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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2014-08-12 23:04:11 -03:00
parent 521e8bac67
commit 1ddec7f0d0
2 changed files with 23 additions and 0 deletions
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21
tools/perf/util/evlist.c
View File

@ -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)

2
tools/perf/util/evlist.h
View File

@ -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);