diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-01-12 17:03:24 -0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-01-22 19:56:29 -0200 |
| commit | 70082dd92c4b288bd723a77897e2b555f0e63113 (patch) | |
| tree | 907a2d78fcaabc28cd4d034901e0eac800d1ed17 /tools/perf/perf.h | |
| parent | dd7927f4f8ee75b032ff15aeef4bda49719a443a (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.h | 14 |
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. |