[PATCH 1/3] perf header: Add die information in CPU topology

From: kan . liang
Date: Thu May 23 2019 - 16:45:00 EST

From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

With the new CPUID.1F, a new level type of CPU topology, 'die', is
introduced. The 'die' information in CPU topology should be added in
perf header.

To be compatible with old perf.data, the patch checks the section size
before reading the die information. The new info is added at the end of
the cpu_topology section, the old perf tool ignores the extra data.
It never reads data crossing the section boundary.

The new perf tool with the patch can be used on legacy kernel. Add a
new function check_x86_die_exists() to check if die topology
information is supported by kernel. The function only check X86 and
CPU 0. Assuming other CPUs have same topology.

Use similar method for core and socket to support die id and sibling
dies string.

Add cpu_map__get_die_id() in cpumap.c to fetch die id information.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---
tools/perf/Documentation/perf.data-file-format.txt | 9 +-
tools/perf/util/cpumap.c | 7 ++
tools/perf/util/cpumap.h | 1 +
tools/perf/util/cputopo.c | 83 ++++++++++++++--
tools/perf/util/cputopo.h | 7 +-
tools/perf/util/env.c | 1 +
tools/perf/util/env.h | 3 +
tools/perf/util/header.c | 104 +++++++++++++++++++--
8 files changed, 193 insertions(+), 22 deletions(-)

diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index 6967e9b..c731416 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -153,7 +153,7 @@ struct {

String lists defining the core and CPU threads topology.
The string lists are followed by a variable length array
-which contains core_id and socket_id of each cpu.
+which contains core_id, die_id (for x86) and socket_id of each cpu.
The number of entries can be determined by the size of the
section minus the sizes of both string lists.

@@ -162,14 +162,19 @@ struct {
struct perf_header_string_list threads; /* Variable length */
struct {
uint32_t core_id;
+ uint32_t die_id;
uint32_t socket_id;
} cpus[nr]; /* Variable length records */
};

Example:
- sibling cores : 0-3
+ sibling cores : 0-8
+ sibling dies : 0-3
+ sibling dies : 4-7
sibling threads : 0-1
sibling threads : 2-3
+ sibling threads : 4-5
+ sibling threads : 6-7

HEADER_NUMA_TOPOLOGY = 14,

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 0b59922..7db1365 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -373,6 +373,13 @@ int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
return 0;
}

+int cpu_map__get_die_id(int cpu)
+{
+ int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
+
+ return ret ?: value;
+}
+
int cpu_map__get_core_id(int cpu)
{
int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index f00ce62..6762ff9 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -25,6 +25,7 @@ size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size);
size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp);
int cpu_map__get_socket_id(int cpu);
int cpu_map__get_socket(struct cpu_map *map, int idx, void *data);
+int cpu_map__get_die_id(int cpu);
int cpu_map__get_core_id(int cpu);
int cpu_map__get_core(struct cpu_map *map, int idx, void *data);
int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp);
diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index ece0710..f6e7db7 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <sys/param.h>
+#include <sys/utsname.h>
#include <inttypes.h>
#include <api/fs/fs.h>

@@ -8,9 +9,10 @@
#include "util.h"
#include "env.h"

-
#define CORE_SIB_FMT \
"%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
+#define DIE_SIB_FMT \
+ "%s/devices/system/cpu/cpu%d/topology/die_cpus_list"
#define THRD_SIB_FMT \
"%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
#define NODE_ONLINE_FMT \
@@ -20,7 +22,26 @@
#define NODE_CPULIST_FMT \
"%s/devices/system/node/node%d/cpulist"

-static int build_cpu_topology(struct cpu_topology *tp, int cpu)
+bool check_x86_die_exists(void)
+{
+ char filename[MAXPATHLEN];
+ struct utsname uts;
+
+ if (uname(&uts) < 0)
+ return false;
+
+ if (strncmp(uts.machine, "x86_64", 6))
+ return false;
+
+ scnprintf(filename, MAXPATHLEN, DIE_SIB_FMT,
+ sysfs__mountpoint(), 0);
+ if (access(filename, F_OK) == -1)
+ return false;
+
+ return true;
+}
+
+static int build_cpu_topology(struct cpu_topology *tp, int cpu, bool has_die)
{
FILE *fp;
char filename[MAXPATHLEN];
@@ -34,12 +55,12 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
sysfs__mountpoint(), cpu);
fp = fopen(filename, "r");
if (!fp)
- goto try_threads;
+ goto try_dies;

sret = getline(&buf, &len, fp);
fclose(fp);
if (sret <= 0)
- goto try_threads;
+ goto try_dies;

p = strchr(buf, '\n');
if (p)
@@ -57,6 +78,35 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
}
ret = 0;

