To import defer_callchain changes.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/include/uapi/linux/perf_event.h | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index 4842c36fdf801996..a7f875eb29dd049a 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -460,7 +460,8 @@ struct perf_event_attr {
 				inherit_thread :  1, /* children only inherit if cloned with CLONE_THREAD */
 				remove_on_exec :  1, /* event is removed from task on exec */
 				sigtrap        :  1, /* send synchronous SIGTRAP on event */
-				__reserved_1   : 26;
+				defer_callchain:  1, /* generate PERF_RECORD_CALLCHAIN_DEFERRED records */
+				__reserved_1   : 25;
 
 	union {
 		__u32		wakeup_events;	  /* wakeup every n events */
@@ -1217,6 +1218,23 @@ enum perf_event_type {
 	 */
 	PERF_RECORD_AUX_OUTPUT_HW_ID		= 21,
 
+	/*
+	 * This user callchain capture was deferred until shortly before
+	 * returning to user space.  Previous samples would have kernel
+	 * callchains only and they need to be stitched with this to make full
+	 * callchains.
+	 *
+	 * TODO: do PERF_SAMPLE_{REGS,STACK}_USER also need deferral?
+	 *
+	 * struct {
+	 *	struct perf_event_header	header;
+	 *	u64				nr;
+	 *	u64				ips[nr];
+	 *	struct sample_id		sample_id;
+	 * };
+	 */
+	PERF_RECORD_CALLCHAIN_DEFERRED		= 22,
+
 	PERF_RECORD_MAX,			/* non-ABI */
 };
 
@@ -1247,6 +1265,7 @@ enum perf_callchain_context {
 	PERF_CONTEXT_HV			= (__u64)-32,
 	PERF_CONTEXT_KERNEL		= (__u64)-128,
 	PERF_CONTEXT_USER		= (__u64)-512,
+	PERF_CONTEXT_USER_DEFERRED	= (__u64)-640,
 
 	PERF_CONTEXT_GUEST		= (__u64)-2048,
 	PERF_CONTEXT_GUEST_KERNEL	= (__u64)-2176,
-- 
2.46.0.792.g87dc391469-goog