X-Git-Url: http://git.liburcu.org/?p=lttng-modules.git;a=blobdiff_plain;f=lttng-context-ppid.c;h=33ea1a796e0503d203b64cbd74db7420cb3fb534;hp=a22c9d83ccd2671133db528ea8b02b64ef242620;hb=f127e61ee231d002fb9a7803643a157e06f6d2e2;hpb=07dfc1d0e4b093ad02682499a702dc11e54e8302

diff --git a/lttng-context-ppid.c b/lttng-context-ppid.c
index a22c9d83..33ea1a79 100644
--- a/lttng-context-ppid.c
+++ b/lttng-context-ppid.c
@@ -46,7 +46,6 @@ void ppid_record(struct lttng_ctx_field *field,
 {
 	pid_t ppid;
 
-
 	/*
 	 * TODO: when we eventually add RCU subsystem instrumentation,
 	 * taking the rcu read lock here will trigger RCU tracing
@@ -54,7 +53,6 @@ void ppid_record(struct lttng_ctx_field *field,
 	 * it synchronizes both for RCU and RCU sched, and rely on
 	 * rcu_read_lock_sched_notrace.
 	 */
-
 	rcu_read_lock();
 	ppid = task_tgid_nr(current->real_parent);
 	rcu_read_unlock();
@@ -62,6 +60,25 @@ void ppid_record(struct lttng_ctx_field *field,
 	chan->ops->event_write(ctx, &ppid, sizeof(ppid));
 }
 
+static
+void ppid_get_value(struct lttng_ctx_field *field,
+		union lttng_ctx_value *value)
+{
+	pid_t ppid;
+
+	/*
+	 * TODO: when we eventually add RCU subsystem instrumentation,
+	 * taking the rcu read lock here will trigger RCU tracing
+	 * recursively. We should modify the kernel synchronization so
+	 * it synchronizes both for RCU and RCU sched, and rely on
+	 * rcu_read_lock_sched_notrace.
+	 */
+	rcu_read_lock();
+	ppid = task_tgid_nr(current->real_parent);
+	rcu_read_unlock();
+	value->s64 = ppid;
+}
+
 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx)
 {
 	struct lttng_ctx_field *field;
@@ -83,6 +100,7 @@ int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx)
 	field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
 	field->get_size = ppid_get_size;
 	field->record = ppid_record;
+	field->get_value = ppid_get_value;
 	lttng_context_update(*ctx);
 	wrapper_vmalloc_sync_all();
 	return 0;