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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>
This commit is contained in:
Jiri Olsa 2019-02-19 10:58:15 +01:00 committed by Arnaldo Carvalho de Melo
parent 48e6c5acd3
commit e19a01c143
1 changed files with 22 additions and 7 deletions
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29
tools/perf/util/cputopo.c
View File

@ -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;