fix: time unit not match in ThreadMetricUtil.cpp (#5607)

close #5595

dbms/src/Common/ThreadMetricUtil.cpp

@@ -12,24 +12,24 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include <Common/Stopwatch.h>
 #include <Common/ThreadMetricUtil.h>
 #include <Common/TiFlashMetrics.h>
 #include <common/types.h>
 
-std::atomic<UInt64> last_max_thds_metric_reset_ts{0};
-const std::chrono::duration<UInt64> max_thds_metric_reset_interval{60}; // 60s
+using Clock = std::chrono::steady_clock;
+using TimePoint = Clock::time_point;
+std::atomic<TimePoint> last_max_thds_metric_reset_ts{};
+const std::chrono::seconds max_thds_metric_reset_interval{60}; // 60s
 
 namespace DB
 {
 bool tryToResetMaxThreadsMetrics()
 {
-    using nanoseconds = std::chrono::duration<UInt64, std::nano>;
-    UInt64 last_max_thds_metric_reset_ts_tmp = last_max_thds_metric_reset_ts.load(std::memory_order_relaxed);
-    UInt64 now_ts = clock_gettime_ns_adjusted(last_max_thds_metric_reset_ts_tmp, CLOCK_MONOTONIC);
-    if (nanoseconds(now_ts) > nanoseconds(last_max_thds_metric_reset_ts_tmp) + max_thds_metric_reset_interval)
+    auto last_max_thds_metric_reset_ts_tmp = last_max_thds_metric_reset_ts.load(std::memory_order_relaxed);
+    auto now = std::max(Clock::now(), last_max_thds_metric_reset_ts_tmp);
+    if (now > last_max_thds_metric_reset_ts_tmp + max_thds_metric_reset_interval)
     {
-        last_max_thds_metric_reset_ts.store(now_ts, std::memory_order_relaxed);
+        last_max_thds_metric_reset_ts.store(now, std::memory_order_relaxed);
         GET_METRIC(tiflash_thread_count, type_max_threads_of_dispatch_mpp).Set(GET_METRIC(tiflash_thread_count, type_active_threads_of_dispatch_mpp).Value());
         GET_METRIC(tiflash_thread_count, type_max_threads_of_establish_mpp).Set(GET_METRIC(tiflash_thread_count, type_active_threads_of_establish_mpp).Value());
         GET_METRIC(tiflash_thread_count, type_max_threads_of_raw).Set(GET_METRIC(tiflash_thread_count, type_total_threads_of_raw).Value());
@@ -39,4 +39,4 @@ bool tryToResetMaxThreadsMetrics()
     }
     return false;
 }
-} // namespace DB
+} // namespace DB