diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-09-08 13:26:35 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-09-25 16:46:55 -0300 |
| commit | 82396986032915c1572bfb74b224fcc2e4e8ba7c (patch) | |
| tree | 14a4781ac1f5892ae12e18c0dd1fe159b1fb4d31 /tools/perf/util/evlist.h | |
| parent | 1b85337d0685d1dc5a6f9061434ba4316d69f3b8 (diff) | |
perf evlist: Refcount mmaps
We need to know how many fds are using a perf mmap via
PERF_EVENT_IOC_SET_OUTPUT, so that we can know when to ditch an mmap,
refcount it.
v2: Automatically unmap it when the refcount hits one, which will happen
when all fds are filtered by perf_evlist__filter_pollfd(), in later
patches.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20140908153824.GG2773@kernel.org
Link: http://lkml.kernel.org/n/tip-cpv7v2lw0g74ucmxa39xdpms@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evlist.h')
| -rw-r--r-- | tools/perf/util/evlist.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index fc013704d90..bd312b01e87 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -18,9 +18,15 @@ struct record_opts; #define PERF_EVLIST__HLIST_BITS 8 #define PERF_EVLIST__HLIST_SIZE (1 << PERF_EVLIST__HLIST_BITS) +/** + * struct perf_mmap - perf's ring buffer mmap details + * + * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this + */ struct perf_mmap { void *base; int mask; + int refcnt; unsigned int prev; char event_copy[PERF_SAMPLE_MAX_SIZE]; }; |