aboutsummaryrefslogtreecommitdiff
path: root/trace
diff options
context:
space:
mode:
authorLluís Vilanova <vilanova@ac.upc.edu>2016-09-19 14:55:07 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2016-09-28 19:17:55 +0100
commit2bfe11c8fac96db4f94abbe818fbc964a6744130 (patch)
tree2d095bb5096637d055082bf85286b5da33d268ef /trace
parent331f5eb28a6b537558ac595879d2179885df9db5 (diff)
downloadqemu-arm-2bfe11c8fac96db4f94abbe818fbc964a6744130.tar.gz
trace: Properly initialize dynamic event states in hot-plugged vCPUs
Every time a vCPU is hot-plugged, it will "inherit" its tracing state from the global state array. That is, if *any* existing vCPU has an event enabled, new vCPUs will have too. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-id: 147428970768.15111.7664565956870423529.stgit@fimbulvetr.bsc.es Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'trace')
-rw-r--r--trace/control-target.c37
-rw-r--r--trace/control.c19
-rw-r--r--trace/control.h19
3 files changed, 45 insertions, 30 deletions
diff --git a/trace/control-target.c b/trace/control-target.c
index 72081e2a34..3b7d99b44c 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -81,3 +81,40 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
}
}
}
+
+static bool adding_first_cpu(void)
+{
+ CPUState *cpu;
+ size_t count = 0;
+ CPU_FOREACH(cpu) {
+ count++;
+ if (count > 1) {
+ return false;
+ }
+ }
+ return true;
+}
+
+void trace_init_vcpu(CPUState *vcpu)
+{
+ TraceEvent *ev = NULL;
+
+ while ((ev = trace_event_pattern("*", ev)) != NULL) {
+ if (trace_event_is_vcpu(ev) &&
+ trace_event_get_state_static(ev) &&
+ trace_event_get_state_dynamic(ev)) {
+ TraceEventID id = trace_event_get_id(ev);
+ if (adding_first_cpu()) {
+ /* check preconditions */
+ assert(trace_events_dstate[id] == 1);
+ /* disable early-init state ... */
+ trace_events_dstate[id] = 0;
+ trace_events_enabled_count--;
+ /* ... and properly re-enable */
+ trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
+ } else {
+ trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
+ }
+ }
+ }
+}
diff --git a/trace/control.c b/trace/control.c
index 05d85accbd..10b3e9baba 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -269,22 +269,3 @@ char *trace_opt_parse(const char *optarg)
return trace_file;
}
-
-void trace_init_vcpu_events(void)
-{
- TraceEvent *ev = NULL;
- while ((ev = trace_event_pattern("*", ev)) != NULL) {
- if (trace_event_is_vcpu(ev) &&
- trace_event_get_state_static(ev) &&
- trace_event_get_state_dynamic(ev)) {
- TraceEventID id = trace_event_get_id(ev);
- /* check preconditions */
- assert(trace_events_dstate[id] == 1);
- /* disable early-init state ... */
- trace_events_dstate[id] = 0;
- trace_events_enabled_count--;
- /* ... and properly re-enable */
- trace_event_set_state_dynamic(ev, true);
- }
- }
-}
diff --git a/trace/control.h b/trace/control.h
index 27a16fc955..a22d11242e 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -239,6 +239,14 @@ bool trace_init_backends(void);
void trace_init_file(const char *file);
/**
+ * trace_init_vcpu:
+ * @vcpu: Added vCPU.
+ *
+ * Set initial dynamic event state for a hot-plugged vCPU.
+ */
+void trace_init_vcpu(CPUState *vcpu);
+
+/**
* trace_list_events:
*
* List all available events.
@@ -269,17 +277,6 @@ extern QemuOptsList qemu_trace_opts;
*/
char *trace_opt_parse(const char *optarg);
-/**
- * trace_init_vcpu_events:
- *
- * Re-synchronize initial event state with vCPUs (which can be created after
- * trace_init_events()).
- *
- * Precondition: event states won't be changed between trace_enable_events() and
- * trace_init_vcpu_events() (e.g., through QMP).
- */
-void trace_init_vcpu_events(void);
-
#include "trace/control-internal.h"