[PATCHv3 0/4] perf tools: Assorted fixes

[PATCHv3 0/4] perf tools: Assorted fixes

[Jiri Olsa]

hi,
sending assorted general fixes that queued
up in my other branches.

v3 changes:
  - fix for fixes found by Namhyung
  - new patch to use sysfs__mountpoint

v2 changes:
  - renamed the interface to struct cpu_topology/numa_topology
    plus related changes in function names
  - adding missing Fixes tag

Also available in here:
  https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/fixes

thanks,
jirka


---
Jiri Olsa (4):
      perf header: Fix wrong node write in NUMA_TOPOLOGY feature
      perf tools: Add cpu_topology object
      perf tools: Add numa_topology object
      perf tools: Use sysfs__mountpoint() when reading cpu topology

 tools/perf/util/Build     |   1 +
 tools/perf/util/cputopo.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/cputopo.h |  33 ++++++++++++++++++++++
 tools/perf/util/header.c  | 269 ++++++++++++++++++++--------------------------------------------------------------------------------------------------------------------------------------------------------
 4 files changed, 341 insertions(+), 239 deletions(-)
 create mode 100644 tools/perf/util/cputopo.c
 create mode 100644 tools/perf/util/cputopo.h

[PATCH 1/4] perf header: Fix wrong node write in NUMA_TOPOLOGY feature

[Jiri Olsa]

We are currently passing the node index instead of the
real node number.

Fixes: fbe96f29ce4b ("perf tools: Make perf.data more self-descriptive (v8)"
Link: http://lkml.kernel.org/n/tip-rbtlsr9ts23c89rki7d4s5sm@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 61ce197c5362..c66f26ec557a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -879,7 +879,7 @@ static int write_numa_topology(struct feat_fd *ff,
 		if (ret < 0)
 			break;
 
-		ret = write_topo_node(ff, i);
+		ret = write_topo_node(ff, j);
 		if (ret < 0)
 			break;
 	}
-- 
2.17.2

[PATCH 2/4] perf tools: Add cpu_topology object

[Jiri Olsa]

Making struct cpu_topo global and renaming it to
struct cpu_topology, so it can be used from record
command in following patches.

Adding following interface functions to load/free
cpu topology details:
  struct cpu_topology *cpu_topology__new(void);
  void cpu_topology__delete(struct cpu_topology *tp);

Moving it into separate object file cputopo.c together
with numa related object in following patches.

No functional change, the new interface will be used
in upcoming changes.

Link: http://lkml.kernel.org/n/tip-4g1sdzg0bvd5la96xw06y3en@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/Build     |   1 +
 tools/perf/util/cputopo.c | 144 ++++++++++++++++++++++++++++++++++++
 tools/perf/util/cputopo.h |  17 +++++
 tools/perf/util/header.c  | 150 +-------------------------------------
 4 files changed, 166 insertions(+), 146 deletions(-)
 create mode 100644 tools/perf/util/cputopo.c
 create mode 100644 tools/perf/util/cputopo.h

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index ca0741c91903..3008d49fa587 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -69,6 +69,7 @@ perf-y += hist.o
 perf-y += util.o
 perf-y += xyarray.o
 perf-y += cpumap.o
+perf-y += cputopo.o
 perf-y += cgroup.o
 perf-y += target.o
 perf-y += rblist.o
diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
new file mode 100644
index 000000000000..84470ed4e707
--- /dev/null
+++ b/tools/perf/util/cputopo.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <sys/param.h>
+
+#include "cputopo.h"
+#include "cpumap.h"
+#include "util.h"
+
+
+#define CORE_SIB_FMT \
+	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
+#define THRD_SIB_FMT \
+	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+
+static int build_cpu_topology(struct cpu_topology *tp, int cpu)
+{
+	FILE *fp;
+	char filename[MAXPATHLEN];
+	char *buf = NULL, *p;
+	size_t len = 0;
+	ssize_t sret;
+	u32 i = 0;
+	int ret = -1;
+
+	sprintf(filename, CORE_SIB_FMT, 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->core_sib; i++) {
+		if (!strcmp(buf, tp->core_siblings[i]))
+			break;
+	}
+	if (i == tp->core_sib) {
+		tp->core_siblings[i] = buf;
+		tp->core_sib++;
+		buf = NULL;
+		len = 0;
+	}
+	ret = 0;
+
+try_threads:
+	sprintf(filename, THRD_SIB_FMT, cpu);
+	fp = fopen(filename, "r");
+	if (!fp)
+		goto done;
+
+	if (getline(&buf, &len, fp) <= 0)
+		goto done;
+
+	p = strchr(buf, '\n');
+	if (p)
+		*p = '\0';
+
+	for (i = 0; i < tp->thread_sib; i++) {
+		if (!strcmp(buf, tp->thread_siblings[i]))
+			break;
+	}
+	if (i == tp->thread_sib) {
+		tp->thread_siblings[i] = buf;
+		tp->thread_sib++;
+		buf = NULL;
+	}
+	ret = 0;
+done:
+	if (fp)
+		fclose(fp);
+	free(buf);
+	return ret;
+}
+
+void cpu_topology__delete(struct cpu_topology *tp)
+{
+	u32 i;
+
+	if (!tp)
+		return;
+
+	for (i = 0 ; i < tp->core_sib; i++)
+		zfree(&tp->core_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 *tp = NULL;
+	void *addr;
+	u32 nr, i;
+	size_t sz;
+	long ncpus;
+	int ret = -1;
+	struct cpu_map *map;
+
+	ncpus = cpu__max_present_cpu();
+
+	/* build online CPU map */
+	map = cpu_map__new(NULL);
+	if (map == NULL) {
+		pr_debug("failed to get system cpumap\n");
+		return NULL;
+	}
+
+	nr = (u32)(ncpus & UINT_MAX);
+
+	sz = nr * sizeof(char *);
+	addr = calloc(1, sizeof(*tp) + 2 * sz);
+	if (!addr)
+		goto out_free;
+
+	tp = addr;
+	addr += sizeof(*tp);
+	tp->core_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);
+		if (ret < 0)
+			break;
+	}
+
+out_free:
+	cpu_map__put(map);
+	if (ret) {
+		cpu_topology__delete(tp);
+		tp = NULL;
+	}
+	return tp;
+}
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
new file mode 100644
index 000000000000..4b5f4112b6f8
--- /dev/null
+++ b/tools/perf/util/cputopo.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_CPUTOPO_H
+#define __PERF_CPUTOPO_H
+
+#include <linux/types.h>
+
+struct cpu_topology {
+	u32	  core_sib;
+	u32	  thread_sib;
+	char	**core_siblings;
+	char	**thread_siblings;
+};
+
+struct cpu_topology *cpu_topology__new(void);
+void cpu_topology__delete(struct cpu_topology *tp);
+
+#endif /* __PERF_CPUTOPO_H */
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c66f26ec557a..80ac57e6d38f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -39,6 +39,7 @@
 #include "tool.h"
 #include "time-utils.h"
 #include "units.h"
+#include "cputopo.h"
 
