From 87419c9afff1431d4b62b388baf6bfa07e0b14ff Mon Sep 17 00:00:00 2001
From: David Ahern <dsahern@gmail.com>
Date: Tue, 29 Oct 2013 10:43:16 -0600
Subject: perf kvm: Disable live command if timerfd is not supported

If the OS does not have timerfd support (e.g., older OS'es like RHEL5)
disable perf kvm stat live.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1383064996-20933-2-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/config/Makefile                      |  7 +++++++
 tools/perf/config/feature-checks/Makefile       |  6 +++++-
 tools/perf/config/feature-checks/test-all.c     |  5 +++++
 tools/perf/config/feature-checks/test-timerfd.c | 18 ++++++++++++++++++
 4 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 tools/perf/config/feature-checks/test-timerfd.c

(limited to 'tools/perf/config')

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index ffb5f55c8fba..be8bb9a77287 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -397,6 +397,13 @@ else
   endif
 endif
 
+$(call feature_check,timerfd)
+ifeq ($(feature-timerfd), 1)
+  CFLAGS += -DHAVE_TIMERFD_SUPPORT
+else
+  msg := $(warning No timerfd support. Disables 'perf kvm stat live');
+endif
+
 disable-python = $(eval $(disable-python_code))
 define disable-python_code
   CFLAGS += -DNO_LIBPYTHON
diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index d37d58d273fe..c803f17fb986 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -25,7 +25,8 @@ FILES=					\
 	test-libunwind			\
 	test-on-exit			\
 	test-stackprotector-all		\
-	test-stackprotector
+	test-stackprotector		\
+	test-timerfd
 
 CC := $(CC) -MD
 
@@ -136,6 +137,9 @@ test-on-exit:
 test-backtrace:
 	$(BUILD)
 
+test-timerfd:
+	$(BUILD)
+
 -include *.d
 
 ###############################
diff --git a/tools/perf/config/feature-checks/test-all.c b/tools/perf/config/feature-checks/test-all.c
index 50d431892a0c..59e7a705e146 100644
--- a/tools/perf/config/feature-checks/test-all.c
+++ b/tools/perf/config/feature-checks/test-all.c
@@ -81,6 +81,10 @@
 # include "test-libnuma.c"
 #undef main
 
+#define main main_test_timerfd
+# include "test-timerfd.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
 	main_test_libpython();
@@ -101,6 +105,7 @@ int main(int argc, char *argv[])
 	main_test_on_exit();
 	main_test_backtrace();
 	main_test_libnuma();
+	main_test_timerfd();
 
 	return 0;
 }
diff --git a/tools/perf/config/feature-checks/test-timerfd.c b/tools/perf/config/feature-checks/test-timerfd.c
new file mode 100644
index 000000000000..8c5c083b4d3c
--- /dev/null
+++ b/tools/perf/config/feature-checks/test-timerfd.c
@@ -0,0 +1,18 @@
+/*
+ * test for timerfd functions used by perf-kvm-stat-live
+ */
+#include <sys/timerfd.h>
+
+int main(void)
+{
+	struct itimerspec new_value;
+
+	int fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+	if (fd < 0)
+		return 1;
+
+	if (timerfd_settime(fd, 0, &new_value, NULL) != 0)
+		return 1;
+
+	return 0;
+}
-- 
cgit v1.2.3