diff mbox series

[v31,11/16] trace-cmd: Add a new option in trace file metadata for tsc2nsec conversion

Message ID 20210311084857.1919805-12-tz.stoyanov@gmail.com (mailing list archive)
State Superseded
Headers show
Series Timestamp synchronization of host - guest tracing session | expand

Commit Message

Tzvetomir Stoyanov (VMware) March 11, 2021, 8:48 a.m. UTC 
A new option is added in the trace.dat file for holding the multiplier
and shift, used for converting TSC trace clock to nanoseconds.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 .../include/private/trace-cmd-private.h        |  1 +
 tracecmd/trace-dump.c                          | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/lib/trace-cmd/include/private/trace-cmd-private.h b/lib/trace-cmd/include/private/trace-cmd-private.h
index 0f682c18..49e0bb42 100644
--- a/lib/trace-cmd/include/private/trace-cmd-private.h
+++ b/lib/trace-cmd/include/private/trace-cmd-private.h
@@ -125,6 +125,7 @@  enum {
 	TRACECMD_OPTION_TRACEID,
 	TRACECMD_OPTION_TIME_SHIFT,
 	TRACECMD_OPTION_GUEST,
+	TRACECMD_OPTION_TSC2NSEC,
 };
 
 enum {
diff --git a/tracecmd/trace-dump.c b/tracecmd/trace-dump.c
index c1143eba..31b13af4 100644
--- a/tracecmd/trace-dump.c
+++ b/tracecmd/trace-dump.c
@@ -487,6 +487,21 @@  out:
 	free(buf);
 }
 
+void dump_option_tsc2nsec(int fd, int size)
+{
+	int mult, shift, offset;
+
+	do_print(OPTIONS, "\n\t\t[Option TSC2NSEC, %d bytes]\n", size);
+
+	if (read_file_number(fd, &mult, 4))
+		die("cannot read tsc2nsec multiplier");
+	if (read_file_number(fd, &shift, 4))
+		die("cannot read tsc2nsec shift");
+	if (read_file_number(fd, &offset, 4))
+		die("cannot read tsc2nsec offset");
+	do_print(OPTIONS, "%d %d %d [multiplier, shift, offset]\n", mult, shift, offset);
+}
+
 static void dump_options(int fd)
 {
 	unsigned short option;
@@ -546,6 +561,9 @@  static void dump_options(int fd)
 		case TRACECMD_OPTION_GUEST:
 			dump_option_guest(fd, size);
 			break;
+		case TRACECMD_OPTION_TSC2NSEC:
+			dump_option_tsc2nsec(fd, size);
+			break;
 		default:
 			do_print(OPTIONS, " %d %d\t[Unknown option, size - skipping]\n",
 				 option, size);