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Subject[PATCH 28/53] perf tools: Move timestamp creation to util
Date
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>
Signed-off-by: He Kuang <hekuang@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
tools/perf/builtin-buildid-cache.c | 14 +-------------
tools/perf/util/util.c | 17 +++++++++++++++++
tools/perf/util/util.h | 1 +
3 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index d93bff7..632efc6 100644
--- 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 88b8f8d..5b8259b 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -690,3 +690,20 @@ out:

return tip;
}
+
+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 fe915e6..ef97038 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -343,5 +343,6 @@ int fetch_kernel_version(unsigned int *puint,
#define KVER_PARAM(x) KVER_VERSION(x), KVER_PATCHLEVEL(x), KVER_SUBLEVEL(x)

const char *perf_tip(const char *dirpath);
+int fetch_current_timestamp(char *buf, size_t sz);

#endif /* GIT_COMPAT_UTIL_H */
--
1.8.3.4
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