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authorArnaldo Carvalho de Melo <acme@redhat.com>2011-01-12 17:11:53 -0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-01-22 19:56:29 -0200
commit115d2d8963a426670ac3ce983fc4c4e001703943 (patch)
treec37115abbf95a7c68b0a99b1cf60e0ee0e48b7ea /tools/perf/perf.h
parent744bd8aa3c8b43447f689a27872fa95e700b8a4f (diff)
perf record: Move perf_mmap__write_tail to perf.h
Close to perf_mmap__read_head() and the perf_mmap struct definition. This is useful for any recorder, and we will need it in 'perf test'. 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.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 5fb5e1f11d1c..a5fc660c1f12 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -108,6 +108,18 @@ static inline unsigned int perf_mmap__read_head(struct perf_mmap *mm)
return head;
}
+static inline void perf_mmap__write_tail(struct perf_mmap *md,
+ unsigned long tail)
+{
+ struct perf_event_mmap_page *pc = md->base;
+
+ /*
+ * ensure all reads are done before we write the tail out.
+ */
+ /* mb(); */
+ pc->data_tail = tail;
+}
+
/*
* prctl(PR_TASK_PERF_EVENTS_DISABLE) will (cheaply) disable all
* counters in the current task.