 #include "sane_ctype.h"
 
@@ -557,158 +558,15 @@ static int write_cmdline(struct feat_fd *ff,
 	return 0;
 }
 
-#define CORE_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
-#define THRD_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
-
-struct cpu_topo {
-	u32 core_sib;
-	u32 thread_sib;
-	char **core_siblings;
-	char **thread_siblings;
-};
-
-static int build_cpu_topo(struct cpu_topo *tp, int cpu)
-{
-	FILE *fp;
-	char filename[MAXPATHLEN];
-	char *buf = NULL, *p;
-	size_t len = 0;
-	ssize_t sret;
-	u32 i = 0;
-	int ret = -1;
-
-	sprintf(filename, CORE_SIB_FMT, 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->core_sib; i++) {
-		if (!strcmp(buf, tp->core_siblings[i]))
-			break;
-	}
-	if (i == tp->core_sib) {
-		tp->core_siblings[i] = buf;
-		tp->core_sib++;
-		buf = NULL;
-		len = 0;
-	}
-	ret = 0;
-
-try_threads:
-	sprintf(filename, THRD_SIB_FMT, cpu);
-	fp = fopen(filename, "r");
-	if (!fp)
-		goto done;
-
-	if (getline(&buf, &len, fp) <= 0)
-		goto done;
-
-	p = strchr(buf, '\n');
-	if (p)
-		*p = '\0';
-
-	for (i = 0; i < tp->thread_sib; i++) {
-		if (!strcmp(buf, tp->thread_siblings[i]))
-			break;
-	}
-	if (i == tp->thread_sib) {
-		tp->thread_siblings[i] = buf;
-		tp->thread_sib++;
-		buf = NULL;
-	}
-	ret = 0;
-done:
-	if(fp)
-		fclose(fp);
-	free(buf);
-	return ret;
-}
-
-static void free_cpu_topo(struct cpu_topo *tp)
-{
-	u32 i;
-
-	if (!tp)
-		return;
-
-	for (i = 0 ; i < tp->core_sib; i++)
-		zfree(&tp->core_siblings[i]);
-
-	for (i = 0 ; i < tp->thread_sib; i++)
-		zfree(&tp->thread_siblings[i]);
-
-	free(tp);
-}
-
-static struct cpu_topo *build_cpu_topology(void)
-{
-	struct cpu_topo *tp = NULL;
-	void *addr;
-	u32 nr, i;
-	size_t sz;
-	long ncpus;
-	int ret = -1;
-	struct cpu_map *map;
-
-	ncpus = cpu__max_present_cpu();
-
-	/* build online CPU map */
-	map = cpu_map__new(NULL);
-	if (map == NULL) {
-		pr_debug("failed to get system cpumap\n");
-		return NULL;
-	}
-
-	nr = (u32)(ncpus & UINT_MAX);
-
-	sz = nr * sizeof(char *);
-	addr = calloc(1, sizeof(*tp) + 2 * sz);
-	if (!addr)
-		goto out_free;
-
-	tp = addr;
-	addr += sizeof(*tp);
-	tp->core_siblings = addr;
-	addr += sz;
-	tp->thread_siblings = addr;
-
-	for (i = 0; i < nr; i++) {
-		if (!cpu_map__has(map, i))
-			continue;
-
-		ret = build_cpu_topo(tp, i);
-		if (ret < 0)
-			break;
-	}
-
-out_free:
-	cpu_map__put(map);
-	if (ret) {
-		free_cpu_topo(tp);
-		tp = NULL;
-	}
-	return tp;
-}
 
 static int write_cpu_topology(struct feat_fd *ff,
 			      struct perf_evlist *evlist __maybe_unused)
 {
-	struct cpu_topo *tp;
+	struct cpu_topology *tp;
 	u32 i;
 	int ret, j;
 
-	tp = build_cpu_topology();
+	tp = cpu_topology__new();
 	if (!tp)
 		return -1;
 
@@ -746,7 +604,7 @@ static int write_cpu_topology(struct feat_fd *ff,
 			return ret;
 	}
 done:
-	free_cpu_topo(tp);
+	cpu_topology__delete(tp);
 	return ret;
 }
 
-- 
2.17.2

[PATCH 3/4] perf tools: Add numa_topology object

[Jiri Olsa]

Adding numa_topology object to return the list of numa
nodes together with their cpus. It will replace the numa
code in header.c and will be used from perf record code
in following patches.

Adding following interface functions to load numa details:

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

And replacing current (copied) local interface, with no
functional changes.

