linux-kernel - [tip:perf/core] perf evlist: Introduce perf_evlist__filter

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Message-ID: <tip-y2sca7z3wicvvy40a50lozwm@git.kernel.org>
Date:	Fri, 26 Sep 2014 02:19:16 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	eranian@...gle.com, acme@...hat.com, mingo@...nel.org,
	jolsa@...nel.org, peterz@...radead.org, efault@....de,
	jolsa@...hat.com, fweisbec@...il.com, dsahern@...il.com,
	tglx@...utronix.de, dzickus@...hat.com, hpa@...or.com,
	paulus@...ba.org, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, adrian.hunter@...el.com
Subject: [tip:perf/core] perf evlist:
  Introduce perf_evlist__filter_pollfd method

Commit-ID:  1ddec7f0d0ab5b71cf2cc5a782441c20e7afbcfb
Gitweb:     http://git.kernel.org/tip/1ddec7f0d0ab5b71cf2cc5a782441c20e7afbcfb
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 12 Aug 2014 23:04:11 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 25 Sep 2014 16:46:53 -0300

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@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-y2sca7z3wicvvy40a50lozwm@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 21 +++++++++++++++++++++
 tools/perf/util/evlist.h |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a3e28b4..023bc38 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 106de53..1082420 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);
--
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