+try_dies:
+ if (has_die) {
+ scnprintf(filename, MAXPATHLEN, DIE_SIB_FMT,
+ sysfs__mountpoint(), cpu);
+ fp = fopen(filename, "r");
+ if (!fp)
+ goto try_threads;
+
+ sret = getline(&buf, &len, fp);
+ fclose(fp);
+ if (sret <= 0)
+ goto try_threads;
+
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+
+ for (i = 0; i < tp->die_sib; i++) {
+ if (!strcmp(buf, tp->die_siblings[i]))
+ break;
+ }
+ if (i == tp->die_sib) {
+ tp->die_siblings[i] = buf;
+ tp->die_sib++;
+ buf = NULL;
+ len = 0;
+ }
+ ret = 0;
+ }
try_threads:
scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,
sysfs__mountpoint(), cpu);
@@ -88,7 +138,7 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
return ret;
}

-void cpu_topology__delete(struct cpu_topology *tp)
+void cpu_topology__delete(struct cpu_topology *tp, bool has_die)
{
u32 i;

@@ -98,17 +148,22 @@ void cpu_topology__delete(struct cpu_topology *tp)
for (i = 0 ; i < tp->core_sib; i++)
zfree(&tp->core_siblings[i]);

+ if (has_die) {
+ for (i = 0 ; i < tp->die_sib; i++)
+ zfree(&tp->die_siblings[i]);
+ }
+
for (i = 0 ; i < tp->thread_sib; i++)
zfree(&tp->thread_siblings[i]);

free(tp);
}

-struct cpu_topology *cpu_topology__new(void)
+struct cpu_topology *cpu_topology__new(bool has_die)
{
struct cpu_topology *tp = NULL;
void *addr;
- u32 nr, i;
+ u32 nr, i, nr_addr;
size_t sz;
long ncpus;
int ret = -1;
@@ -126,7 +181,11 @@ struct cpu_topology *cpu_topology__new(void)
nr = (u32)(ncpus & UINT_MAX);

sz = nr * sizeof(char *);
- addr = calloc(1, sizeof(*tp) + 2 * sz);
+ if (has_die)
+ nr_addr = 3;
+ else
+ nr_addr = 2;
+ addr = calloc(1, sizeof(*tp) + nr_addr * sz);
if (!addr)
goto out_free;

@@ -134,13 +193,17 @@ struct cpu_topology *cpu_topology__new(void)
addr += sizeof(*tp);
tp->core_siblings = addr;
addr += sz;
+ if (has_die) {
+ tp->die_siblings = addr;
+ addr += sz;
+ }
tp->thread_siblings = addr;

for (i = 0; i < nr; i++) {
if (!cpu_map__has(map, i))
continue;

- ret = build_cpu_topology(tp, i);
+ ret = build_cpu_topology(tp, i, has_die);
if (ret < 0)
break;
}
@@ -148,7 +211,7 @@ struct cpu_topology *cpu_topology__new(void)
out_free:
cpu_map__put(map);
if (ret) {
- cpu_topology__delete(tp);
+ cpu_topology__delete(tp, has_die);
tp = NULL;
}
return tp;
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
index 47a97e7..cb4e6fe 100644
--- a/tools/perf/util/cputopo.h
+++ b/tools/perf/util/cputopo.h
@@ -7,8 +7,10 @@

struct cpu_topology {
u32 core_sib;
+ u32 die_sib;
u32 thread_sib;
char **core_siblings;
+ char **die_siblings;
char **thread_siblings;
};

@@ -24,8 +26,9 @@ struct numa_topology {
struct numa_topology_node nodes[0];
};

-struct cpu_topology *cpu_topology__new(void);
-void cpu_topology__delete(struct cpu_topology *tp);
+bool check_x86_die_exists(void);
+struct cpu_topology *cpu_topology__new(bool has_die);
+void cpu_topology__delete(struct cpu_topology *tp, bool has_die);

struct numa_topology *numa_topology__new(void);
void numa_topology__delete(struct numa_topology *tp);
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 6a3eaf7..1cc7a18 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -246,6 +246,7 @@ int perf_env__read_cpu_topology_map(struct perf_env *env)
for (cpu = 0; cpu < nr_cpus; ++cpu) {
env->cpu[cpu].core_id = cpu_map__get_core_id(cpu);
env->cpu[cpu].socket_id = cpu_map__get_socket_id(cpu);
+ env->cpu[cpu].die_id = cpu_map__get_die_id(cpu);
}

env->nr_cpus_avail = nr_cpus;
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 271a90b..d5d9865 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -9,6 +9,7 @@

struct cpu_topology_map {
int socket_id;
+ int die_id;
int core_id;
};

