perf tools: Move timestamp creation to util

Timestamp generation becomes a public available helper. Which will
be used by 'perf record', help it output to split output file based
on time.

For example:

 perf.data.2015122620363710
 perf.data.2015122620364092
 perf.data.2015122620365423
 ...

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1453715801-7732-27-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index d93bff7fc0e407d6518a6ce0e2ee0dd4b65bf910..632efc6b79a07e20c4b25f9757bcd9c089050270 100644 (file)
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -38,19 +38,7 @@ static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
 
 static int build_id_cache__kcore_dir(char *dir, size_t sz)
 {
-       struct timeval tv;
-       struct tm tm;
-       char dt[32];
-
-       if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
-               return -1;
-
-       if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
-               return -1;
-
-       scnprintf(dir, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
-
-       return 0;
+       return fetch_current_timestamp(dir, sz);
 }
 
 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 7a2da7ef556eddfef426678c91406f0c3f8bb5a8..b9e2843cfbe77b83a43f165d37491ebc74782781 100644 (file)
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -701,3 +701,20 @@ bool is_regular_file(const char *file)
 
        return S_ISREG(st.st_mode);
 }
+
+int fetch_current_timestamp(char *buf, size_t sz)
+{
+       struct timeval tv;
+       struct tm tm;
+       char dt[32];
+
+       if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
+               return -1;
+
+       if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
+               return -1;
+
+       scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
+
+       return 0;
+}

diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 61650f05e5c19b919d68d904334489dd83739c90..a8615816a00da5b277ea1ab50a7fbaafc3a5ffaa 100644 (file)
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -344,5 +344,6 @@ int fetch_kernel_version(unsigned int *puint,
 
 const char *perf_tip(const char *dirpath);
 bool is_regular_file(const char *file);
+int fetch_current_timestamp(char *buf, size_t sz);
 
 #endif /* GIT_COMPAT_UTIL_H */