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authorIngo Molnar <mingo@kernel.org>2014-12-12 09:09:52 +0100
committerIngo Molnar <mingo@kernel.org>2014-12-12 09:09:52 +0100
commit41e950c033b7df997d4b38653efe6554be9b96a7 (patch)
treeb8ffe779d47c768a9652ce9166f4878cee41f2ca /tools/lib
parent3459f0d78ffe27a1b341c22eb158b622eaaea3fc (diff)
parente09b18d4907992d3d615b215c1abf585721b2810 (diff)
Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: User visible changes: - Mark events as (x86 only) in help output for 'perf kvm stat live" (Alexander Yarygin) - Provide a better explanation when mmap fails in 'trace' (Arnaldo Carvalho de Melo) - Add --buildid-dir option to set cache directory, i.e. use: $ perf --buildid-dir /path/to/dir tool --tool-options (Jiri Olsa) - Fix memcpy/memset 'perf bench' output (Rabin Vicent) - Fix 'perf test' attr tests size values to cope with machine state on interrupt ABI changes (Jiri Olsa) - Fixup callchain type parameter handling error message (Kan Liang) Infrastructure changes and cleanups: - calloc/xcalloc: Fix argument order (Arjun Sreedharan) - Move filename__read_int from tools/perf/ to tools/lib, add sysctl__read_int there and use it in place of ad-hoc copies (Arnaldo Carvalho de Melo) - Use single strcmp call instead of two (Jiri Olsa) - Remove extra debugdir variables in 'perf buildid-cache' (Jiri Olsa) - Fix -a segfault related to kcore handling in 'perf buildid-cache' (Jiri Olsa) - Move cpumode resolve code to add_callchain_ip (Kan Liang) - Merge memset into memcpy 'perf bench' (Rabin Vincent) - Change print format from %lu to %PRIu64 in the hists browser (Tom Huynh) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/api/fs/fs.c34
-rw-r--r--tools/lib/api/fs/fs.h3
2 files changed, 37 insertions, 0 deletions
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index c1b49c36a951..65d9be3f9887 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -7,6 +7,10 @@
#include <stdlib.h>
#include <string.h>
#include <sys/vfs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
#include "debugfs.h"
#include "fs.h"
@@ -163,3 +167,33 @@ const char *name##__mountpoint(void) \
FS__MOUNTPOINT(sysfs, FS__SYSFS);
FS__MOUNTPOINT(procfs, FS__PROCFS);
+
+int filename__read_int(const char *filename, int *value)
+{
+ char line[64];
+ int fd = open(filename, O_RDONLY), err = -1;
+
+ if (fd < 0)
+ return -1;
+
+ if (read(fd, line, sizeof(line)) > 0) {
+ *value = atoi(line);
+ err = 0;
+ }
+
+ close(fd);
+ return err;
+}
+
+int sysctl__read_int(const char *sysctl, int *value)
+{
+ char path[PATH_MAX];
+ const char *procfs = procfs__mountpoint();
+
+ if (!procfs)
+ return -1;
+
+ snprintf(path, sizeof(path), "%s/sys/%s", procfs, sysctl);
+
+ return filename__read_int(path, value);
+}
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index cb7049551f33..6caa2bbc6cec 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -11,4 +11,7 @@
const char *sysfs__mountpoint(void);
const char *procfs__mountpoint(void);
+
+int filename__read_int(const char *filename, int *value);
+int sysctl__read_int(const char *sysctl, int *value);
#endif /* __API_FS__ */