Link: http://lkml.kernel.org/n/tip-rn15st6hjj7txg2i88v7yff4@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/cputopo.c | 118 +++++++++++++++++++++++++++++++++++++
 tools/perf/util/cputopo.h |  16 +++++
 tools/perf/util/header.c  | 119 +++++++++-----------------------------
 3 files changed, 160 insertions(+), 93 deletions(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 84470ed4e707..83ffca2ea9ee 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -1,9 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <sys/param.h>
+#include <inttypes.h>
 
 #include "cputopo.h"
 #include "cpumap.h"
 #include "util.h"
+#include "env.h"
 
 
 #define CORE_SIB_FMT \
@@ -142,3 +144,119 @@ struct cpu_topology *cpu_topology__new(void)
 	}
 	return tp;
 }
+
+static int load_numa_node(struct numa_topology_node *node, int nr)
+{
+	char str[MAXPATHLEN];
+	char field[32];
+	char *buf = NULL, *p;
+	size_t len = 0;
+	int ret = -1;
+	FILE *fp;
+	u64 mem;
+
+	node->node = (u32) nr;
+
+	sprintf(str, "/sys/devices/system/node/node%d/meminfo", nr);
+	fp = fopen(str, "r");
+	if (!fp)
+		return -1;
+
+	while (getline(&buf, &len, fp) > 0) {
+		/* skip over invalid lines */
+		if (!strchr(buf, ':'))
+			continue;
+		if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
+			goto err;
+		if (!strcmp(field, "MemTotal:"))
+			node->mem_total = mem;
+		if (!strcmp(field, "MemFree:"))
+			node->mem_free = mem;
+		if (node->mem_total && node->mem_free)
+			break;
+	}
+
+	fclose(fp);
+	fp = NULL;
+
+	sprintf(str, "/sys/devices/system/node/node%d/cpulist", nr);
+
+	fp = fopen(str, "r");
+	if (!fp)
+		return -1;
+
+	if (getline(&buf, &len, fp) <= 0)
+		goto err;
+
+	p = strchr(buf, '\n');
+	if (p)
+		*p = '\0';
+
+	node->cpus = buf;
+	fclose(fp);
+	return 0;
+
+err:
+	free(buf);
+	if (fp)
+		fclose(fp);
+	return ret;
+}
+
+struct numa_topology *numa_topology__new(void)
+{
+	struct cpu_map *node_map = NULL;
+	struct numa_topology *tp = NULL;
+	char *buf = NULL;
+	size_t len = 0;
+	u32 nr, i;
+	FILE *fp;
+	char *c;
+
+	fp = fopen("/sys/devices/system/node/online", "r");
+	if (!fp)
+		return NULL;
+
+	if (getline(&buf, &len, fp) <= 0)
+		goto out;
+
+	c = strchr(buf, '\n');
+	if (c)
+		*c = '\0';
+
+	node_map = cpu_map__new(buf);
+	if (!node_map)
+		goto out;
+
+	nr = (u32) node_map->nr;
+
+	tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0])*nr);
+	if (!tp)
+		goto out;
+
+	tp->nr = nr;
+
+	for (i = 0; i < nr; i++) {
+		if (load_numa_node(&tp->nodes[i], node_map->map[i])) {
+			numa_topology__delete(tp);
+			tp = NULL;
+			break;
+		}
+	}
+
+out:
+	free(buf);
+	fclose(fp);
+	cpu_map__put(node_map);
+	return tp;
+}
+
+void numa_topology__delete(struct numa_topology *tp)
+{
+	u32 i;
+
+	for (i = 0; i < tp->nr; i++)
+		free(tp->nodes[i].cpus);
+
+	free(tp);
+}
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
index 4b5f4112b6f8..47a97e71acdf 100644
--- a/tools/perf/util/cputopo.h
+++ b/tools/perf/util/cputopo.h
@@ -3,6 +3,7 @@
 #define __PERF_CPUTOPO_H
 
 #include <linux/types.h>
+#include "env.h"
 
 struct cpu_topology {
 	u32	  core_sib;
@@ -11,7 +12,22 @@ struct cpu_topology {
 	char	**thread_siblings;
 };
 
+struct numa_topology_node {
+	char		*cpus;
+	u32		 node;
+	u64		 mem_total;
+	u64		 mem_free;
+};
+
+struct numa_topology {
+	u32				nr;
+	struct numa_topology_node	nodes[0];
+};
+
 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);
+
 #endif /* __PERF_CPUTOPO_H */
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 80ac57e6d38f..a2323d777dae 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -639,112 +639,45 @@ static int write_total_mem(struct feat_fd *ff,
 	return ret;
 }
 
-static int write_topo_node(struct feat_fd *ff, int node)
-{
-	char str[MAXPATHLEN];
-	char field[32];
-	char *buf = NULL, *p;
-	size_t len = 0;
-	FILE *fp;
-	u64 mem_total, mem_free, mem;
-	int ret = -1;
-
-	sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
-	fp = fopen(str, "r");
-	if (!fp)
-		return -1;
-
-	while (getline(&buf, &len, fp) > 0) {
-		/* skip over invalid lines */
-		if (!strchr(buf, ':'))
-			continue;
-		if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
-			goto done;
-		if (!strcmp(field, "MemTotal:"))
-			mem_total = mem;
-		if (!strcmp(field, "MemFree:"))
-			mem_free = mem;
-	}
-
-	fclose(fp);
-	fp = NULL;
-
-	ret = do_write(ff, &mem_total, sizeof(u64));
-	if (ret)
-		goto done;
-
-	ret = do_write(ff, &mem_free, sizeof(u64));
-	if (ret)
-		goto done;
-
-	ret = -1;
-	sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
-
-	fp = fopen(str, "r");
-	if (!fp)
-		goto done;
-
-	if (getline(&buf, &len, fp) <= 0)
-		goto done;
-
-	p = strchr(buf, '\n');
-	if (p)
-		*p = '\0';
-
-	ret = do_write_string(ff, buf);
-done:
-	free(buf);
-	if (fp)
-		fclose(fp);
-	return ret;
-}
-
 static int write_numa_topology(struct feat_fd *ff,
 			       struct perf_evlist *evlist __maybe_unused)
 {
-	char *buf = NULL;
-	size_t len = 0;
-	FILE *fp;
-	struct cpu_map *node_map = NULL;
-	char *c;
-	u32 nr, i, j;
+	struct numa_topology *tp;
 	int ret = -1;
+	u32 i;
 
-	fp = fopen("/sys/devices/system/node/online", "r");
-	if (!fp)
-		return -1;
+	tp = numa_topology__new();
+	if (!tp)
+		return -ENOMEM;
 
