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authorArnaldo Carvalho de Melo <acme@redhat.com>2014-08-12 23:04:11 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-09-25 16:46:53 -0300
commit1ddec7f0d0ab5b71cf2cc5a782441c20e7afbcfb (patch)
treebaae592cdbb5f1d443136fda8757a9fcd06412e0 /tools/perf
parent521e8bac67a71a6544274f39d5c61473e0e54ac0 (diff)
perf evlist: Introduce perf_evlist__filter_pollfd method
To remove all entries in evlist->pollfd[] that have revents matching at least one of the bits in the specified mask. It'll adjust evlist->nr_fds to the number of unfiltered fds and will return this value, as a convenience and to avoid requiring direct access to internal state of perf_evlist objects. This will be used after polling the evlist fds so that we remove fds that were closed by the kernel. Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-y2sca7z3wicvvy40a50lozwm@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/evlist.c21
-rw-r--r--tools/perf/util/evlist.h2
2 files changed, 23 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a3e28b49128a..023bc3873ae9 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -428,6 +428,27 @@ void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
evlist->nr_fds++;
}
+int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
+{
+ int fd, nr_fds = 0;
+
+ if (evlist->nr_fds == 0)
+ return 0;
+
+ for (fd = 0; fd < evlist->nr_fds; ++fd) {
+ if (evlist->pollfd[fd].revents & revents_and_mask)
+ continue;
+
+ if (fd != nr_fds)
+ evlist->pollfd[nr_fds] = evlist->pollfd[fd];
+
+ ++nr_fds;
+ }
+
+ evlist->nr_fds = nr_fds;
+ return nr_fds;
+}
+
static void perf_evlist__id_hash(struct perf_evlist *evlist,
struct perf_evsel *evsel,
int cpu, int thread, u64 id)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 106de53a6a74..1082420951f9 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -84,6 +84,8 @@ void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd);
+int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask);
+
struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id);