From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
If a trace.dat file has data in a buffer instance, then task-eval should
be able to read that too. Add a "-B foo" option to task-eval that lets the
user specify a buffer instance that is within a trace.dat file.
This is used for when the trace.dat file is recorded as:
trace-cmd record -B foo ...
The "foo" buffer is stored separately in the trace.dat file and requires
to be retrieved to be seen by libtracecmd.
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
samples/task-eval.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/samples/task-eval.c b/samples/task-eval.c
index ad3e2424acc8..40e7345a27c4 100644
--- a/samples/task-eval.c
+++ b/samples/task-eval.c
@@ -41,6 +41,7 @@ static void usage(void)
" Run this on the resulting trace.dat file\n"
"\n"
"-c comm - to look at only a specific process called 'comm'\n"
+ "-B instance - read a buffer instance in the trace.dat file\n"
"\n",p);
exit(-1);
}
@@ -975,17 +976,21 @@ int main (int argc, char **argv)
{
struct tracecmd_input *handle;
struct task_data data;
+ const char *buffer = NULL;
int c;
memset(&data, 0, sizeof(data));
argv0 = argv[0];
- while ((c = getopt(argc, argv, "c:h")) >= 0) {
+ while ((c = getopt(argc, argv, "c:B:h")) >= 0) {
switch (c) {
case 'c':
data.comm = optarg;
break;
+ case 'B':
+ buffer = optarg;
+ break;
case 'h':
default:
usage();
@@ -1002,6 +1007,24 @@ int main (int argc, char **argv)
if (!handle)
pdie("Error opening %s", argv[0]);
+ if (buffer) {
+ int bufs;
+ int i;
+
+ bufs = tracecmd_buffer_instances(handle);
+ for (i = 0; i < bufs; i++) {
+ const char *name;
+
+ name = tracecmd_buffer_instance_name(handle, i);
+ if (name && strcmp(name, buffer) == 0) {
+ handle = tracecmd_buffer_instance_handle(handle, i);
+ break;
+ }
+ }
+ if (i == bufs)
+ die("Can not find instance %s\n", buffer);
+ }
+
data.teval_tasks = traceeval_init(task_keys, task_vals);
if (!data.teval_tasks)
pdie("Creating trace eval processe data");
--
2.42.0
|