Messages in this thread Patch in this message | | | From | Yajun Deng <> | Subject | [PATCH] perf/core: fix perf_event_mux_interval_ms when set zero | Date | Tue, 14 Jun 2022 18:37:51 +0800 |
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The perf_event_mux_interval_ms is set to zero or one by default. It can't change back when someone changes it from zero to another value.
Make perf_event_mux_interval_ms to PERF_CPU_HRTIMER when set zero.
Fixes: 62b856397927 ("perf: Add sysfs entry to adjust multiplexing interval per PMU") Signed-off-by: Yajun Deng <yajun.deng@linux.dev> --- kernel/events/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index 61ad10862c21..73c8c7462bbf 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10954,9 +10954,12 @@ perf_event_mux_interval_ms_store(struct device *dev, if (ret) return ret; - if (timer < 1) + if (timer < 0) return -EINVAL; + if (timer < 1) + timer = PERF_CPU_HRTIMER; + /* same value, noting to do */ if (timer == pmu->hrtimer_interval_ms) return count; -- 2.25.1
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