---

yaml --- r: 323665 b: refs/heads/master c: d077526 h: refs/heads/master i: 323663: 1ca0f4b v: v3
git-mirror · Aug 10, 2012 · 88999d3 · 88999d3
1 parent 1f0474f
commit 88999d3
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Showing 3 changed files with 29 additions and 16 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
+refs/heads/master: d077526485d5c9b12fe85d0b2b3b7041e6bc5f91
diff --git a/trunk/include/linux/perf_event.h b/trunk/include/linux/perf_event.h
@@ -268,7 +268,10 @@ struct perf_event_attr {
 				exclude_host   :  1, /* don't count in host   */
 				exclude_guest  :  1, /* don't count in guest  */
 
-				__reserved_1   : 43;
+				exclude_callchain_kernel : 1, /* exclude kernel callchains */
+				exclude_callchain_user   : 1, /* exclude user callchains */
+
+				__reserved_1   : 41;
 
 	union {
 		__u32		wakeup_events;	  /* wakeup every n events */

diff --git a/trunk/kernel/events/callchain.c b/trunk/kernel/events/callchain.c
@@ -159,6 +159,11 @@ perf_callchain(struct perf_event *event, struct pt_regs *regs)
 	int rctx;
 	struct perf_callchain_entry *entry;
 
+	int kernel = !event->attr.exclude_callchain_kernel;
+	int user   = !event->attr.exclude_callchain_user;
+
+	if (!kernel && !user)
+		return NULL;
 
 	entry = get_callchain_entry(&rctx);
 	if (rctx == -1)
@@ -169,24 +174,29 @@ perf_callchain(struct perf_event *event, struct pt_regs *regs)
 
 	entry->nr = 0;
 
-	if (!user_mode(regs)) {
+	if (kernel && !user_mode(regs)) {
 		perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
 		perf_callchain_kernel(entry, regs);
-		if (current->mm)
-			regs = task_pt_regs(current);
-		else
-			regs = NULL;
 	}
 
-	if (regs) {
-		/*
-		 * Disallow cross-task user callchains.
-		 */
-		if (event->ctx->task && event->ctx->task != current)
-			goto exit_put;
-
-		perf_callchain_store(entry, PERF_CONTEXT_USER);
-		perf_callchain_user(entry, regs);
+	if (user) {
+		if (!user_mode(regs)) {
+			if  (current->mm)
+				regs = task_pt_regs(current);
+			else
+				regs = NULL;
+		}
+
+		if (regs) {
+			/*
+			 * Disallow cross-task user callchains.
+			 */
+			if (event->ctx->task && event->ctx->task != current)
+				goto exit_put;
+
+			perf_callchain_store(entry, PERF_CONTEXT_USER);
+			perf_callchain_user(entry, regs);
+		}
 	}
 
 exit_put: