[tip:perf/core] perf tools: Store the cpu socket and core ids in the perf.data header
From: tip-bot for Kan Liang
Date: Tue Sep 08 2015 - 10:32:26 EST
Commit-ID: 2bb00d2f95193aea5bfa98392907273115c96920
Gitweb: http://git.kernel.org/tip/2bb00d2f95193aea5bfa98392907273115c96920
Author: Kan Liang <kan.liang@xxxxxxxxx>
AuthorDate: Tue, 1 Sep 2015 09:58:12 -0400
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 2 Sep 2015 16:30:47 -0300
perf tools: Store the cpu socket and core ids in the perf.data header
This patch stores the cpu socket_id and core_id in a perf.data header,
and reads them into the perf_env struct when processing perf.data files.
The changes modifies the CPU_TOPOLOGY section, making sure it is
backward/forward compatible.
The patch checks the section size before reading the core and socket ids.
It never reads data crossing the section boundary. An old perf binary
without this patch can also correctly read the perf.data from a new perf
with this patch.
Because the new info is added at the end of the cpu_topology section, an
old perf tool ignores the extra data.
Examples:
1. New perf with this patch read perf.data from an old perf without the
patch:
$ perf_new report -i perf_old.data --header-only -I
......
# sibling threads : 33
# sibling threads : 34
# sibling threads : 35
# Core ID and Socket ID information is not available
# node0 meminfo : total = 32823872 kB, free = 29315548 kB
# node0 cpu list : 0-17,36-53
......
2. Old perf without the patch reads perf.data from a new perf with the
patch:
$ perf_old report -i perf_new.data --header-only -I
......
# sibling threads : 33
# sibling threads : 34
# sibling threads : 35
# node0 meminfo : total = 32823872 kB, free = 29190932 kB
# node0 cpu list : 0-17,36-53
......
3. New perf read new perf.data:
$ perf_new report -i perf_new.data --header-only -I
......
# sibling threads : 33
# sibling threads : 34
# sibling threads : 35
# CPU 0: Core ID 0, Socket ID 0
# CPU 1: Core ID 1, Socket ID 0
......
# CPU 61: Core ID 10, Socket ID 1
# CPU 62: Core ID 11, Socket ID 1
# CPU 63: Core ID 16, Socket ID 1
# node0 meminfo : total = 32823872 kB, free = 29190932 kB
# node0 cpu list : 0-17,36-53
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1441115893-22006-2-git-send-email-kan.liang@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/header.c | 94 ++++++++++++++++++++++++++++++++++++++++++++---
tools/perf/util/header.h | 6 +++
tools/perf/util/session.c | 1 +
3 files changed, 96 insertions(+), 5 deletions(-)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 4181454..8fd7b7d 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -88,6 +88,9 @@ int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
return err;
}
+#define string_size(str) \
+ (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
+
static int do_write_string(int fd, const char *str)
{
u32 len, olen;
@@ -441,10 +444,13 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
struct cpu_topo {
+ u32 cpu_nr;
u32 core_sib;
u32 thread_sib;
char **core_siblings;
char **thread_siblings;
+ int *core_id;
+ int *phy_pkg_id;
};
static int build_cpu_topo(struct cpu_topo *tp, int cpu)
@@ -507,6 +513,9 @@ try_threads:
}
ret = 0;
done:
+ tp->core_id[cpu] = cpu_map__get_core_id(cpu);
+ tp->phy_pkg_id[cpu] = cpu_map__get_socket_id(cpu);
+
if(fp)
fclose(fp);
free(buf);
@@ -534,7 +543,7 @@ static struct cpu_topo *build_cpu_topology(void)
struct cpu_topo *tp;
void *addr;
u32 nr, i;
- size_t sz;
+ size_t sz, sz_id;
long ncpus;
int ret = -1;
@@ -545,17 +554,22 @@ static struct cpu_topo *build_cpu_topology(void)
nr = (u32)(ncpus & UINT_MAX);
sz = nr * sizeof(char *);
+ sz_id = nr * sizeof(int);
- addr = calloc(1, sizeof(*tp) + 2 * sz);
+ addr = calloc(1, sizeof(*tp) + 2 * sz + 2 * sz_id);
if (!addr)
return NULL;
tp = addr;
-
+ tp->cpu_nr = nr;
addr += sizeof(*tp);
tp->core_siblings = addr;
addr += sz;
tp->thread_siblings = addr;
+ addr += sz;
+ tp->core_id = addr;
+ addr += sz_id;
+ tp->phy_pkg_id = addr;
for (i = 0; i < nr; i++) {
ret = build_cpu_topo(tp, i);
