linux-kernel - [PATCH 5/5] perf kvm stat live: Use fdarray object instead pollfd

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Date:	Wed,  1 Oct 2014 18:00:29 +0200
From:	Jiri Olsa <jolsa@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Milian Wolff <mail@...ianw.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 5/5] perf kvm stat live: Use fdarray object instead pollfd

The reason is that we don't need to count the number of file
descriptors because it's already handled in fdarray object.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Milian Wolff <mail@...ianw.de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-kvm.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index dc7d704735bd..460a4ce9c044 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -896,8 +896,7 @@ static int perf_kvm__handle_stdin(void)
 
 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 {
-	struct pollfd *pollfds = NULL;
-	int nr_fds, nr_stdin, ret, err = -EINVAL;
+	int nr_stdin, ret, err = -EINVAL;
 	struct termios save;
 
 	/* live flag must be set first */
@@ -919,9 +918,6 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 	signal(SIGINT, sig_handler);
 	signal(SIGTERM, sig_handler);
 
-	/* use pollfds -- need to add timerfd and stdin */
-	nr_fds = kvm->evlist->pollfd.nr;
-
 	/* add timer fd */
 	if (perf_kvm__timerfd_create(kvm) < 0) {
 		err = -1;
@@ -931,22 +927,18 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 	if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
 		goto out;
 
-	nr_fds++;
-
 	nr_stdin = perf_evlist__add_pollfd(kvm->evlist, fileno(stdin));
 	if (nr_stdin < 0)
 		goto out;
 
-	nr_fds++;
 	if (fd_set_nonblock(fileno(stdin)) != 0)
 		goto out;
 
-	pollfds	 = kvm->evlist->pollfd.entries;
-
 	/* everything is good - enable the events and process */
 	perf_evlist__enable(kvm->evlist);
 
 	while (!done) {
+		struct fdarray *fda = &kvm->evlist->pollfd;
 		int rc;
 
 		rc = perf_kvm__mmap_read(kvm);
@@ -957,11 +949,11 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 		if (err)
 			goto out;
 
-		if (pollfds[nr_stdin].revents & POLLIN)
+		if (fda->entries[nr_stdin].revents & POLLIN)
 			done = perf_kvm__handle_stdin();
 
 		if (!rc && !done)
-			err = poll(pollfds, nr_fds, 100);
+			err = fdarray__poll(fda, 100);
 	}
 
 	perf_evlist__disable(kvm->evlist);
-- 
1.9.3

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