-	if (getline(&buf, &len, fp) <= 0)
-		goto done;
+	ret = do_write(ff, &tp->nr, sizeof(u32));
+	if (ret < 0)
+		goto err;
 
-	c = strchr(buf, '\n');
-	if (c)
-		*c = '\0';
+	for (i = 0; i < tp->nr; i++) {
+		struct numa_topology_node *n = &tp->nodes[i];
 
-	node_map = cpu_map__new(buf);
-	if (!node_map)
-		goto done;
-
-	nr = (u32)node_map->nr;
+		ret = do_write(ff, &n->node, sizeof(u32));
+		if (ret < 0)
+			goto err;
 
-	ret = do_write(ff, &nr, sizeof(nr));
-	if (ret < 0)
-		goto done;
+		ret = do_write(ff, &n->mem_total, sizeof(u64));
+		if (ret)
+			goto err;
 
-	for (i = 0; i < nr; i++) {
-		j = (u32)node_map->map[i];
-		ret = do_write(ff, &j, sizeof(j));
-		if (ret < 0)
-			break;
+		ret = do_write(ff, &n->mem_free, sizeof(u64));
+		if (ret)
+			goto err;
 
-		ret = write_topo_node(ff, j);
+		ret = do_write_string(ff, n->cpus);
 		if (ret < 0)
-			break;
+			goto err;
 	}
-done:
-	free(buf);
-	fclose(fp);
-	cpu_map__put(node_map);
+
+	ret = 0;
+
+err:
+	numa_topology__delete(tp);
 	return ret;
 }
 
-- 
2.17.2

[PATCH 4/4] perf tools: Use sysfs__mountpoint() when reading cpu topology

[Jiri Olsa]

Using sysfs__mountpoint() when reading sysfs files
for cpu/numa topology.

Also using scnprintf instead of sprintf as suggested
by Namhyung.

Link: http://lkml.kernel.org/n/tip-pny10k3m9459q6f2j7ot7uzs@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/cputopo.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 83ffca2ea9ee..ece0710249d4 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <sys/param.h>
 #include <inttypes.h>
+#include <api/fs/fs.h>
 
 #include "cputopo.h"
 #include "cpumap.h"
@@ -9,9 +10,15 @@
 
 
 #define CORE_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
+	"%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
 #define THRD_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+	"%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+#define NODE_ONLINE_FMT \
+	"%s/devices/system/node/online"
+#define NODE_MEMINFO_FMT \
+	"%s/devices/system/node/node%d/meminfo"
+#define NODE_CPULIST_FMT \
+	"%s/devices/system/node/node%d/cpulist"
 
 static int build_cpu_topology(struct cpu_topology *tp, int cpu)
 {
@@ -23,7 +30,8 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
 	u32 i = 0;
 	int ret = -1;
 
-	sprintf(filename, CORE_SIB_FMT, cpu);
+	scnprintf(filename, MAXPATHLEN, CORE_SIB_FMT,
+		  sysfs__mountpoint(), cpu);
 	fp = fopen(filename, "r");
 	if (!fp)
 		goto try_threads;
@@ -50,7 +58,8 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
 	ret = 0;
 
 try_threads:
-	sprintf(filename, THRD_SIB_FMT, cpu);
+	scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,
+		  sysfs__mountpoint(), cpu);
 	fp = fopen(filename, "r");
 	if (!fp)
 		goto done;
@@ -157,7 +166,8 @@ static int load_numa_node(struct numa_topology_node *node, int nr)
 
 	node->node = (u32) nr;
 
-	sprintf(str, "/sys/devices/system/node/node%d/meminfo", nr);
+	scnprintf(str, MAXPATHLEN, NODE_MEMINFO_FMT,
+		  sysfs__mountpoint(), nr);
 	fp = fopen(str, "r");
 	if (!fp)
 		return -1;
@@ -179,7 +189,8 @@ static int load_numa_node(struct numa_topology_node *node, int nr)
 	fclose(fp);
 	fp = NULL;
 
-	sprintf(str, "/sys/devices/system/node/node%d/cpulist", nr);
+	scnprintf(str, MAXPATHLEN, NODE_CPULIST_FMT,
+		  sysfs__mountpoint(), nr);
 
 	fp = fopen(str, "r");
 	if (!fp)
@@ -207,13 +218,17 @@ struct numa_topology *numa_topology__new(void)
 {
 	struct cpu_map *node_map = NULL;
 	struct numa_topology *tp = NULL;
+	char path[MAXPATHLEN];
 	char *buf = NULL;
 	size_t len = 0;
 	u32 nr, i;
 	FILE *fp;
 	char *c;
 
-	fp = fopen("/sys/devices/system/node/online", "r");
+	scnprintf(path, MAXPATHLEN, NODE_ONLINE_FMT,
+		  sysfs__mountpoint());
+
+	fp = fopen(path, "r");
 	if (!fp)
 		return NULL;
 
-- 
2.17.2

Re: [PATCHv3 0/4] perf tools: Assorted fixes

[Namhyung Kim]

Hi Jirka,

On Tue, Feb 19, 2019 at 6:58 PM Jiri Olsa <jolsa@kernel.org> wrote:
>
> hi,
> sending assorted general fixes that queued
> up in my other branches.
>
> v3 changes:
>   - fix for fixes found by Namhyung
>   - new patch to use sysfs__mountpoint
>
> v2 changes:
>   - renamed the interface to struct cpu_topology/numa_topology
>     plus related changes in function names
>   - adding missing Fixes tag
>
> Also available in here:
>   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   perf/fixes
>
> thanks,
> jirka
>
>
> ---
> Jiri Olsa (4):
>       perf header: Fix wrong node write in NUMA_TOPOLOGY feature
>       perf tools: Add cpu_topology object
>       perf tools: Add numa_topology object
>       perf tools: Use sysfs__mountpoint() when reading cpu topology

Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks,
Namhyung


>
>  tools/perf/util/Build     |   1 +
>  tools/perf/util/cputopo.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/cputopo.h |  33 ++++++++++++++++++++++
>  tools/perf/util/header.c  | 269 ++++++++++++++++++++--------------------------------------------------------------------------------------------------------------------------------------------------------
>  4 files changed, 341 insertions(+), 239 deletions(-)
>  create mode 100644 tools/perf/util/cputopo.c
>  create mode 100644 tools/perf/util/cputopo.h

Re: [PATCHv3 0/4] perf tools: Assorted fixes

[Arnaldo Carvalho de Melo]

Em Tue, Feb 19, 2019 at 11:28:31PM +0900, Namhyung Kim escreveu:
> Hi Jirka,
> 
> On Tue, Feb 19, 2019 at 6:58 PM Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > hi,
> > sending assorted general fixes that queued
> > up in my other branches.
> >
> > v3 changes:
> >   - fix for fixes found by Namhyung
> >   - new patch to use sysfs__mountpoint
> >
> > v2 changes:
> >   - renamed the interface to struct cpu_topology/numa_topology
> >     plus related changes in function names
> >   - adding missing Fixes tag
> >
> > Also available in here:
> >   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
> >   perf/fixes
> >
> > thanks,
> > jirka
> >
> >
> > ---
> > Jiri Olsa (4):
> >       perf header: Fix wrong node write in NUMA_TOPOLOGY feature
> >       perf tools: Add cpu_topology object
> >       perf tools: Add numa_topology object
> >       perf tools: Use sysfs__mountpoint() when reading cpu topology
> 
> Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks, added and applied.

- Arnaldo

[tip:perf/core] perf header: Fix wrong node write in NUMA_TOPOLOGY feature

[tip-bot for Jiri Olsa]

Commit-ID:  b00ccb27f97367d89e2d7b419ed198b0985be55d
Gitweb:     https://git.kernel.org/tip/b00ccb27f97367d89e2d7b419ed198b0985be55d
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Tue, 19 Feb 2019 10:58:12 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 19 Feb 2019 12:20:55 -0300

perf header: Fix wrong node write in NUMA_TOPOLOGY feature

We are currently passing the node index instead of the real node number.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: fbe96f29ce4b ("perf tools: Make perf.data more self-descriptive (v8)"
Link: http://lkml.kernel.org/r/20190219095815.15931-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 61ce197c5362..c66f26ec557a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -879,7 +879,7 @@ static int write_numa_topology(struct feat_fd *ff,
 		if (ret < 0)
 			break;
 
-		ret = write_topo_node(ff, i);
+		ret = write_topo_node(ff, j);
 		if (ret < 0)
 			break;
 	}

[tip:perf/core] perf tools: Add cpu_topology object

[tip-bot for Jiri Olsa]

Commit-ID:  5135d5efcbb439c2acb20d6197dd57af3a456e76
Gitweb:     https://git.kernel.org/tip/5135d5efcbb439c2acb20d6197dd57af3a456e76
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Tue, 19 Feb 2019 10:58:13 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 19 Feb 2019 12:21:01 -0300

perf tools: Add cpu_topology object

Make struct cpu_topo global and rename it to 'struct cpu_topology', so
that it can be used from the 'perf record' command in the following
patches.

Add the following interface functions to load/free cpu topology details:

  struct cpu_topology *cpu_topology__new(void);
  void cpu_topology__delete(struct cpu_topology *tp);

Move it to a separate source file cputopo.c together with numa related
object in the following patches.

No functional change, the new interface will be used in upcoming changes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190219095815.15931-3-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/Build     |   1 +
 tools/perf/util/cputopo.c | 144 ++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/cputopo.h |  17 ++++++
 tools/perf/util/header.c  | 150 ++--------------------------------------------
 4 files changed, 166 insertions(+), 146 deletions(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index ca0741c91903..3008d49fa587 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -69,6 +69,7 @@ perf-y += hist.o
 perf-y += util.o
 perf-y += xyarray.o
 perf-y += cpumap.o
+perf-y += cputopo.o
 perf-y += cgroup.o
 perf-y += target.o
 perf-y += rblist.o
diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
new file mode 100644
index 000000000000..84470ed4e707
--- /dev/null
+++ b/tools/perf/util/cputopo.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <sys/param.h>
+
+#include "cputopo.h"
+#include "cpumap.h"
+#include "util.h"
+
+
+#define CORE_SIB_FMT \
+	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
+#define THRD_SIB_FMT \
+	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+
+static int build_cpu_topology(struct cpu_topology *tp, int cpu)
+{
+	FILE *fp;
+	char filename[MAXPATHLEN];
+	char *buf = NULL, *p;
+	size_t len = 0;
+	ssize_t sret;
+	u32 i = 0;
+	int ret = -1;
+
+	sprintf(filename, CORE_SIB_FMT, 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->core_sib; i++) {
+		if (!strcmp(buf, tp->core_siblings[i]))
+			break;
+	}
+	if (i == tp->core_sib) {
+		tp->core_siblings[i] = buf;
+		tp->core_sib++;
+		buf = NULL;
+		len = 0;
+	}
+	ret = 0;
+
+try_threads:
+	sprintf(filename, THRD_SIB_FMT, cpu);
+	fp = fopen(filename, "r");
+	if (!fp)
+		goto done;
+
+	if (getline(&buf, &len, fp) <= 0)
+		goto done;
+
+	p = strchr(buf, '\n');
+	if (p)
+		*p = '\0';
+
+	for (i = 0; i < tp->thread_sib; i++) {
+		if (!strcmp(buf, tp->thread_siblings[i]))
+			break;
+	}
+	if (i == tp->thread_sib) {
+		tp->thread_siblings[i] = buf;
+		tp->thread_sib++;
+		buf = NULL;
+	}
+	ret = 0;
+done:
+	if (fp)
+		fclose(fp);
+	free(buf);
+	return ret;
+}
+
+void cpu_topology__delete(struct cpu_topology *tp)
+{
+	u32 i;
+
+	if (!tp)
+		return;
+
+	for (i = 0 ; i < tp->core_sib; i++)
+		zfree(&tp->core_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 *tp = NULL;
+	void *addr;
+	u32 nr, i;
+	size_t sz;
+	long ncpus;
+	int ret = -1;
+	struct cpu_map *map;
+
+	ncpus = cpu__max_present_cpu();
+
+	/* build online CPU map */
+	map = cpu_map__new(NULL);
+	if (map == NULL) {
+		pr_debug("failed to get system cpumap\n");
+		return NULL;
+	}
+
+	nr = (u32)(ncpus & UINT_MAX);
+
+	sz = nr * sizeof(char *);
+	addr = calloc(1, sizeof(*tp) + 2 * sz);
+	if (!addr)
+		goto out_free;
+
+	tp = addr;
+	addr += sizeof(*tp);
+	tp->core_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);
+		if (ret < 0)
+			break;
+	}
+
+out_free:
+	cpu_map__put(map);
+	if (ret) {
+		cpu_topology__delete(tp);
+		tp = NULL;
+	}
+	return tp;
+}
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
new file mode 100644
index 000000000000..4b5f4112b6f8
--- /dev/null
+++ b/tools/perf/util/cputopo.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_CPUTOPO_H
+#define __PERF_CPUTOPO_H
+
+#include <linux/types.h>
+
+struct cpu_topology {
+	u32	  core_sib;
+	u32	  thread_sib;
+	char	**core_siblings;
+	char	**thread_siblings;
+};
+
+struct cpu_topology *cpu_topology__new(void);
+void cpu_topology__delete(struct cpu_topology *tp);
+
+#endif /* __PERF_CPUTOPO_H */
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c66f26ec557a..80ac57e6d38f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -39,6 +39,7 @@
 #include "tool.h"
 #include "time-utils.h"
 #include "units.h"
+#include "cputopo.h"
 
