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authorArnaldo Carvalho de Melo <acme@redhat.com>2011-01-12 17:03:24 -0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-01-22 19:56:29 -0200
commit70082dd92c4b288bd723a77897e2b555f0e63113 (patch)
tree907a2d78fcaabc28cd4d034901e0eac800d1ed17 /tools/perf/perf.h
parentdd7927f4f8ee75b032ff15aeef4bda49719a443a (diff)
perf evsel: Introduce mmap support
Out of the code in 'perf top'. Record is next in line. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/perf.h')
-rw-r--r--tools/perf/perf.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 95aaf565c70..5fb5e1f11d1 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -94,6 +94,20 @@ void get_term_dimensions(struct winsize *ws);
#include "util/types.h"
#include <stdbool.h>
+struct perf_mmap {
+ void *base;
+ int mask;
+ unsigned int prev;
+};
+
+static inline unsigned int perf_mmap__read_head(struct perf_mmap *mm)
+{
+ struct perf_event_mmap_page *pc = mm->base;
+ int head = pc->data_head;
+ rmb();
+ return head;
+}
+
/*
* prctl(PR_TASK_PERF_EVENTS_DISABLE) will (cheaply) disable all
* counters in the current task.