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| author | Kan Liang <kan.liang@linux.intel.com> | 2020-02-24 22:59:22 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-03-10 18:46:19 +0100 |
| commit | 2a14c1bf017f48a17c8c0ba26a22625363e77cc7 (patch) | |
| tree | 616467e12bc8df3f3196c7b938498b7f459f8c83 /tools/perf/util/util.h | |
| parent | perf metricgroup: Factor out metricgroup__add_metric_weak_group() (diff) | |
| download | linux-2a14c1bf017f48a17c8c0ba26a22625363e77cc7.tar.xz linux-2a14c1bf017f48a17c8c0ba26a22625363e77cc7.zip | |
perf util: Factor out sysctl__nmi_watchdog_enabled()
The NMI watchdog status is required for metric group constraint
examination. Factor out sysctl__nmi_watchdog_enabled() to retrieve the
NMI watchdog status.
Users may count more than one metric group each time. If so, the NMI
watchdog status may be retrieved several times. To reduce the overhead,
cache the NMI watchdog status.
Replace the NMI watchdog status checking in print_footer() by
sysctl__nmi_watchdog_enabled().
Suggested-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: http://lore.kernel.org/lkml/1582581564-184429-4-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/util.h')
| -rw-r--r-- | tools/perf/util/util.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 9969b8b46f7c..f486fdd3a538 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -29,6 +29,8 @@ size_t hex_width(u64 v); int sysctl__max_stack(void); +bool sysctl__nmi_watchdog_enabled(void); + int fetch_kernel_version(unsigned int *puint, char *str, size_t str_sz); #define KVER_VERSION(x) (((x) >> 16) & 0xff) |