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>
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index cb05f39..cd9f920 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -20,7 +20,9 @@
#include "util/data.h"
#include <sys/prctl.h>
+#ifdef HAVE_TIMERFD_SUPPORT
#include <sys/timerfd.h>
+#endif
#include <termios.h>
#include <semaphore.h>
@@ -337,6 +339,7 @@
INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
}
+#ifdef HAVE_TIMERFD_SUPPORT
static void clear_events_cache_stats(struct list_head *kvm_events_cache)
{
struct list_head *head;
@@ -358,6 +361,7 @@
}
}
}
+#endif
static int kvm_events_hash_fn(u64 key)
{
@@ -783,6 +787,7 @@
pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
}
+#ifdef HAVE_TIMERFD_SUPPORT
static int process_lost_event(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct perf_sample *sample __maybe_unused,
@@ -793,6 +798,7 @@
kvm->lost_events++;
return 0;
}
+#endif
static bool skip_sample(struct perf_kvm_stat *kvm,
struct perf_sample *sample)
@@ -872,6 +878,7 @@
return true;
}
+#ifdef HAVE_TIMERFD_SUPPORT
/* keeping the max events to a modest level to keep
* the processing of samples per mmap smooth.
*/
@@ -1213,6 +1220,7 @@
out:
return rc;
}
+#endif
static int read_events(struct perf_kvm_stat *kvm)
{
@@ -1379,6 +1387,7 @@
return kvm_events_report_vcpu(kvm);
}
+#ifdef HAVE_TIMERFD_SUPPORT
static struct perf_evlist *kvm_live_event_list(void)
{
struct perf_evlist *evlist;
@@ -1566,6 +1575,7 @@
return err;
}
+#endif
static void print_kvm_stat_usage(void)
{
@@ -1604,8 +1614,10 @@
if (!strncmp(argv[1], "rep", 3))
return kvm_events_report(&kvm, argc - 1 , argv + 1);
+#ifdef HAVE_TIMERFD_SUPPORT
if (!strncmp(argv[1], "live", 4))
return kvm_events_live(&kvm, argc - 1 , argv + 1);
+#endif
perf_stat:
return cmd_stat(argc, argv, NULL);