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463ec4065b
Signed-off-by: Justin Pettit <jpettit@ovn.org> Acked-by: Mark Michelson <mmichels@redhat.com>
60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/* Copyright (c) 2017 Red Hat, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef STOPWATCH_H
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#define STOPWATCH_H 1
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#include <stdbool.h>
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enum stopwatch_units {
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SW_MS,
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SW_US,
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SW_NS,
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};
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struct stopwatch_stats {
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unsigned long long count; /* Total number of samples. */
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enum stopwatch_units unit; /* Unit of following values. */
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unsigned long long max; /* Maximum value. */
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unsigned long long min; /* Minimum value. */
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double pctl_95; /* 95th percentile. */
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double ewma_50; /* Exponentially weighted moving average
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(alpha 0.50). */
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double ewma_1; /* Exponentially weighted moving average
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(alpha 0.01). */
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};
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/* Create a new stopwatch.
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* The "units" are not used for any calculations but are printed when
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* statistics are requested.
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*/
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void stopwatch_create(const char *name, enum stopwatch_units units);
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/* Start a stopwatch. */
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void stopwatch_start(const char *name, unsigned long long ts);
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/* Stop a stopwatch. The elapsed time will be used for updating statistics
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* for this stopwatch.
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*/
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void stopwatch_stop(const char *name, unsigned long long ts);
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/* Retrieve statistics calculated from collected samples */
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bool stopwatch_get_stats(const char *name, struct stopwatch_stats *stats);
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/* Block until all enqueued samples have been processed. */
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void stopwatch_sync(void);
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#endif /* stopwatch.h */
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