@@ -49,6 +50,7 @@ struct perf_env {

int nr_cmdline;
int nr_sibling_cores;
+ int nr_sibling_dies;
int nr_sibling_threads;
int nr_numa_nodes;
int nr_memory_nodes;
@@ -57,6 +59,7 @@ struct perf_env {
char *cmdline;
const char **cmdline_argv;
char *sibling_cores;
+ char *sibling_dies;
char *sibling_threads;
char *pmu_mappings;
struct cpu_topology_map *cpu;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 847ae51..faa1e38 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -561,8 +561,11 @@ static int write_cpu_topology(struct feat_fd *ff,
struct cpu_topology *tp;
u32 i;
int ret, j;
+ bool has_die;

- tp = cpu_topology__new();
+ has_die = check_x86_die_exists();
+
+ tp = cpu_topology__new(has_die);
if (!tp)
return -1;

@@ -599,8 +602,29 @@ static int write_cpu_topology(struct feat_fd *ff,
if (ret < 0)
return ret;
}
+
+ if (!has_die)
+ goto done;
+
+ ret = do_write(ff, &tp->die_sib, sizeof(tp->die_sib));
+ if (ret < 0)
+ goto done;
+
+ for (i = 0; i < tp->die_sib; i++) {
+ ret = do_write_string(ff, tp->die_siblings[i]);
+ if (ret < 0)
+ goto done;
+ }
+
+ for (j = 0; j < perf_env.nr_cpus_avail; j++) {
+ ret = do_write(ff, &perf_env.cpu[j].die_id,
+ sizeof(perf_env.cpu[j].die_id));
+ if (ret < 0)
+ return ret;
+ }
+
done:
- cpu_topology__delete(tp);
+ cpu_topology__delete(tp, has_die);
return ret;
}

@@ -1428,6 +1452,8 @@ static void print_cmdline(struct feat_fd *ff, FILE *fp)
fputc('\n', fp);
}

+static bool has_die;
+
static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
{
struct perf_header *ph = ff->ph;
@@ -1443,6 +1469,16 @@ static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
str += strlen(str) + 1;
}

+ if (has_die) {
+ nr = ph->env.nr_sibling_dies;
+ str = ph->env.sibling_dies;
+
+ for (i = 0; i < nr; i++) {
+ fprintf(fp, "# sibling dies : %s\n", str);
+ str += strlen(str) + 1;
+ }
+ }
+
nr = ph->env.nr_sibling_threads;
str = ph->env.sibling_threads;

@@ -1451,12 +1487,28 @@ static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
str += strlen(str) + 1;
}

- if (ph->env.cpu != NULL) {
- for (i = 0; i < cpu_nr; i++)
- fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
- ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
- } else
- fprintf(fp, "# Core ID and Socket ID information is not available\n");
+ if (has_die) {
+ if (ph->env.cpu != NULL) {
+ for (i = 0; i < cpu_nr; i++)
+ fprintf(fp, "# CPU %d: Core ID %d, "
+ "Die ID %d, Socket ID %d\n",
+ i, ph->env.cpu[i].core_id,
+ ph->env.cpu[i].die_id,
+ ph->env.cpu[i].socket_id);
+ } else
+ fprintf(fp, "# Core ID, Die ID and Socket ID "
+ "information is not available\n");
+ } else {
+ if (ph->env.cpu != NULL) {
+ for (i = 0; i < cpu_nr; i++)
+ fprintf(fp, "# CPU %d: Core ID %d, "
+ "Socket ID %d\n",
+ i, ph->env.cpu[i].core_id,
+ ph->env.cpu[i].socket_id);
+ } else
+ fprintf(fp, "# Core ID and Socket ID "
+ "information is not available\n");
+ }
}

static void print_clockid(struct feat_fd *ff, FILE *fp)
@@ -2214,6 +2266,7 @@ static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
goto free_cpu;

ph->env.cpu[i].core_id = nr;
+ size += sizeof(u32);

if (do_read_u32(ff, &nr))
goto free_cpu;
@@ -2225,7 +2278,42 @@ static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
}

ph->env.cpu[i].socket_id = nr;
+ size += sizeof(u32);
+ }
+
+ /*
+ * The header may be from old perf,
+ * which doesn't include die information.
+ */
+ if (ff->size <= size)
+ return 0;
+
+ if (do_read_u32(ff, &nr))
+ return -1;
+
+ ph->env.nr_sibling_dies = nr;
+ size += sizeof(u32);
+
+ for (i = 0; i < nr; i++) {
+ str = do_read_string(ff);
+ if (!str)
+ goto error;
+
+ /* include a NULL character at the end */
+ if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+ goto error;
+ size += string_size(str);
+ free(str);
+ }
+ ph->env.sibling_dies = strbuf_detach(&sb, NULL);
+
+ for (i = 0; i < (u32)cpu_nr; i++) {
+ if (do_read_u32(ff, &nr))
+ goto free_cpu;
+
+ ph->env.cpu[i].die_id = nr;
}
+ has_die = true;

return 0;

--
2.7.4