From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH v20 11/15] trace-cmd: Add host trace clock as guest trace argument
Date: Thu, 27 Feb 2020 16:19:57 +0200 [thread overview]
Message-ID: <20200227142001.61577-12-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20200227142001.61577-1-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/include/trace-local.h | 1 +
tracecmd/trace-record.c | 21 +++++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h
index 4f2b5541..dc934f28 100644
--- a/tracecmd/include/trace-local.h
+++ b/tracecmd/include/trace-local.h
@@ -167,6 +167,7 @@ enum buffer_instance_flags {
BUFFER_FL_PROFILE = 1 << 1,
BUFFER_FL_GUEST = 1 << 2,
BUFFER_FL_AGENT = 1 << 3,
+ BUFFER_FL_HAS_CLOCK = 1 << 4,
};
struct func_list {
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 5f799908..ee27cf0f 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -5555,6 +5555,8 @@ static void parse_record_options(int argc,
char *sav;
int name_counter = 0;
int neg_event = 0;
+ struct buffer_instance *instance;
+ bool guest_sync_set = false;
init_common_record_context(ctx, curr_cmd);
@@ -5598,6 +5600,8 @@ static void parse_record_options(int argc,
*/
if (c != 'B' && c != 'A' && is_guest(ctx->instance)) {
add_arg(ctx->instance, c, opts, long_options, optarg);
+ if (c == 'C')
+ ctx->instance->flags |= BUFFER_FL_HAS_CLOCK;
continue;
}
@@ -5712,6 +5716,9 @@ static void parse_record_options(int argc,
break;
case 'C':
ctx->instance->clock = optarg;
+ ctx->instance->flags |= BUFFER_FL_HAS_CLOCK;
+ if (is_top_instance(ctx->instance))
+ guest_sync_set = true;
break;
case 'v':
neg_event = 1;
@@ -5936,6 +5943,20 @@ static void parse_record_options(int argc,
add_argv(instance, "--date", true);
}
}
+ if (guest_sync_set) {
+ /* If -C is specified, prepend clock to all guest VM flags */
+ for_all_instances(instance) {
+ if (top_instance.clock) {
+ if (is_guest(instance) &&
+ !(instance->flags & BUFFER_FL_HAS_CLOCK)) {
+ add_argv(instance,
+ (char *)top_instance.clock,
+ true);
+ add_argv(instance, "-C", true);
+ }
+ }
+ }
+ }
if (!ctx->filtered && ctx->instance->filter_mod)
add_func(&ctx->instance->filter_funcs,
--
2.24.1
next prev parent reply other threads:[~2020-02-27 14:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-27 14:19 [PATCH v20 00/15]Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 01/15] trace-cmd: Add support for negative time offsets in trace.dat file Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 02/15] trace-cmd: Add new library API for local CPU count Tzvetomir Stoyanov (VMware)
2020-02-28 23:42 ` Steven Rostedt
2020-02-27 14:19 ` [PATCH v20 03/15] trace-cmd: Find and store pids of tasks, which run virtual CPUs of given VM Tzvetomir Stoyanov (VMware)
2020-02-27 17:23 ` Steven Rostedt
2020-03-02 9:29 ` Tzvetomir Stoyanov
2020-02-27 14:19 ` [PATCH v20 04/15] trace-cmd: Implement new API tracecmd_add_option_v() Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 05/15] trace-cmd: Add new API to generate a unique ID of the tracing session Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 06/15] trace-cmd: Store the session tracing ID in the trace.dat file Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 07/15] trace-cmd: Add definitions of htonll() and ntohll() Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 08/15] trace-cmd: Exchange tracing IDs between host and guest Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 09/15] trace-cmd: Implement new option in trace.dat file: TRACECMD_OPTION_TIME_SHIFT Tzvetomir Stoyanov (VMware)
2020-02-27 17:28 ` Steven Rostedt
2020-02-27 14:19 ` [PATCH v20 10/15] trace-cmd: Add guest information in host's trace.dat file Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` Tzvetomir Stoyanov (VMware) [this message]
2020-02-27 14:19 ` [PATCH v20 12/15] trace-cmd: Refactor few trace-cmd internal functions Tzvetomir Stoyanov (VMware)
2020-02-27 14:19 ` [PATCH v20 13/15] trace-cmd: Basic infrastructure for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2020-02-28 17:41 ` Steven Rostedt
2020-02-29 0:28 ` Steven Rostedt
2020-03-02 9:43 ` Tzvetomir Stoyanov
2020-03-02 13:43 ` Steven Rostedt
2020-02-27 14:20 ` [PATCH v20 14/15] trace-cmd: [POC] PTP-like algorithm " Tzvetomir Stoyanov (VMware)
2020-02-27 14:20 ` [PATCH v20 15/15] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)
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