X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=lttng-context-ppid.c;h=8b7c8ed7604c02166f3cd200506a40811a9e5f3a;hb=7299e758b109db074589f7879ae631b27c25dc05;hp=9cb3133996eada56a49ef2b24b088ad063f4ee02;hpb=13ab8b0a749053960f81a4924a3ed27775518f94;p=lttng-modules.git

diff --git a/lttng-context-ppid.c b/lttng-context-ppid.c
index 9cb31339..8b7c8ed7 100644
--- a/lttng-context-ppid.c
+++ b/lttng-context-ppid.c
@@ -24,10 +24,10 @@
 #include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/syscalls.h>
-#include "lttng-events.h"
-#include "wrapper/ringbuffer/frontend_types.h"
-#include "wrapper/vmalloc.h"
-#include "lttng-tracer.h"
+#include <lttng-events.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <lttng-tracer.h>
 
 static
 size_t ppid_get_size(size_t offset)
@@ -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 +60,26 @@ 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,
+		struct lttng_probe_ctx *lttng_probe_ctx,
+		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;
@@ -83,15 +101,9 @@ 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;
 }
 EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit PPID Context");
-MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
-	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
-	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
-	LTTNG_MODULES_EXTRAVERSION);