 #include "sane_ctype.h"
 
@@ -557,158 +558,15 @@ static int write_cmdline(struct feat_fd *ff,
 	return 0;
 }
 
-#define CORE_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
-#define THRD_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
-
-struct cpu_topo {
-	u32 core_sib;
-	u32 thread_sib;
-	char **core_siblings;
-	char **thread_siblings;
-};
-
-static int build_cpu_topo(struct cpu_topo *tp, int cpu)
-{
-	FILE *fp;
-	char filename[MAXPATHLEN];
-	char *buf = NULL, *p;
-	size_t len = 0;
-	ssize_t sret;
-	u32 i = 0;
-	int ret = -1;
-
-	sprintf(filename, CORE_SIB_FMT, 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->core_sib; i++) {
-		if (!strcmp(buf, tp->core_siblings[i]))
-			break;
-	}
-	if (i == tp->core_sib) {
-		tp->core_siblings[i] = buf;
-		tp->core_sib++;
-		buf = NULL;
-		len = 0;
-	}
-	ret = 0;
-
-try_threads:
-	sprintf(filename, THRD_SIB_FMT, cpu);
-	fp = fopen(filename, "r");
-	if (!fp)
-		goto done;
-
-	if (getline(&buf, &len, fp) <= 0)
-		goto done;
-
-	p = strchr(buf, '\n');
-	if (p)
-		*p = '\0';
-
-	for (i = 0; i < tp->thread_sib; i++) {
-		if (!strcmp(buf, tp->thread_siblings[i]))
-			break;
-	}
-	if (i == tp->thread_sib) {
-		tp->thread_siblings[i] = buf;
-		tp->thread_sib++;
-		buf = NULL;
-	}
-	ret = 0;
-done:
-	if(fp)
-		fclose(fp);
-	free(buf);
-	return ret;
-}
-
-static void free_cpu_topo(struct cpu_topo *tp)
-{
-	u32 i;
-
-	if (!tp)
-		return;
-
-	for (i = 0 ; i < tp->core_sib; i++)
-		zfree(&tp->core_siblings[i]);
-
-	for (i = 0 ; i < tp->thread_sib; i++)
-		zfree(&tp->thread_siblings[i]);
-
-	free(tp);
-}
-
-static struct cpu_topo *build_cpu_topology(void)
-{
-	struct cpu_topo *tp = NULL;
-	void *addr;
-	u32 nr, i;
-	size_t sz;
-	long ncpus;
-	int ret = -1;
-	struct cpu_map *map;
-
-	ncpus = cpu__max_present_cpu();
-
-	/* build online CPU map */
-	map = cpu_map__new(NULL);
-	if (map == NULL) {
-		pr_debug("failed to get system cpumap\n");
-		return NULL;
-	}
-
-	nr = (u32)(ncpus & UINT_MAX);
-
-	sz = nr * sizeof(char *);
-	addr = calloc(1, sizeof(*tp) + 2 * sz);
-	if (!addr)
-		goto out_free;
-
-	tp = addr;
-	addr += sizeof(*tp);
-	tp->core_siblings = addr;
-	addr += sz;
-	tp->thread_siblings = addr;
-
-	for (i = 0; i < nr; i++) {
-		if (!cpu_map__has(map, i))
-			continue;
-
-		ret = build_cpu_topo(tp, i);
-		if (ret < 0)
-			break;
-	}
-
-out_free:
-	cpu_map__put(map);
-	if (ret) {
-		free_cpu_topo(tp);
-		tp = NULL;
-	}
-	return tp;
-}
 
 static int write_cpu_topology(struct feat_fd *ff,
 			      struct perf_evlist *evlist __maybe_unused)
 {
-	struct cpu_topo *tp;
+	struct cpu_topology *tp;
 	u32 i;
 	int ret, j;
 
-	tp = build_cpu_topology();
+	tp = cpu_topology__new();
 	if (!tp)
 		return -1;
 
@@ -746,7 +604,7 @@ static int write_cpu_topology(struct feat_fd *ff,
 			return ret;
 	}
 done:
-	free_cpu_topo(tp);
+	cpu_topology__delete(tp);
 	return ret;
 }
 

[tip:perf/core] perf tools: Add numa_topology object

[tip-bot for Jiri Olsa]

Commit-ID:  48e6c5acd36873ff022cd97de866bfd0a36a3b99
Gitweb:     https://git.kernel.org/tip/48e6c5acd36873ff022cd97de866bfd0a36a3b99
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Tue, 19 Feb 2019 10:58:14 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 19 Feb 2019 12:21:06 -0300

perf tools: Add numa_topology object

Add the numa_topology object to return the list of numa nodes together
with their cpus. It will replace the numa code in header.c and will be
used from 'perf record' in the following patches.

