2 * Copyright (c) 2009, 2010 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
21 #include "coverage-counters.h"
22 #include "dynamic-string.h"
28 VLOG_DEFINE_THIS_MODULE(coverage)
30 static unsigned int epoch;
33 coverage_unixctl_log(struct unixctl_conn *conn, const char *args OVS_UNUSED,
36 coverage_log(VLL_WARN, false);
37 unixctl_command_reply(conn, 200, NULL);
43 unixctl_command_register("coverage/log", coverage_unixctl_log, NULL);
46 /* Sorts coverage counters in descending order by count, within equal counts
47 * alphabetically by name. */
49 compare_coverage_counters(const void *a_, const void *b_)
51 const struct coverage_counter *const *ap = a_;
52 const struct coverage_counter *const *bp = b_;
53 const struct coverage_counter *a = *ap;
54 const struct coverage_counter *b = *bp;
55 if (a->count != b->count) {
56 return a->count < b->count ? 1 : -1;
58 return strcmp(a->name, b->name);
65 struct coverage_counter **c;
69 /* Sort coverage counters into groups with equal counts. */
70 c = xmalloc(coverage_n_counters * sizeof *c);
71 for (i = 0; i < coverage_n_counters; i++) {
72 c[i] = coverage_counters[i];
74 qsort(c, coverage_n_counters, sizeof *c, compare_coverage_counters);
76 /* Hash the names in each group along with the rank. */
78 for (i = 0; i < coverage_n_counters; ) {
85 hash = hash_int(i, hash);
86 for (j = i; j < coverage_n_counters; j++) {
87 if (c[j]->count != c[i]->count) {
90 hash = hash_string(c[j]->name, hash);
97 return hash_int(n_groups, hash);
101 coverage_hit(uint32_t hash)
103 enum { HIT_BITS = 1024, BITS_PER_WORD = 32 };
104 static uint32_t hit[HIT_BITS / BITS_PER_WORD];
105 BUILD_ASSERT_DECL(IS_POW2(HIT_BITS));
107 unsigned int bit_index = hash & (HIT_BITS - 1);
108 unsigned int word_index = bit_index / BITS_PER_WORD;
109 unsigned int word_mask = 1u << (bit_index % BITS_PER_WORD);
111 if (hit[word_index] & word_mask) {
114 hit[word_index] |= word_mask;
120 coverage_log_counter(enum vlog_level level, const struct coverage_counter *c)
122 VLOG(level, "%-24s %5u / %9llu", c->name, c->count, c->count + c->total);
125 /* Logs the coverage counters at the given vlog 'level'. If
126 * 'suppress_dups' is true, then duplicate events are not displayed.
127 * Care should be taken in the value used for 'level'. Depending on the
128 * configuration, syslog can write changes synchronously, which can
129 * cause the coverage messages to take several seconds to write. */
131 coverage_log(enum vlog_level level, bool suppress_dups)
137 if (!vlog_is_enabled(THIS_MODULE, level)) {
141 hash = coverage_hash();
143 if (coverage_hit(hash)) {
144 VLOG(level, "Skipping details of duplicate event coverage for "
145 "hash=%08"PRIx32" in epoch %u", hash, epoch);
151 VLOG(level, "Event coverage (epoch %u/entire run), hash=%08"PRIx32":",
153 for (i = 0; i < coverage_n_counters; i++) {
154 struct coverage_counter *c = coverage_counters[i];
156 coverage_log_counter(level, c);
159 for (i = 0; i < coverage_n_counters; i++) {
160 struct coverage_counter *c = coverage_counters[i];
163 coverage_log_counter(level, c);
169 VLOG(level, "%zu events never hit", n_never_hit);
172 /* Advances to the next epoch of coverage, resetting all the counters to 0. */
179 for (i = 0; i < coverage_n_counters; i++) {
180 struct coverage_counter *c = coverage_counters[i];
181 c->total += c->count;