From: Tzvetomir Stoyanov <tstoyanov@vmware.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH] trace-cmd: improve the accuracy of date to ts mapping
Date: Thu, 20 Dec 2018 17:50:04 +0200 [thread overview]
Message-ID: <20181220155004.5457-1-tstoyanov@vmware.com> (raw)
This patch modifies the get_date_to_ts() function to
achieve more accuracy in date to log's time stamp mappings
Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
---
tracecmd/trace-record.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index e45a1f8..0b58884 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -10,6 +10,7 @@
#include <string.h>
#include <stdarg.h>
#include <getopt.h>
+#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
@@ -96,7 +97,7 @@ static int fset;
static unsigned recorder_flags;
/* Try a few times to get an accurate date */
-static int date2ts_tries = 5;
+static int date2ts_tries = 50;
static struct func_list *graph_funcs;
@@ -3495,8 +3496,8 @@ static char *get_date_to_ts(void)
unsigned long long min_ts;
unsigned long long ts;
struct tep_handle *pevent;
- struct timeval start;
- struct timeval end;
+ struct timespec start;
+ struct timespec end;
char *date2ts = NULL;
char *path;
char *buf;
@@ -3546,20 +3547,20 @@ static char *get_date_to_ts(void)
clear_trace_instances();
tracecmd_enable_tracing();
- gettimeofday(&start, NULL);
+ clock_gettime(CLOCK_REALTIME, &start);
write(tfd, STAMP, 5);
- gettimeofday(&end, NULL);
+ clock_gettime(CLOCK_REALTIME, &end);
tracecmd_disable_tracing();
ts = find_time_stamp(pevent);
if (!ts)
continue;
- diff = (unsigned long long)end.tv_sec * 1000000;
- diff += (unsigned long long)end.tv_usec;
+ diff = (unsigned long long)end.tv_sec * 1000000000LL;
+ diff += (unsigned long long)end.tv_nsec;
stamp = diff;
- diff -= (unsigned long long)start.tv_sec * 1000000;
- diff -= (unsigned long long)start.tv_usec;
+ diff -= (unsigned long long)start.tv_sec * 1000000000LL;
+ diff -= (unsigned long long)start.tv_nsec;
if (diff < min) {
min_ts = ts;
@@ -3584,7 +3585,8 @@ static char *get_date_to_ts(void)
* The difference between the timestamp and the gtod is
* stored as an ASCII string in hex.
*/
- snprintf(date2ts, 19, "0x%llx", min_stamp - min_ts / 1000);
+ diff = min_stamp - min_ts;
+ snprintf(date2ts, 19, "0x%llx", diff/1000);
out_pevent:
tep_free(pevent);
--
2.19.2
reply other threads:[~2018-12-20 15:50 UTC|newest]
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