trace-cmd: Add split -C <cpu> to strip out a single cpu from file

The -C option for trace-cmd split was always partially implemented, but never fully. That is, you could pass in -C 1, but it did nothing and was ignored. Now add that feature to actualy work. Signed-off-by: Steven Rostedt <[email protected]>
apolyudov · Apr 22, 2014 · 52de056 · 52de056
1 parent d205dec
commit 52de056
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diff --git a/Documentation/trace-cmd-split.1.txt b/Documentation/trace-cmd-split.1.txt
@@ -78,6 +78,13 @@ OPTIONS
 
     This will create a file that has 10 pages per each CPU from the input.
 
+*-C* 'cpu'::
+    This option will split for a single CPU. Only the cpu named will be extracted
+    from the file.
+
+    trace-cmd split -C 1
+
+    This will split out all the events for cpu 1 in the file.
 
 SEE ALSO
 --------

diff --git a/trace-split.c b/trace-split.c
@@ -338,7 +338,7 @@ static int parse_cpu(struct tracecmd_input *handle,
 static double parse_file(struct tracecmd_input *handle,
 			 const char *output_file,
 			 unsigned long long start,
-			 unsigned long long end, int percpu,
+			 unsigned long long end, int percpu, int only_cpu,
 			 int count, enum split_types type)
 {
 	unsigned long long current;
@@ -375,7 +375,10 @@ static double parse_file(struct tracecmd_input *handle,
 			tracecmd_set_cpu_to_timestamp(handle, cpu, start);
 	}
 
-	if (percpu) {
+	if (only_cpu >= 0) {
+		parse_cpu(handle, cpu_data, start, end, count,
+			  1, only_cpu, type);
+	} else if (percpu) {
 		for (cpu = 0; cpu < cpus; cpu++)
 			parse_cpu(handle, cpu_data, start,
 				  end, count, percpu, cpu, type);
@@ -534,7 +537,7 @@ void trace_split (int argc, char **argv)
 			strcpy(output_file, output);
 
 		current = parse_file(handle, output_file, start_ns, end_ns,
-				     percpu, count, type);
+				     percpu, cpu, count, type);
 		if (!repeat)
 			break;
 		start_ns = 0;