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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 v3 16/25] trace-cmd library: Use sections database when reading parts of the trace file
Date: Tue, 14 Sep 2021 16:14:29 +0300	[thread overview]
Message-ID: <20210914131438.3965484-17-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20210914131438.3965484-1-tz.stoyanov@gmail.com>

Utilize the internal database with file sections, when reading parts
of a trace file. This logic unifies the way trace file version 6 and 7
are processed.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 lib/trace-cmd/trace-input.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index bc3bc5d2..785a1b93 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -3283,21 +3283,26 @@ int tracecmd_make_pipe(struct tracecmd_input *handle, int cpu, int fd, int cpus)
  */
 void tracecmd_print_events(struct tracecmd_input *handle, const char *regex)
 {
-	int ret;
+	struct file_section *sec;
 
 	if (!regex)
 		regex = ".*";
 
-	if (!handle->ftrace_files_start) {
-		lseek64(handle->fd, handle->header_files_start, SEEK_SET);
+	sec = section_open(handle, TRACECMD_OPTION_HEADER_INFO);
+	if (sec) {
 		read_header_files(handle);
+		section_close(handle, sec);
+	}
+	sec = section_open(handle, TRACECMD_OPTION_FTRACE_EVENTS);
+	if (sec) {
+		read_ftrace_files(handle, regex);
+		section_close(handle, sec);
+	}
+	sec = section_open(handle, TRACECMD_OPTION_EVENT_FORMATS);
+	if (sec) {
+		read_event_files(handle, regex);
+		section_close(handle, sec);
 	}
-	ret = read_ftrace_files(handle, regex);
-	if (ret < 0)
-		return;
-
-	read_event_files(handle, regex);
-	return;
 }
 
 /* Show the cpu data stats */
@@ -3901,6 +3906,7 @@ int tracecmd_copy_headers(struct tracecmd_input *handle, int fd,
 			  enum tracecmd_file_states start_state,
 			  enum tracecmd_file_states end_state)
 {
+	struct file_section *sec;
 	int ret;
 
 	if (!start_state)
@@ -3916,13 +3922,17 @@ int tracecmd_copy_headers(struct tracecmd_input *handle, int fd,
 
 	if (handle->file_state >= start_state) {
 		/* Set the handle to just before the start state */
-		lseek64(handle->fd, handle->header_files_start, SEEK_SET);
+		sec = section_open(handle, TRACECMD_OPTION_HEADER_INFO);
+		if (!sec)
+			return -1;
 		/* Now that the file handle has moved, change its state */
 		handle->file_state = TRACECMD_FILE_INIT;
 	}
 
 	/* Try to bring the input up to the start state - 1 */
 	ret = tracecmd_read_headers(handle, start_state - 1);
+	if (sec)
+		section_close(handle, sec);
 	if (ret < 0)
 		goto out;
 
-- 
2.31.1


  parent reply	other threads:[~2021-09-14 13:15 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-14 13:14 [PATCH v3 00/25] Trace file version 7 - sections Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 01/25] trace-cmd library: Define trace file version 7 Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 02/25] trace-cmd library: Add cache functionality to network message handler Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 03/25] trace-cmd library: New APIs to get and set version of output handler Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 04/25] trace-cmd library: Add internal helper function for writing headers before file sections Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 05/25] trace-cmd library: Write header " Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 06/25] trace-cmd library: Add multiple options sections in trace file version 7 Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 07/25] trace-cmd library: Do not write CPU count section in trace files " Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 08/25] trace-cmd library: Move CPU flyrecord trace metadata into the buffer option, for trace file " Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 09/25] trace-cmd record: Append trace options after the trace data are written Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 10/25] trace-cmd library: Add section header before flyrecord trace data Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 11/25] trace-cmd library: Fit CPU latency trace data in the new trace file version 7 format Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 12/25] trace-cmd library: Do not write CPUs with empty trace data Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 13/25] trace-cmd library: Add macro to check file state on reading Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 14/25] trace-cmd library: Introduce sections in trace file reading logic Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 15/25] trace-cmd library: Initialize internal sections database on file read Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` Tzvetomir Stoyanov (VMware) [this message]
2021-09-14 13:14 ` [PATCH v3 17/25] trace-cmd library: Read headers from trace file version 7 Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 18/25] trace-cmd library: Read extended BUFFER option Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 19/25] trace-cmd library: Handle the extended DONE option Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 20/25] trace-cmd library: Initialize CPU data for reading from version 7 trace files Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 21/25] trace-cmd library: Handle latency trace in version 7 files Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 22/25] trace-cmd library: Handle buffer trace data init for " Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 23/25] trace-cmd report: Use the new latency API to read data Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 24/25] trace-cmd: Call additional APIs when creating trace file Tzvetomir Stoyanov (VMware)
2021-09-14 13:14 ` [PATCH v3 25/25] trace-cmd report: Add new parameter for trace file version Tzvetomir Stoyanov (VMware)

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