af811748e7
This commit hopefully improves the formatting of the codebase by setting
ColumnLimit to 0 and hence stopping clang-format from trying to put as
much stuff in one line as possible.
This change enabled us to remove most of `clang-format off` directives
and fixed a bunch of lines that looked like this:
```c
#define KEY \
VALUE /* comment */
```
Additionally, one pair of `clang-format off` / `clang-format on` had
`clang-format off` as the second comment and hence didn't enable the
formatting for the rest of the file. This commit addresses this issue as
well.
Please tell me if anything in the changes seem off. If everything is
fine, I will add this commit to `.git-blame-ignore-revs` later.
---------
Signed-off-by: Mikhail Koviazin <mikhail.koviazin@aiven.io>
109 lines
4.6 KiB
C
109 lines
4.6 KiB
C
/* latency.h -- latency monitor API header file
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* See latency.c for more information.
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*
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* ----------------------------------------------------------------------------
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*
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* Copyright (c) 2014, Redis Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __LATENCY_H
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#define __LATENCY_H
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#define LATENCY_TS_LEN 160 /* History length for every monitored event. */
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/* Representation of a latency sample: the sampling time and the latency
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* observed in milliseconds. */
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struct latencySample {
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int32_t time; /* We don't use time_t to force 4 bytes usage everywhere. */
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uint32_t latency; /* Latency in milliseconds. */
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};
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/* The latency time series for a given event. */
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struct latencyTimeSeries {
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int idx; /* Index of the next sample to store. */
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uint32_t max; /* Max latency observed for this event. */
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struct latencySample samples[LATENCY_TS_LEN]; /* Latest history. */
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};
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/* Latency statistics structure. */
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struct latencyStats {
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uint32_t all_time_high; /* Absolute max observed since latest reset. */
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uint32_t avg; /* Average of current samples. */
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uint32_t min; /* Min of current samples. */
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uint32_t max; /* Max of current samples. */
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uint32_t mad; /* Mean absolute deviation. */
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uint32_t samples; /* Number of non-zero samples. */
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time_t period; /* Number of seconds since first event and now. */
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};
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void latencyMonitorInit(void);
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void latencyAddSample(const char *event, mstime_t latency);
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/* Latency monitoring macros. */
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/* Start monitoring an event. We just set the current time. */
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#define latencyStartMonitor(var) \
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if (server.latency_monitor_threshold) { \
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var = mstime(); \
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} else { \
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var = 0; \
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}
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/* End monitoring an event, compute the difference with the current time
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* to check the amount of time elapsed. */
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#define latencyEndMonitor(var) \
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if (server.latency_monitor_threshold) { \
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var = mstime() - var; \
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}
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/* Add the sample only if the elapsed time is >= to the configured threshold. */
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#define latencyAddSampleIfNeeded(event, var) \
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if (server.latency_monitor_threshold && (var) >= server.latency_monitor_threshold) latencyAddSample((event), (var));
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/* Remove time from a nested event. */
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#define latencyRemoveNestedEvent(event_var, nested_var) event_var += nested_var;
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typedef struct durationStats {
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unsigned long long cnt;
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unsigned long long sum;
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unsigned long long max;
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} durationStats;
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typedef enum {
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EL_DURATION_TYPE_EL = 0, // cumulative time duration metric of the whole eventloop
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EL_DURATION_TYPE_CMD, // cumulative time duration metric of executing commands
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EL_DURATION_TYPE_AOF, // cumulative time duration metric of flushing AOF in eventloop
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EL_DURATION_TYPE_CRON, // cumulative time duration metric of cron (serverCron and beforeSleep, but excluding IO and
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// AOF)
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EL_DURATION_TYPE_NUM
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} DurationType;
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void durationAddSample(int type, monotime duration);
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#endif /* __LATENCY_H */
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