Add BUFFER_FL_GUEST and BUFFER_FL_AGENT flags to differentiate when
trace-record.c is being called to trace guest or the VM tracing agent.
Also disable functions talking to the local tracefs when called in recording
guest instances context.
Signed-off-by: Slavomir Kaslev <kaslevs@xxxxxxxxxx>
---
tracecmd/include/trace-local.h | 5 +++
tracecmd/trace-record.c | 58 ++++++++++++++++++++++++++++++++--
2 files changed, 61 insertions(+), 2 deletions(-)
diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h
index b017a73..5c42877 100644
--- a/tracecmd/include/trace-local.h
+++ b/tracecmd/include/trace-local.h
@@ -148,6 +148,8 @@ char *strstrip(char *str);
enum buffer_instance_flags {
BUFFER_FL_KEEP = 1 << 0,
BUFFER_FL_PROFILE = 1 << 1,
+ BUFFER_FL_GUEST = 1 << 2,
+ BUFFER_FL_AGENT = 1 << 3,
};
struct func_list {
@@ -199,6 +201,9 @@ extern struct buffer_instance *first_instance;
#define for_all_instances(i) for (i = first_instance; i; \
i = i == &top_instance ? buffer_instances : (i)->next)
+#define is_agent(instance) ((instance)->flags & BUFFER_FL_AGENT)
+#define is_guest(instance) ((instance)->flags & BUFFER_FL_GUEST)
+
struct buffer_instance *create_instance(const char *name);
void add_instance(struct buffer_instance *instance, int cpu_count);
char *get_instance_file(struct buffer_instance *instance, const char *file);
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index cf734ac..5d8b4f8 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -822,6 +822,9 @@ static void __clear_trace(struct buffer_instance *instance)
FILE *fp;
char *path;
+ if (is_guest(instance))
+ return;
+
/* reset the trace */
path = get_instance_file(instance, "trace");
fp = fopen(path, "w");
@@ -1339,6 +1342,9 @@ set_plugin_instance(struct buffer_instance *instance, const char *name)
char *path;
char zero = '0';
+ if (is_guest(instance))
+ return;
+
path = get_instance_file(instance, "current_tracer");
fp = fopen(path, "w");
if (!fp) {
@@ -1435,6 +1441,9 @@ static void disable_func_stack_trace_instance(struct buffer_instance *instance)
int size;
int ret;
+ if (is_guest(instance))
+ return;
+
path = get_instance_file(instance, "current_tracer");
ret = stat(path, &st);
tracecmd_put_tracing_file(path);
@@ -1628,6 +1637,9 @@ reset_events_instance(struct buffer_instance *instance)
int i;
int ret;
+ if (is_guest(instance))
+ return;
+
if (use_old_event_method()) {
/* old way only had top instance */
if (!is_top_instance(instance))
@@ -1940,6 +1952,9 @@ static void write_tracing_on(struct buffer_instance *instance, int on)
int ret;
int fd;
+ if (is_guest(instance))
+ return;
+
fd = open_tracing_on(instance);
if (fd < 0)
return;
@@ -1959,6 +1974,9 @@ static int read_tracing_on(struct buffer_instance *instance)
char buf[10];
int ret;
+ if (is_guest(instance))
+ return -1;
+
fd = open_tracing_on(instance);
if (fd < 0)
return fd;
@@ -2105,6 +2123,9 @@ static void update_pid_filters(struct buffer_instance *instance)
int ret;
int fd;
+ if (is_guest(instance))
+ return;
+
fd = open_instance_fd(instance, "set_event_pid",
O_WRONLY | O_CLOEXEC | O_TRUNC);
if (fd < 0)
@@ -2200,6 +2221,9 @@ static void set_mask(struct buffer_instance *instance)
int fd;
int ret;
+ if (is_guest(instance))
+ return;
+
if (!instance->cpumask)
return;
@@ -2230,6 +2254,9 @@ static void enable_events(struct buffer_instance *instance)
{
struct event_list *event;
+ if (is_guest(instance))
+ return;
+
for (event = instance->events; event; event = event->next) {
if (!event->neg)
update_event(event, event->filter, 0, '1');
@@ -2253,6 +2280,9 @@ static void set_clock(struct buffer_instance *instance)
char *content;
char *str;
+ if (is_guest(instance))
+ return;
+
if (!instance->clock)
return;
@@ -2282,6 +2312,9 @@ static void set_max_graph_depth(struct buffer_instance *instance, char *max_grap
char *path;
int ret;
+ if (is_guest(instance))
+ return;
+
path = get_instance_file(instance, "max_graph_depth");
reset_save_file(path, RESET_DEFAULT_PRIO);
tracecmd_put_tracing_file(path);
@@ -2507,6 +2540,9 @@ static void expand_event_instance(struct buffer_instance *instance)
struct event_list *compressed_list = instance->events;
struct event_list *event;
+ if (is_guest(instance))
+ return;
+
reset_event_list(instance);
while (compressed_list) {
@@ -3394,6 +3430,9 @@ static void set_funcs(struct buffer_instance *instance)
int set_notrace = 0;
int ret;
+ if (is_guest(instance))
+ return;
+
ret = write_func_file(instance, "set_ftrace_filter", &instance->filter_funcs);
if (ret < 0)
die("set_ftrace_filter does not exist. Can not filter functions");
@@ -3690,6 +3729,9 @@ static void set_buffer_size_instance(struct buffer_instance *instance)
int ret;
int fd;
+ if (is_guest(instance))
+ return;
+
if (!buffer_size)
return;
@@ -3900,6 +3942,9 @@ static void make_instances(void)
int ret;
for_each_instance(instance) {
+ if (is_guest(instance))
+ continue;
+
path = get_instance_dir(instance);
ret = stat(path, &st);
if (ret < 0) {
@@ -3921,7 +3966,7 @@ void tracecmd_remove_instances(void)
for_each_instance(instance) {
/* Only delete what we created */
- if (instance->flags & BUFFER_FL_KEEP)
+ if (is_guest(instance) || (instance->flags & BUFFER_FL_KEEP))
continue;
if (instance->tracing_on_fd > 0) {
close(instance->tracing_on_fd);
@@ -4003,7 +4048,7 @@ static void check_function_plugin(void)
static int __check_doing_something(struct buffer_instance *instance)
{
- return (instance->flags & BUFFER_FL_PROFILE) ||
+ return is_guest(instance) || (instance->flags & BUFFER_FL_PROFILE) ||
instance->plugin || instance->events;
}
@@ -4025,6 +4070,9 @@ update_plugin_instance(struct buffer_instance *instance,
{
const char *plugin = instance->plugin;
+ if (is_guest(instance))
+ return;
+
if (!plugin)
return;
@@ -4124,6 +4172,9 @@ static void record_stats(void)
int cpu;
for_all_instances(instance) {
+ if (is_guest(instance))
+ continue;
+
s_save = instance->s_save;
s_print = instance->s_print;
for (cpu = 0; cpu < instance->cpu_count; cpu++) {
@@ -4150,6 +4201,9 @@ static void destroy_stats(void)
int cpu;
for_all_instances(instance) {
+ if (is_guest(instance))
+ continue;
+
for (cpu = 0; cpu < instance->cpu_count; cpu++) {
trace_seq_destroy(&instance->s_save[cpu]);
trace_seq_destroy(&instance->s_print[cpu]);
--
2.20.1
|