Add the following interface functions to load numa details:

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

And replace the current (copied) local interface, with no functional
changes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190219095815.15931-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/cputopo.c | 118 +++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/cputopo.h |  16 +++++++
 tools/perf/util/header.c  | 119 ++++++++++------------------------------------
 3 files changed, 160 insertions(+), 93 deletions(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 84470ed4e707..83ffca2ea9ee 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -1,9 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <sys/param.h>
+#include <inttypes.h>
 
 #include "cputopo.h"
 #include "cpumap.h"
 #include "util.h"
+#include "env.h"
 
 
 #define CORE_SIB_FMT \
@@ -142,3 +144,119 @@ out_free:
 	}
 	return tp;
 }
+
+static int load_numa_node(struct numa_topology_node *node, int nr)
+{
+	char str[MAXPATHLEN];
+	char field[32];
+	char *buf = NULL, *p;
+	size_t len = 0;
+	int ret = -1;
+	FILE *fp;
+	u64 mem;
+
+	node->node = (u32) nr;
+
+	sprintf(str, "/sys/devices/system/node/node%d/meminfo", nr);
+	fp = fopen(str, "r");
+	if (!fp)
+		return -1;
+
+	while (getline(&buf, &len, fp) > 0) {
+		/* skip over invalid lines */
+		if (!strchr(buf, ':'))
+			continue;
+		if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
+			goto err;
+		if (!strcmp(field, "MemTotal:"))
+			node->mem_total = mem;
+		if (!strcmp(field, "MemFree:"))
+			node->mem_free = mem;
+		if (node->mem_total && node->mem_free)
+			break;
+	}
+
+	fclose(fp);
+	fp = NULL;
+
+	sprintf(str, "/sys/devices/system/node/node%d/cpulist", nr);
+
+	fp = fopen(str, "r");
+	if (!fp)
+		return -1;
+
+	if (getline(&buf, &len, fp) <= 0)
+		goto err;
+
+	p = strchr(buf, '\n');
+	if (p)
+		*p = '\0';
+
+	node->cpus = buf;
+	fclose(fp);
+	return 0;
+
+err:
+	free(buf);
+	if (fp)
+		fclose(fp);
+	return ret;
+}
+
+struct numa_topology *numa_topology__new(void)
+{
+	struct cpu_map *node_map = NULL;
+	struct numa_topology *tp = NULL;
+	char *buf = NULL;
+	size_t len = 0;
+	u32 nr, i;
+	FILE *fp;
+	char *c;
+
+	fp = fopen("/sys/devices/system/node/online", "r");
+	if (!fp)
+		return NULL;
+
+	if (getline(&buf, &len, fp) <= 0)
+		goto out;
+
+	c = strchr(buf, '\n');
+	if (c)
+		*c = '\0';
+
+	node_map = cpu_map__new(buf);
+	if (!node_map)
+		goto out;
+
+	nr = (u32) node_map->nr;
+
+	tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0])*nr);
+	if (!tp)
+		goto out;
+
+	tp->nr = nr;
+
+	for (i = 0; i < nr; i++) {
+		if (load_numa_node(&tp->nodes[i], node_map->map[i])) {
+			numa_topology__delete(tp);
+			tp = NULL;
+			break;
+		}
+	}
+
+out:
+	free(buf);
+	fclose(fp);
+	cpu_map__put(node_map);
+	return tp;
+}
+
+void numa_topology__delete(struct numa_topology *tp)
+{
+	u32 i;
+
+	for (i = 0; i < tp->nr; i++)
+		free(tp->nodes[i].cpus);
+
+	free(tp);
+}
diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
index 4b5f4112b6f8..47a97e71acdf 100644
--- a/tools/perf/util/cputopo.h
+++ b/tools/perf/util/cputopo.h
@@ -3,6 +3,7 @@
 #define __PERF_CPUTOPO_H
 
 #include <linux/types.h>
+#include "env.h"
 
 struct cpu_topology {
 	u32	  core_sib;
@@ -11,7 +12,22 @@ struct cpu_topology {
 	char	**thread_siblings;
 };
 
+struct numa_topology_node {
+	char		*cpus;
+	u32		 node;
+	u64		 mem_total;
+	u64		 mem_free;
+};
+
+struct numa_topology {
+	u32				nr;
+	struct numa_topology_node	nodes[0];
+};
+
 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);
+
 #endif /* __PERF_CPUTOPO_H */
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 80ac57e6d38f..a2323d777dae 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -639,112 +639,45 @@ static int write_total_mem(struct feat_fd *ff,
 	return ret;
 }
 
-static int write_topo_node(struct feat_fd *ff, int node)
-{
-	char str[MAXPATHLEN];
-	char field[32];
-	char *buf = NULL, *p;
-	size_t len = 0;
-	FILE *fp;
-	u64 mem_total, mem_free, mem;
-	int ret = -1;
-
-	sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
-	fp = fopen(str, "r");
-	if (!fp)
-		return -1;
-
-	while (getline(&buf, &len, fp) > 0) {
-		/* skip over invalid lines */
-		if (!strchr(buf, ':'))
-			continue;
-		if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
-			goto done;
-		if (!strcmp(field, "MemTotal:"))
-			mem_total = mem;
-		if (!strcmp(field, "MemFree:"))
-			mem_free = mem;
-	}
-
-	fclose(fp);
-	fp = NULL;
-
-	ret = do_write(ff, &mem_total, sizeof(u64));
-	if (ret)
-		goto done;
-
-	ret = do_write(ff, &mem_free, sizeof(u64));
-	if (ret)
-		goto done;
-
-	ret = -1;
-	sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
-
-	fp = fopen(str, "r");
-	if (!fp)
-		goto done;
-
-	if (getline(&buf, &len, fp) <= 0)
-		goto done;
-
-	p = strchr(buf, '\n');
-	if (p)
-		*p = '\0';
-
-	ret = do_write_string(ff, buf);
-done:
-	free(buf);
-	if (fp)
-		fclose(fp);
-	return ret;
-}
-
 static int write_numa_topology(struct feat_fd *ff,
 			       struct perf_evlist *evlist __maybe_unused)
 {
-	char *buf = NULL;
-	size_t len = 0;
-	FILE *fp;
-	struct cpu_map *node_map = NULL;
-	char *c;
-	u32 nr, i, j;
+	struct numa_topology *tp;
 	int ret = -1;
+	u32 i;
 
