diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-01-12 17:11:53 -0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-01-22 19:56:29 -0200 |
| commit | 115d2d8963a426670ac3ce983fc4c4e001703943 (patch) | |
| tree | c37115abbf95a7c68b0a99b1cf60e0ee0e48b7ea /tools/perf/perf.h | |
| parent | 744bd8aa3c8b43447f689a27872fa95e700b8a4f (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.h | 12 |
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. |