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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 v4 05/23] trace-cmd: Add new local function to check if a trace clock is supported
Date: Thu, 25 Mar 2021 08:40:37 +0200
Message-ID: <20210325064055.539554-6-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20210325064055.539554-1-tz.stoyanov@gmail.com>

A new local function is added to check if a given trace clock is
supported by the ftrace:
 clock_is_supported()
This function is used by the other patches from the set.
The logic should be part of the tracefs library, when a tracefs API is
implemeneted, this local funciton will be removed.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 tracecmd/trace-record.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 635897e1..c7197ba0 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -5683,6 +5683,34 @@ check_instance_die(struct buffer_instance *instance, char *param)
 		    tracefs_instance_get_name(instance->tracefs), param);
 }
 
+static bool clock_is_supported(struct tracefs_instance *instance, const char *clock)
+{
+	char *all_clocks = NULL;
+	char *ret = NULL;
+
+	all_clocks  = tracefs_instance_file_read(instance, "trace_clock", NULL);
+	if (!all_clocks)
+		return false;
+
+	ret = strstr(all_clocks, clock);
+	if (ret && (ret == all_clocks || ret[-1] == ' ' || ret[-1] == '[')) {
+		switch (ret[strlen(clock)]) {
+		case ' ':
+		case '\0':
+		case ']':
+		case '\n':
+			break;
+		default:
+			ret = NULL;
+		}
+	} else {
+		ret = NULL;
+	}
+	free(all_clocks);
+
+	return ret != NULL;
+}
+
 static void parse_record_options(int argc,
 				 char **argv,
 				 enum trace_cmd curr_cmd,
-- 
2.30.2


  parent reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-25  6:40 [PATCH v4 00/23] TSC trace clock to nanosecond conversion Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 01/23] trace-cmd: Add initial perf interface in trace-cmd library Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 02/23] trace-cmd: Extend trace-cmd dump subcommand to display the clock Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 03/23] trace-cmd: Save only the selected clock in the trace.dat file Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 04/23] trace-cmd: Internal refactoring, move logic for local tep handler in its own function Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` Tzvetomir Stoyanov (VMware) [this message]
2021-03-26 21:21   ` [PATCH v4 05/23] trace-cmd: Add new local function to check if a trace clock is supported Steven Rostedt
2021-03-25  6:40 ` [PATCH v4 06/23] trace-cmd: Add new trace-cmd clock tsc2nsec Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 07/23] trace-cmd: Define a new option for tsc2nsec conversion Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 08/23] trace-cmd: Save information for tsc to nanoseconds conversion in trace file Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 09/23] trace-cmd: Read information for tsc to nanoseconds conversion from " Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 10/23] trace-cmd: Save tsc2nsec clock in trace.dat file Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 11/23] trace-cmd: Append new options into guest trace file at the end of the tracing session Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 12/23] trace-cmd: Remove unneeded multiply in events timestamp reading Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 13/23] trace-cmd: Perform all timestamp corrections in a single function Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 14/23] trace-cmd: Convert tsc timestamps to nanosecods when reading trace data from a file Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 15/23] trace-cmd: Set order and priorities when applying timestamp corrections Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 16/23] trace-cmd: Add a new flag to disable any " Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 17/23] trace-cmd: Change "--nodate" option to affect "--date" option only Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 18/23] trace-cmd: Add new parameter "--raw-ts" to "trace-cmd report" command Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 19/23] trace-cmd: Print times in TimeShift options as unsigned in trace-cmd dump Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 20/23] trace-cmd: Use tsc clock for host-guest tracing, if available Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 21/23] trace-cmd: Get current clock for host-guest tracing session Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 22/23] trace-cmd: Save the trace clocks in TRACECLOCK option Tzvetomir Stoyanov (VMware)
2021-03-25  6:40 ` [PATCH v4 23/23] trace-cmd: Read at least 8 bytes trace-id option Tzvetomir Stoyanov (VMware)
2021-03-26 21:18   ` Steven Rostedt

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