-	fp = fopen("/sys/devices/system/node/online", "r");
-	if (!fp)
-		return -1;
+	tp = numa_topology__new();
+	if (!tp)
+		return -ENOMEM;
 
-	if (getline(&buf, &len, fp) <= 0)
-		goto done;
+	ret = do_write(ff, &tp->nr, sizeof(u32));
+	if (ret < 0)
+		goto err;
 
-	c = strchr(buf, '\n');
-	if (c)
-		*c = '\0';
+	for (i = 0; i < tp->nr; i++) {
+		struct numa_topology_node *n = &tp->nodes[i];
 
-	node_map = cpu_map__new(buf);
-	if (!node_map)
-		goto done;
-
-	nr = (u32)node_map->nr;
+		ret = do_write(ff, &n->node, sizeof(u32));
+		if (ret < 0)
+			goto err;
 
-	ret = do_write(ff, &nr, sizeof(nr));
-	if (ret < 0)
-		goto done;
+		ret = do_write(ff, &n->mem_total, sizeof(u64));
+		if (ret)
+			goto err;
 
-	for (i = 0; i < nr; i++) {
-		j = (u32)node_map->map[i];
-		ret = do_write(ff, &j, sizeof(j));
-		if (ret < 0)
-			break;
+		ret = do_write(ff, &n->mem_free, sizeof(u64));
+		if (ret)
+			goto err;
 
-		ret = write_topo_node(ff, j);
+		ret = do_write_string(ff, n->cpus);
 		if (ret < 0)
-			break;
+			goto err;
 	}
-done:
-	free(buf);
-	fclose(fp);
-	cpu_map__put(node_map);
+
+	ret = 0;
+
+err:
+	numa_topology__delete(tp);
 	return ret;
 }
 

[tip:perf/core] perf tools: Use sysfs__mountpoint() when reading cpu topology

[tip-bot for Jiri Olsa]

Commit-ID:  e19a01c1438e123d169fd09376a221d844797174
Gitweb:     https://git.kernel.org/tip/e19a01c1438e123d169fd09376a221d844797174
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Tue, 19 Feb 2019 10:58:15 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 19 Feb 2019 12:21:10 -0300

perf tools: Use sysfs__mountpoint() when reading cpu topology

Use sysfs__mountpoint() when reading sysfs files to obtain cpu/numa
topologies.

Also use scnprintf instead of sprintf as suggested by Namhyung.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190219095815.15931-5-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/cputopo.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 83ffca2ea9ee..ece0710249d4 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <sys/param.h>
 #include <inttypes.h>
+#include <api/fs/fs.h>
 
 #include "cputopo.h"
 #include "cpumap.h"
@@ -9,9 +10,15 @@
 
 
 #define CORE_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
+	"%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
 #define THRD_SIB_FMT \
-	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+	"%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+#define NODE_ONLINE_FMT \
+	"%s/devices/system/node/online"
+#define NODE_MEMINFO_FMT \
+	"%s/devices/system/node/node%d/meminfo"
+#define NODE_CPULIST_FMT \
+	"%s/devices/system/node/node%d/cpulist"
 
 static int build_cpu_topology(struct cpu_topology *tp, int cpu)
 {
@@ -23,7 +30,8 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
 	u32 i = 0;
 	int ret = -1;
 
-	sprintf(filename, CORE_SIB_FMT, cpu);
+	scnprintf(filename, MAXPATHLEN, CORE_SIB_FMT,
+		  sysfs__mountpoint(), cpu);
 	fp = fopen(filename, "r");
 	if (!fp)
 		goto try_threads;
@@ -50,7 +58,8 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
 	ret = 0;
 
 try_threads:
-	sprintf(filename, THRD_SIB_FMT, cpu);
+	scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,
+		  sysfs__mountpoint(), cpu);
 	fp = fopen(filename, "r");
 	if (!fp)
 		goto done;
@@ -157,7 +166,8 @@ static int load_numa_node(struct numa_topology_node *node, int nr)
 
 	node->node = (u32) nr;
 
-	sprintf(str, "/sys/devices/system/node/node%d/meminfo", nr);
+	scnprintf(str, MAXPATHLEN, NODE_MEMINFO_FMT,
+		  sysfs__mountpoint(), nr);
 	fp = fopen(str, "r");
 	if (!fp)
 		return -1;
@@ -179,7 +189,8 @@ static int load_numa_node(struct numa_topology_node *node, int nr)
 	fclose(fp);
 	fp = NULL;
 
-	sprintf(str, "/sys/devices/system/node/node%d/cpulist", nr);
+	scnprintf(str, MAXPATHLEN, NODE_CPULIST_FMT,
+		  sysfs__mountpoint(), nr);
 
 	fp = fopen(str, "r");
 	if (!fp)
@@ -207,13 +218,17 @@ struct numa_topology *numa_topology__new(void)
 {
 	struct cpu_map *node_map = NULL;
 	struct numa_topology *tp = NULL;
+	char path[MAXPATHLEN];
 	char *buf = NULL;
 	size_t len = 0;
 	u32 nr, i;
 	FILE *fp;
 	char *c;
 
-	fp = fopen("/sys/devices/system/node/online", "r");
+	scnprintf(path, MAXPATHLEN, NODE_ONLINE_FMT,
+		  sysfs__mountpoint());
+
+	fp = fopen(path, "r");
 	if (!fp)
 		return NULL;