Revert "perf record: Intercept all events"

This reverts commit f5a2c3dc.

This patch is required for making "perf lock rec" work.
The commit f5a2c3dc changes write_event() of builtin-record.c
. And changed write_event() sometimes doesn't stop with perf
lock rec.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
[ that commit also causes perf record to not be Ctrl-C-able,
  and it's concetually wrong to parse the data at record time
  (unconditionally - even when not needed), as we eventually
  want to be able to do zero-copy recording, at least for
  non-archive recordings.  ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/builtin-record.c

@@ -113,25 +113,17 @@ static void write_output(void *buf, size_t size)
 
 static void write_event(event_t *buf, size_t size)
 {
-	size_t processed_size = buf->header.size;
-	event_t *ev = buf;
-
-	do {
 	/*
 	* Add it to the list of DSOs, so that when we finish this
 	 * record session we can pick the available build-ids.
 	 */
-		if (ev->header.type == PERF_RECORD_MMAP) {
+	if (buf->header.type == PERF_RECORD_MMAP) {
 		struct list_head *head = &dsos__user;
-			if (ev->header.misc == 1)
+		if (buf->mmap.header.misc == 1)
 			head = &dsos__kernel;
-			__dsos__findnew(head, ev->mmap.filename);
+		__dsos__findnew(head, buf->mmap.filename);
 	}
 
-		ev = ((void *)ev) + ev->header.size;
-		processed_size += ev->header.size;
-	} while (processed_size < size);
-
 	write_output(buf, size);
 }