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Subject[PATCH 32/49] perf header: Support HYBRID_TOPOLOGY feature
Date
From: Jin Yao <yao.jin@linux.intel.com>

It would be useful to let user know the hybrid topology.
For example, the HYBRID_TOPOLOGY feature in header indicates which
cpus are core cpus, and which cpus are atom cpus.

With this patch,

On a hybrid platform:

root@otcpl-adl-s-2:~# ./perf report --header-only -I
...
# cpu_core cpu list : 0-15
# cpu_atom cpu list : 16-23

On a non-hybrid platform:

root@kbl-ppc:~# ./perf report --header-only -I
...
# missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA HYBRID_TOPOLOGY

It just shows HYBRID_TOPOLOGY is missing feature.

Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/cputopo.c | 80 +++++++++++++++++++++++++++++++++++++++++
tools/perf/util/cputopo.h | 13 +++++++
tools/perf/util/env.c | 6 ++++
tools/perf/util/env.h | 7 ++++
tools/perf/util/header.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/header.h | 1 +
tools/perf/util/pmu.c | 1 -
tools/perf/util/pmu.h | 1 +
8 files changed, 200 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 1b52402..4a00fb8 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -12,6 +12,7 @@
#include "cpumap.h"
#include "debug.h"
#include "env.h"
+#include "pmu.h"

#define CORE_SIB_FMT \
"%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
@@ -351,3 +352,82 @@ void numa_topology__delete(struct numa_topology *tp)

free(tp);
}
+
+static int load_hybrid_node(struct hybrid_topology_node *node,
+ struct perf_pmu *pmu)
+{
+ const char *sysfs;
+ char path[PATH_MAX];
+ char *buf = NULL, *p;
+ FILE *fp;
+ size_t len = 0;
+
+ node->pmu_name = strdup(pmu->name);
+ if (!node->pmu_name)
+ return -1;
+
+ sysfs = sysfs__mountpoint();
+ snprintf(path, PATH_MAX, CPUS_TEMPLATE_CPU, sysfs, pmu->name);
+
+ fp = fopen(path, "r");
+ if (!fp)
+ goto err;
+
+ if (getline(&buf, &len, fp) <= 0) {
+ fclose(fp);
+ goto err;
+ }
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ fclose(fp);
+ node->cpus = buf;
+ return 0;
+
+err:
+ zfree(&node->pmu_name);
+ free(buf);
+ return -1;
+}
+
+struct hybrid_topology *hybrid_topology__new(void)
+{
+ struct perf_pmu *pmu;
+ struct hybrid_topology *tp = NULL;
+ u32 nr = 0, i = 0;
+
+ perf_pmu__for_each_hybrid_pmus(pmu)
+ nr++;
+
+ if (nr == 0)
+ return NULL;
+
+ tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0]) * nr);
+ if (!tp)
+ return NULL;
+
+ tp->nr = nr;
+ perf_pmu__for_each_hybrid_pmus(pmu) {
+ if (load_hybrid_node(&tp->nodes[i], pmu)) {
+ hybrid_topology__delete(tp);
+ return NULL;
+ }
+ i++;
+ }
+
+ return tp;
+}
+
+void hybrid_topology__delete(struct hybrid_topology *tp)
+{
+ u32 i;
+
+ for (i = 0; i < tp->nr; i++) {
+ zfree(&tp->nodes[i].pmu_name);
+ zfree(&tp->nodes[i].cpus);
+ }
+
+ free(tp);
+}
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
index 6201c37..d9af971 100644
--- a/tools/perf/util/cputopo.h
+++ b/tools/perf/util/cputopo.h
@@ -25,10 +25,23 @@ struct numa_topology {
struct numa_topology_node nodes[];
};

+struct hybrid_topology_node {
+ char *pmu_name;
+ char *cpus;
+};
+
+struct hybrid_topology {
+ u32 nr;
+ struct hybrid_topology_node nodes[];
+};
+
struct cpu_topology *cpu_topology__new(void);
void cpu_topology__delete(struct cpu_topology *tp);

struct numa_topology *numa_topology__new(void);
void numa_topology__delete(struct numa_topology *tp);

+struct hybrid_topology *hybrid_topology__new(void);
+void hybrid_topology__delete(struct hybrid_topology *tp);
+
#endif /* __PERF_CPUTOPO_H */
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 9130f6f..9e05eca 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -202,6 +202,12 @@ void perf_env__exit(struct perf_env *env)
for (i = 0; i < env->nr_memory_nodes; i++)
zfree(&env->memory_nodes[i].set);
zfree(&env->memory_nodes);
+
+ for (i = 0; i < env->nr_hybrid_nodes; i++) {
+ perf_cpu_map__put(env->hybrid_nodes[i].map);
+ zfree(&env->hybrid_nodes[i].pmu_name);
+ }
+ zfree(&env->hybrid_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 ca249bf..9ca7633 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -37,6 +37,11 @@ struct memory_node {
unsigned long *set;
};

+struct hybrid_node {
+ char *pmu_name;
+ struct perf_cpu_map *map;
+};
+
struct perf_env {
char *hostname;
char *os_release;
@@ -59,6 +64,7 @@ struct perf_env {
int nr_pmu_mappings;
int nr_groups;
int nr_cpu_pmu_caps;
+ int nr_hybrid_nodes;
char *cmdline;
const char **cmdline_argv;
char *sibling_cores;
@@ -77,6 +83,7 @@ struct perf_env {
struct numa_node *numa_nodes;
struct memory_node *memory_nodes;
unsigned long long memory_bsize;
+ struct hybrid_node *hybrid_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 c4ed3dc..6bcd959 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -932,6 +932,40 @@ static int write_clock_data(struct feat_fd *ff,
return do_write(ff, data64, sizeof(*data64));
}

+static int write_hybrid_topology(struct feat_fd *ff,
+ struct evlist *evlist __maybe_unused)
+{
+ struct hybrid_topology *tp;
+ int ret;
+ u32 i;
+
+ tp = hybrid_topology__new();
+ if (!tp)
+ return -1;
+
+ ret = do_write(ff, &tp->nr, sizeof(u32));
+ if (ret < 0)
+ goto err;
+
+ for (i = 0; i < tp->nr; i++) {
+ struct hybrid_topology_node *n = &tp->nodes[i];
+
+ ret = do_write_string(ff, n->pmu_name);
+ if (ret < 0)
+ goto err;
+
+ ret = do_write_string(ff, n->cpus);
+ if (ret < 0)
+ goto err;
+ }
+
+ ret = 0;
+
+err:
+ hybrid_topology__delete(tp);
+ return ret;
+}
+
static int write_dir_format(struct feat_fd *ff,
struct evlist *evlist __maybe_unused)
{
@@ -1623,6 +1657,19 @@ static void print_clock_data(struct feat_fd *ff, FILE *fp)
clockid_name(clockid));
}

+static void print_hybrid_topology(struct feat_fd *ff, FILE *fp)
+{
+ int i;
+ struct hybrid_node *n;
+
+ for (i = 0; i < ff->ph->env.nr_hybrid_nodes; i++) {
+ n = &ff->ph->env.hybrid_nodes[i];
+
+ fprintf(fp, "# %s cpu list : ", n->pmu_name);
+ cpu_map__fprintf(n->map, fp);
+ }
+}
+
static void print_dir_format(struct feat_fd *ff, FILE *fp)
{
struct perf_session *session;
@@ -2849,6 +2896,50 @@ static int process_clock_data(struct feat_fd *ff,
return 0;
}

+static int process_hybrid_topology(struct feat_fd *ff,
+ void *data __maybe_unused)
+{
+ struct hybrid_node *nodes, *n;
+ u32 nr, i;
+ char *str;
+
+ /* nr nodes */
+ if (do_read_u32(ff, &nr))
+ return -1;
+
+ nodes = zalloc(sizeof(*nodes) * nr);
+ if (!nodes)
+ return -ENOMEM;
+
+ for (i = 0; i < nr; i++) {
+ n = &nodes[i];
+
+ n->pmu_name = do_read_string(ff);
+ if (!n->pmu_name)
+ goto error;
+
+ str = do_read_string(ff);
+ if (!str)
+ goto error;
+
+ n->map = perf_cpu_map__new(str);
+ free(str);
+ if (!n->map)
+ goto error;
+ }
+
+ ff->ph->env.nr_hybrid_nodes = nr;
+ ff->ph->env.hybrid_nodes = nodes;
+ return 0;
+
+error:
+ for (i = 0; i < nr; i++)
+ free(nodes[i].pmu_name);
+
+ free(nodes);
+ return -1;
+}
+
static int process_dir_format(struct feat_fd *ff,
void *_data __maybe_unused)
{
@@ -3117,6 +3208,7 @@ const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPR(COMPRESSED, compressed, false),
FEAT_OPR(CPU_PMU_CAPS, cpu_pmu_caps, false),
FEAT_OPR(CLOCK_DATA, clock_data, false),
+ FEAT_OPN(HYBRID_TOPOLOGY, hybrid_topology, true),
};

struct header_print_data {
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 2aca717..3f12ec0 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -45,6 +45,7 @@ enum {
HEADER_COMPRESSED,
HEADER_CPU_PMU_CAPS,
HEADER_CLOCK_DATA,
+ HEADER_HYBRID_TOPOLOGY,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 9a6c973..ca2fc67 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -607,7 +607,6 @@ static struct perf_cpu_map *__pmu_cpumask(const char *path)
*/
#define SYS_TEMPLATE_ID "./bus/event_source/devices/%s/identifier"
#define CPUS_TEMPLATE_UNCORE "%s/bus/event_source/devices/%s/cpumask"
-#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"

static struct perf_cpu_map *pmu_cpumask(const char *name)
{
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 5b727cf..ccffc05 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -20,6 +20,7 @@ enum {

#define PERF_PMU_FORMAT_BITS 64
#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
+#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"

struct perf_event_attr;

--
2.7.4
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