mirror of
https://github.com/openvswitch/ovs
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61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
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/*
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* Copyright (c) 2017 Ericsson AB.
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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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#include <config.h>
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#include "openvswitch/dynamic-string.h"
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#include "openvswitch/vlog.h"
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#include "dpif-netdev-perf.h"
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#include "timeval.h"
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VLOG_DEFINE_THIS_MODULE(pmd_perf);
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void
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pmd_perf_stats_init(struct pmd_perf_stats *s)
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{
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memset(s, 0 , sizeof(*s));
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}
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void
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pmd_perf_read_counters(struct pmd_perf_stats *s,
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uint64_t stats[PMD_N_STATS])
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{
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uint64_t val;
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/* These loops subtracts reference values (.zero[*]) from the counters.
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* Since loads and stores are relaxed, it might be possible for a .zero[*]
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* value to be more recent than the current value we're reading from the
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* counter. This is not a big problem, since these numbers are not
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* supposed to be 100% accurate, but we should at least make sure that
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* the result is not negative. */
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for (int i = 0; i < PMD_N_STATS; i++) {
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atomic_read_relaxed(&s->counters.n[i], &val);
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if (val > s->counters.zero[i]) {
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stats[i] = val - s->counters.zero[i];
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} else {
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stats[i] = 0;
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}
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}
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}
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void
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pmd_perf_stats_clear(struct pmd_perf_stats *s)
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{
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for (int i = 0; i < PMD_N_STATS; i++) {
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atomic_read_relaxed(&s->counters.n[i], &s->counters.zero[i]);
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}
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}
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