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From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH v17 14/18] trace-cmd: Add host trace clock as guest trace argument
Date: Tue,  3 Dec 2019 12:35:18 +0200
Message-ID: <20191203103522.482684-15-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20191203103522.482684-1-tz.stoyanov@gmail.com>

When tracing host and guest machines, both should use the same
tracing clock for event timestamps. If a clock is specified
as host tracing argument, with option "-C clock_name", the same
is injected as guest tracing argument. If the user wants to use
different tracing clocks, it can specify it using "-C clock_name"
as guest tracing argument. In that case, the one specified by
the user has higher priority.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 tracecmd/trace-record.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 49730d6..e7fb1bd 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -5405,6 +5405,8 @@ static void parse_record_options(int argc,
 	char *sav;
 	int name_counter = 0;
 	int neg_event = 0;
+	struct buffer_instance *instance;
+	bool guest_config = false;
 
 	init_common_record_context(ctx, curr_cmd);
 
@@ -5562,6 +5564,7 @@ static void parse_record_options(int argc,
 			break;
 		case 'C':
 			ctx->instance->ftrace->clock = optarg;
+			guest_config = true;
 			break;
 		case 'v':
 			neg_event = 1;
@@ -5779,14 +5782,26 @@ static void parse_record_options(int argc,
 
 	/* If --date is specified, prepend it to all guest VM flags */
 	if (ctx->date) {
-		struct buffer_instance *instance;
-
 		for_all_instances(instance) {
 			if (is_guest(instance))
 				add_argv(instance, "--date", true);
 		}
 	}
 
+	if (guest_config) {
+		/* If -C is specified, prepend clock to all guest VM flags */
+		for_all_instances(instance) {
+			if (top_instance.ftrace->clock) {
+				if (is_guest(instance)) {
+					add_argv(instance,
+						 (char *)top_instance.ftrace->clock,
+						 true);
+					add_argv(instance, "-C", true);
+				}
+			}
+		}
+	}
+
 	if (!ctx->filtered && ctx->instance->filter_mod)
 		add_func(&ctx->instance->filter_funcs,
 			 ctx->instance->filter_mod, "*");
-- 
2.23.0


  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 10:35 [PATCH v17 00/18]Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 01/18] trace-cmd: Implement new lib API: tracecmd_local_events_system() Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 02/18] trace-cmd: Add support for negative time offsets in trace.dat file Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 03/18] trace-cmd: Add implementations of htonll() and ntohll() Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 04/18] trace-cmd: Add new library APIs for ftrace instances Tzvetomir Stoyanov (VMware)
2019-12-04 16:17   ` Steven Rostedt
2019-12-05 14:40     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 05/18] trace-cmd: Add new library API for local CPU count Tzvetomir Stoyanov (VMware)
2019-12-04 20:09   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 06/18] trace-cmd: Add new library API for reading ftrace buffers Tzvetomir Stoyanov (VMware)
2019-12-04 21:10   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 07/18] trace-cmd: Find and store pids of tasks, which run virtual CPUs of given VM Tzvetomir Stoyanov (VMware)
2019-12-04 21:35   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 08/18] trace-cmd: Implement new API tracecmd_add_option_v() Tzvetomir Stoyanov (VMware)
2019-12-04 21:47   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 09/18] trace-cmd: Add new API to generate a unique ID of the tracing session Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 10/18] trace-cmd: Store the session tracing ID in the trace.dat file Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 11/18] trace-cmd: Exchange tracing IDs between host and guest Tzvetomir Stoyanov (VMware)
2019-12-04 22:03   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 12/18] trace-cmd: Implement new option in trace.dat file: TRACECMD_OPTION_TIME_SHIFT Tzvetomir Stoyanov (VMware)
2019-12-05  0:46   ` Steven Rostedt
2019-12-05 15:09     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 13/18] trace-cmd: Add guest information in host's trace.dat file Tzvetomir Stoyanov (VMware)
2019-12-05  0:59   ` Steven Rostedt
2019-12-03 10:35 ` Tzvetomir Stoyanov (VMware) [this message]
2019-12-09 19:31   ` [PATCH v17 14/18] trace-cmd: Add host trace clock as guest trace argument Steven Rostedt
2019-12-10  8:49     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 15/18] trace-cmd: Refactor few trace-cmd internal functions Tzvetomir Stoyanov (VMware)
2019-12-09 19:32   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 16/18] trace-cmd: Basic infrastructure for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 17/18] trace-cmd: [POC] PTP-like algorithm " Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 18/18] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)

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