@@ -598,6 +612,15 @@ static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
if (ret < 0)
break;
}
+
+ for (i = 0; i < tp->cpu_nr; i++) {
+ ret = do_write(fd, &tp->core_id[i], sizeof(int));
+ if (ret < 0)
+ return ret;
+ ret = do_write(fd, &tp->phy_pkg_id[i], sizeof(int));
+ if (ret < 0)
+ return ret;
+ }
done:
free_cpu_topo(tp);
return ret;
@@ -938,6 +961,7 @@ static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
{
int nr, i;
char *str;
+ int cpu_nr = ph->env.nr_cpus_online;
nr = ph->env.nr_sibling_cores;
str = ph->env.sibling_cores;
@@ -954,6 +978,13 @@ static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
fprintf(fp, "# sibling threads : %s\n", str);
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");
}
static void free_event_desc(struct perf_evsel *events)
@@ -1582,7 +1613,7 @@ error:
return -1;
}
-static int process_cpu_topology(struct perf_file_section *section __maybe_unused,
+static int process_cpu_topology(struct perf_file_section *section,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
@@ -1590,15 +1621,22 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
u32 nr, i;
char *str;
struct strbuf sb;
+ int cpu_nr = ph->env.nr_cpus_online;
+ u64 size = 0;
+
+ ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
+ if (!ph->env.cpu)
+ return -1;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
- return -1;
+ goto free_cpu;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_sibling_cores = nr;
+ size += sizeof(u32);
strbuf_init(&sb, 128);
for (i = 0; i < nr; i++) {
@@ -1608,6 +1646,7 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
/* include a NULL character at the end */
strbuf_add(&sb, str, strlen(str) + 1);
+ size += string_size(str);
free(str);
}
ph->env.sibling_cores = strbuf_detach(&sb, NULL);
@@ -1620,6 +1659,7 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
nr = bswap_32(nr);
ph->env.nr_sibling_threads = nr;
+ size += sizeof(u32);
for (i = 0; i < nr; i++) {
str = do_read_string(fd, ph);
@@ -1628,13 +1668,57 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
/* include a NULL character at the end */
strbuf_add(&sb, str, strlen(str) + 1);
+ size += string_size(str);
free(str);
}
ph->env.sibling_threads = strbuf_detach(&sb, NULL);
+
+ /*
+ * The header may be from old perf,
+ * which doesn't include core id and socket id information.
+ */
+ if (section->size <= size) {
+ zfree(&ph->env.cpu);
+ return 0;
+ }
+
+ for (i = 0; i < (u32)cpu_nr; i++) {
+ ret = readn(fd, &nr, sizeof(nr));
+ if (ret != sizeof(nr))
+ goto free_cpu;
+
+ if (ph->needs_swap)
+ nr = bswap_32(nr);
+
+ if (nr > (u32)cpu_nr) {
+ pr_debug("core_id number is too big."
+ "You may need to upgrade the perf tool.\n");
+ goto free_cpu;
+ }
+ ph->env.cpu[i].core_id = nr;
+
+ ret = readn(fd, &nr, sizeof(nr));
+ if (ret != sizeof(nr))
+ goto free_cpu;
+
+ if (ph->needs_swap)
+ nr = bswap_32(nr);
+
+ if (nr > (u32)cpu_nr) {
+ pr_debug("socket_id number is too big."
+ "You may need to upgrade the perf tool.\n");
+ goto free_cpu;
+ }
+
+ ph->env.cpu[i].socket_id = nr;
+ }
+
return 0;
error:
strbuf_release(&sb);
+free_cpu:
+ zfree(&ph->env.cpu);
return -1;
}
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 396e496..975d803 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -66,6 +66,11 @@ struct perf_header;
int perf_file_header__read(struct perf_file_header *header,
struct perf_header *ph, int fd);
+struct cpu_topology_map {
+ int socket_id;
+ int core_id;
+};
+
struct perf_env {
char *hostname;
char *os_release;
@@ -89,6 +94,7 @@ struct perf_env {
char *sibling_threads;
char *numa_nodes;
char *pmu_mappings;
+ struct cpu_topology_map *cpu;
};
struct perf_header {
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 8a4537e..61669be 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -185,6 +185,7 @@ static void perf_session_env__exit(struct perf_env *env)
zfree(&env->sibling_threads);
zfree(&env->numa_nodes);
zfree(&env->pmu_mappings);
+ zfree(&env->cpu);
}
void perf_session__delete(struct perf_session *session)
--
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