From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH v31 11/16] trace-cmd: Add a new option in trace file metadata for tsc2nsec conversion
Date: Thu, 11 Mar 2021 10:48:52 +0200 [thread overview]
Message-ID: <20210311084857.1919805-12-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20210311084857.1919805-1-tz.stoyanov@gmail.com>
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 --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);
--
2.29.2
next prev parent reply other threads:[~2021-03-11 8:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 8:48 [PATCH v31 00/16] Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 01/16] trace-cmd: Add timestamp synchronization per vCPU Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 02/16] trace-cmd: Add dummy function to initialize timestamp sync logic Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 03/16] trace-cmd: Move time sync logic in the trace-cmd library Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 04/16] trace-cmd: Wait for first time sync before the trace Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 05/16] trace-cmd: PTP-like algorithm for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 06/16] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 07/16] trace-cmd [POC]: Add KVM timestamp synchronization plugin Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 08/16] trace-cmd: Add initial perf interface in trace-cmd library Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 09/16] trace-cmd: Add logic for TSC to nanosecond conversion Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 10/16] trace-cmd: Append new options into guest trace file at the end of the tracing session Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` Tzvetomir Stoyanov (VMware) [this message]
2021-03-11 8:48 ` [PATCH v31 12/16] trace-cmd: Save information for tsc to nanoseconds conversion in trace file Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 13/16] trace-cmd: Read information for tsc to nanoseconds conversion from " Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 14/16] trace-cmd: Remove unneeded multiply in events timestamp reading Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 15/16] trace-cmd: Perform all timestamp corrections in a single function Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 16/16] trace-cmd: Convert tsc timestamps to nanosecods when reading trace data from a file Tzvetomir Stoyanov (VMware)
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