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Subject[PATCH 03/22] perf tools: Add debug_set_display_time function
Date
Allow to display time in perf debug output via new
debug_set_display_time function.

It will be used in perf daemon command to get verbose
output into log file.

The debug time format is:

[2020-12-03 18:25:31.822152] affinity: SYS
[2020-12-03 18:25:31.822164] mmap flush: 1
[2020-12-03 18:25:31.822175] comp level: 0
[2020-12-03 18:25:32.002047] mmap size 528384B

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/debug.c | 34 +++++++++++++++++++++++++++++++---
tools/perf/util/debug.h | 1 +
2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 50fd6a4be4e0..dc148b08814b 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -10,6 +10,7 @@
#include <api/debug.h>
#include <linux/kernel.h>
#include <linux/time64.h>
+#include <sys/time.h>
#ifdef HAVE_BACKTRACE_SUPPORT
#include <execinfo.h>
#endif
@@ -31,21 +32,48 @@ int debug_ordered_events;
static int redirect_to_stderr;
int debug_data_convert;
static FILE *debug_file;
+bool debug_display_time;

void debug_set_file(FILE *file)
{
debug_file = file;
}

+void debug_set_display_time(bool set)
+{
+ debug_display_time = set;
+}
+
+static int fprintf_time(FILE *file)
+{
+ struct timeval tod;
+ struct tm ltime;
+ char date[64];
+
+ if (!debug_display_time)
+ return 0;
+
+ if (gettimeofday(&tod, NULL) != 0)
+ return 0;
+
+ if (localtime_r(&tod.tv_sec, &ltime) == NULL)
+ return 0;
+
+ strftime(date, sizeof(date), "%F %H:%M:%S", &ltime);
+ return fprintf(file, "[%s.%06lu] ", date, tod.tv_usec);
+}
+
int veprintf(int level, int var, const char *fmt, va_list args)
{
int ret = 0;

if (var >= level) {
- if (use_browser >= 1 && !redirect_to_stderr)
+ if (use_browser >= 1 && !redirect_to_stderr) {
ui_helpline__vshow(fmt, args);
- else
- ret = vfprintf(debug_file, fmt, args);
+ } else {
+ ret = fprintf_time(debug_file);
+ ret += vfprintf(debug_file, fmt, args);
+ }
}

return ret;
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index 43f712295645..48f631966067 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -64,6 +64,7 @@ int veprintf(int level, int var, const char *fmt, va_list args);

int perf_debug_option(const char *str);
void debug_set_file(FILE *file);
+void debug_set_display_time(bool set);
void perf_debug_setup(void);
int perf_quiet_option(void);

--
2.26.2
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