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Date: Thu, 10 Sep 2015 10:12:50 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: "Liang, Kan" <kan.liang@...el.com>
Cc: Ingo Molnar <mingo@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Hunter, Adrian" <adrian.hunter@...el.com>,
Borislav Petkov <bp@...e.de>, David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Stephane Eranian <eranian@...gle.com>,
Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method
Em Wed, Sep 09, 2015 at 09:41:18PM +0000, Liang, Kan escreveu:
> > - for (i = 0; i < tp->cpu_nr; i++) {
> > - ret = do_write(fd, &tp->core_id[i], sizeof(int));
> > + perf_env__read_cpu_topology_map(&perf_env);
> > +
>
> I think we need to handle error here.
Ok, adding a test, updated patch below. While doing that, noticed that
the in the thread_sib case the "ret = do_something()" doesn't makes the
whole function fail, will fix later.
- Arnaldo
commit c98989f4a47a6fd3f3f8bd937b96faaced8b203e
Author: Arnaldo Carvalho de Melo <acme@...hat.com>
Date: Wed Sep 9 10:37:01 2015 -0300
perf env: Introduce read_cpu_topology_map() method
Out of the code to write the cpu topology map in the perf.data file
header.
Now if one needs the CPU topology map for the running machine, one needs
to call perf_env__read_cpu_topology_map(perf_env) and the info will be
stored in perf_env.cpu.
For now we're using a global perf_env variable, that will have its
contents freed after we run a builtin.
v2: Check perf_env__read_cpu_topology_map() return in
write_cpu_topology() (Kan Liang)
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1441828225-667-5-git-send-email-acme@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index f2fc019b3671..1fded922bcc8 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -8,6 +8,7 @@
*/
#include "builtin.h"
+#include "util/env.h"
#include "util/exec_cmd.h"
#include "util/cache.h"
#include "util/quote.h"
@@ -369,6 +370,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
status = p->fn(argc, argv, prefix);
exit_browser(status);
+ perf_env__exit(&perf_env);
if (status)
return status & 0xff;
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index ca1e33a2203e..6af4f7c36820 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -1,3 +1,4 @@
+#include "cpumap.h"
#include "env.h"
#include "util.h"
@@ -56,3 +57,30 @@ out_free:
out_enomem:
return -ENOMEM;
}
+
+int perf_env__read_cpu_topology_map(struct perf_env *env)
+{
+ int cpu, nr_cpus;
+
+ if (env->cpu != NULL)
+ return 0;
+
+ if (env->nr_cpus_avail == 0)
+ env->nr_cpus_avail = sysconf(_SC_NPROCESSORS_CONF);
+
+ nr_cpus = env->nr_cpus_avail;
+ if (nr_cpus == -1)
+ return -EINVAL;
+
+ env->cpu = calloc(nr_cpus, sizeof(env->cpu[0]));
+ if (env->cpu == NULL)
+ return -ENOMEM;
+
+ 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->nr_cpus_avail = nr_cpus;
+ return 0;
+}
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 70124d9a1624..c4e36323d91e 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -38,4 +38,6 @@ void perf_env__exit(struct perf_env *env);
int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]);
+int perf_env__read_cpu_topology_map(struct perf_env *env);
+
#endif /* __PERF_ENV_H */
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 151b8310ac70..d6437465f70f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -415,8 +415,6 @@ struct cpu_topo {
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)
@@ -479,9 +477,6 @@ 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);
@@ -509,7 +504,7 @@ static struct cpu_topo *build_cpu_topology(void)
struct cpu_topo *tp;
void *addr;
u32 nr, i;
- size_t sz, sz_id;
+ size_t sz;
long ncpus;
int ret = -1;
@@ -520,9 +515,8 @@ 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 + 2 * sz_id);
+ addr = calloc(1, sizeof(*tp) + 2 * sz);
if (!addr)
return NULL;
@@ -532,10 +526,6 @@ static struct cpu_topo *build_cpu_topology(void)
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);
@@ -554,7 +544,7 @@ static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
{
struct cpu_topo *tp;
u32 i;
- int ret;
+ int ret, j;
tp = build_cpu_topology();
if (!tp)
@@ -579,11 +569,17 @@ static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
break;
}
- for (i = 0; i < tp->cpu_nr; i++) {
- ret = do_write(fd, &tp->core_id[i], sizeof(int));
+ ret = perf_env__read_cpu_topology_map(&perf_env);
+ if (ret < 0)
+ goto done;
+
+ for (j = 0; j < perf_env.nr_cpus_avail; j++) {
+ ret = do_write(fd, &perf_env.cpu[j].core_id,
+ sizeof(perf_env.cpu[j].core_id));
if (ret < 0)
return ret;
- ret = do_write(fd, &tp->phy_pkg_id[i], sizeof(int));
+ ret = do_write(fd, &perf_env.cpu[j].socket_id,
+ sizeof(perf_env.cpu[j].socket_id));
if (ret < 0)
return ret;
}
--
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