0)
+ return ret;
+
return ret;
}

+static int write_cpu_pmu_caps(struct feat_fd *ff,
+ struct evlist *evlist __maybe_unused)
+{
+ struct perf_pmu *pmu = perf_pmu__find("cpu");
+ u32 nr = 0;
+ int ret;
+
+ if (pmu)
+ nr = 1;
+ else {
+ perf_pmu__for_each_hybrid_pmus(pmu)
+ nr++;
+ pmu = NULL;
+ }
+
+ if (nr == 0)
+ return -1;
+
+ if (pmu) {
+ ret = write_per_cpu_pmu_caps(ff, pmu, 0);
+ if (ret < 0)
+ return ret;
+ } else {
+ perf_pmu__for_each_hybrid_pmus(pmu) {
+ ret = write_per_cpu_pmu_caps(ff, pmu, --nr);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
static void print_hostname(struct feat_fd *ff, FILE *fp)
{
fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
@@ -1963,18 +2008,28 @@ 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)
+static void print_per_cpu_pmu_caps(FILE *fp, struct cpu_pmu_caps_node *n)
{
- const char *delimiter = "# cpu pmu capabilities: ";
- u32 nr_caps = ff->ph->env.nr_cpu_pmu_caps;
- char *str;
+ const char *delimiter;
+ u32 nr_caps = n->nr_cpu_pmu_caps;
+ char *str, buf[128];

if (!nr_caps) {
- fprintf(fp, "# cpu pmu capabilities: not available\n");
+ if (!n->pmu_name)
+ fprintf(fp, "# cpu pmu capabilities: not available\n");
+ else
+ fprintf(fp, "# %s pmu capabilities: not available\n", n->pmu_name);
return;
}

- str = ff->ph->env.cpu_pmu_caps;
+ if (!n->pmu_name)
+ scnprintf(buf, sizeof(buf), "# cpu pmu capabilities: ");
+ else
+ scnprintf(buf, sizeof(buf), "# %s pmu capabilities: ", n->pmu_name);
+
+ delimiter = buf;
+
+ str = n->cpu_pmu_caps;
while (nr_caps--) {
fprintf(fp, "%s%s", delimiter, str);
delimiter = ", ";
@@ -1984,6 +2039,17 @@ static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)
fprintf(fp, "\n");
}

+static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)
+{
+ struct cpu_pmu_caps_node *n;
+ int i;
+
+ for (i = 0; i < ff->ph->env.nr_cpu_pmu_caps_nodes; i++) {
+ n = &ff->ph->env.cpu_pmu_caps_nodes[i];
+ print_per_cpu_pmu_caps(fp, n);
+ }
+}
+
static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
{
const char *delimiter = "# pmu mappings: ";
@@ -3093,13 +3159,14 @@ static int process_compressed(struct feat_fd *ff,
return 0;
}

-static int process_cpu_pmu_caps(struct feat_fd *ff,
- void *data __maybe_unused)
+static int process_cpu_pmu_caps_node(struct feat_fd *ff,
+ struct cpu_pmu_caps_node *n, bool *end)
{
- char *name, *value;
+ char *name, *value, *pmu_name;
struct strbuf sb;
- u32 nr_caps;
+ u32 nr_caps, nr;

+ *end = false;
if (do_read_u32(ff, &nr_caps))
return -1;

@@ -3108,7 +3175,7 @@ static int process_cpu_pmu_caps(struct feat_fd *ff,
return 0;
}

- ff->ph->env.nr_cpu_pmu_caps = nr_caps;
+ n->nr_cpu_pmu_caps = nr_caps;

if (strbuf_init(&sb, 128) < 0)
return -1;
@@ -3129,13 +3196,33 @@ static int process_cpu_pmu_caps(struct feat_fd *ff,
if (strbuf_add(&sb, "", 1) < 0)
goto free_value;

- if (!strcmp(name, "branches"))
- ff->ph->env.max_branches = atoi(value);
+ if (!strcmp(name, "branches")) {
+ n->max_branches = atoi(value);
+ if (n->max_branches > ff->ph->env.max_branches)
+ ff->ph->env.max_branches = n->max_branches;
+ }

free(value);
free(name);
}
- ff->ph->env.cpu_pmu_caps = strbuf_detach(&sb, NULL);
+
+ /*
+ * Old perf.data may not have pmu_name,
+ */
+ pmu_name = do_read_string(ff);
+ if (!pmu_name || strncmp(pmu_name, "cpu_", 4)) {
+ *end = true;
+ goto out;
+ }
+
+ if (do_read_u32(ff, &nr))
+ return -1;
+
+ if (nr == 0)
+ *end = true;
+out:
+ n->cpu_pmu_caps = strbuf_detach(&sb, NULL);
+ n->pmu_name = pmu_name;
return 0;

free_value:
@@ -3147,6 +3234,50 @@ static int process_cpu_pmu_caps(struct feat_fd *ff,
return -1;
}

+static int process_cpu_pmu_caps(struct feat_fd *ff,
+ void *data __maybe_unused)
+{
+ struct cpu_pmu_caps_node *nodes = NULL, *tmp;
+ int ret, i, nr_alloc = 1, nr_used = 0;
+ bool end;
+
+ while (1) {
+ if (nr_used == nr_alloc || !nodes) {
+ nr_alloc *= 2;
+ tmp = realloc(nodes, sizeof(*nodes) * nr_alloc);
+ if (!tmp)
+ return -ENOMEM;
+ memset(tmp + nr_used, 0,
+ sizeof(*nodes) * (nr_alloc - nr_used));
+ nodes = tmp;
+ }
+
+ ret = process_cpu_pmu_caps_node(ff, &nodes[nr_used], &end);
+ if (ret) {
+ if (nr_used)
+ break;
+ goto err;
+ }
+
+ nr_used++;
+ if (end)
+ break;
+ }
+
+ ff->ph->env.nr_cpu_pmu_caps_nodes = (u32)nr_used;
+ ff->ph->env.cpu_pmu_caps_nodes = nodes;
+ return 0;
+
+err:
+ for (i = 0; i < nr_used; i++) {
+ free(nodes[i].cpu_pmu_caps);
+ free(nodes[i].pmu_name);
+ }
+
+ free(nodes);
+ return ret;
+}
+
#define FEAT_OPR(n, func, __full_only) \
[HEADER_##n] = { \
.name = __stringify(n), \
--
2.7.4
\
 
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