From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
Save the current buffer_size_kb and subbuf_size_kb files before updating
them, and put them back to what they were when finished with recording.
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
tracecmd/include/trace-local.h | 2 ++
tracecmd/trace-record.c | 24 ++++++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h
index 03738c518aa8..55934f98aa32 100644
--- a/tracecmd/include/trace-local.h
+++ b/tracecmd/include/trace-local.h
@@ -286,7 +286,9 @@ struct buffer_instance {
int tracing_on_init_val;
int tracing_on_fd;
int buffer_size;
+ int old_buffer_size;
int subbuf_size;
+ int old_subbuf_size;
int cpu_count;
int proxy_fd;
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 4646d8eb41f6..762afba4703a 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -2522,6 +2522,26 @@ static void update_reset_triggers(void)
}
}
+static void reset_buffer_files_instance(struct buffer_instance *instance)
+{
+ if (instance->old_buffer_size != instance->buffer_size)
+ tracefs_instance_set_buffer_size(instance->tracefs,
+ instance->old_buffer_size, -1);
+
+ if (instance->old_subbuf_size != instance->subbuf_size)
+ tracefs_instance_set_subbuf_size(instance->tracefs,
+ instance->old_subbuf_size);
+}
+
+static void reset_buffer_files(void)
+{
+ struct buffer_instance *instance;
+
+ for_all_instances(instance) {
+ reset_buffer_files_instance(instance);
+ }
+}
+
static void update_reset_files(void)
{
struct reset_file *reset;
@@ -2536,6 +2556,8 @@ static void update_reset_files(void)
free(reset->reset);
free(reset);
}
+
+ reset_buffer_files();
}
static void
@@ -5110,6 +5132,7 @@ static void set_buffer_size_instance(struct buffer_instance *instance)
if (buffer_size < 0)
die("buffer size must be positive");
+ instance->old_buffer_size = tracefs_instance_get_buffer_size(instance->tracefs, 0);
ret = tracefs_instance_set_buffer_size(instance->tracefs, buffer_size, -1);
if (ret < 0)
warning("Can't set buffer size");
@@ -5129,6 +5152,7 @@ static void set_subbuf_size_instance(struct buffer_instance *instance)
if (subbuf_size < 0)
die("sub-buffer size must be positive");
+ instance->old_subbuf_size = tracefs_instance_get_subbuf_size(instance->tracefs);
ret = tracefs_instance_set_subbuf_size(instance->tracefs, subbuf_size);
if (ret < 0)
warning("Can't set sub-buffer size");
--
2.43.0
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