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https://github.com/openvswitch/ovs
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f43e80e023
Often when debugging Open vSwitch, one will see in the logs that CPU usage has been high for some period of time, but it's totally unclear why. In an attempt to remedy the situation, this patch logs backtraces taken at regular intervals as a poor man's profiling alternative. Signed-off-by: Ethan Jackson <ethan@nicira.com>
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, 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 TIMEVAL_H
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#define TIMEVAL_H 1
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#include <time.h>
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#include "type-props.h"
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#include "util.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct ds;
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struct pollfd;
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struct timespec;
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struct timeval;
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/* POSIX allows floating-point time_t, but we don't support it. */
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BUILD_ASSERT_DECL(TYPE_IS_INTEGER(time_t));
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/* We do try to cater to unsigned time_t, but I want to know about it if we
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* ever encounter such a platform. */
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BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
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#define TIME_MAX TYPE_MAXIMUM(time_t)
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#define TIME_MIN TYPE_MINIMUM(time_t)
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/* Interval between updates to the reported time, in ms. This should not be
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* adjusted much below 10 ms or so with the current implementation, or too
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* much time will be wasted in signal handlers and calls to clock_gettime(). */
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#define TIME_UPDATE_INTERVAL 100
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/* True on systems (particularly x86-64 Linux) where clock_gettime() is
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* inexpensive. On these systems, we don't bother caching the current time.
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* Instead, we consult clock_gettime() directly when needed.
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*
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* False on systems where clock_gettime() is relatively expensive. On these
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* systems, we cache the current time and set up a periodic SIGALRM to remind
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* us to update it.
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*
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* Also false on systems (e.g. ESX) that don't support setting up timers based
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* on a monotonically increasing clock. */
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#ifndef CACHE_TIME
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#if defined ESX || (defined __x86_64__ && defined LINUX_DATAPATH)
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#define CACHE_TIME 0
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#else
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#define CACHE_TIME 1
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#endif
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#endif /* ifndef CACHE_TIME */
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void time_disable_restart(void);
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void time_enable_restart(void);
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void time_postfork(void);
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void time_refresh(void);
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time_t time_now(void);
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time_t time_wall(void);
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long long int time_msec(void);
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long long int time_wall_msec(void);
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void time_timespec(struct timespec *);
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void time_wall_timespec(struct timespec *);
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void time_alarm(unsigned int secs);
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int time_poll(struct pollfd *, int n_pollfds, long long int timeout_when,
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int *elapsed);
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bool time_cached(void);
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long long int timespec_to_msec(const struct timespec *);
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long long int timeval_to_msec(const struct timeval *);
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void xgettimeofday(struct timeval *);
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int get_cpu_usage(void);
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void format_backtraces(struct ds *, size_t min_count);
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long long int time_boot_msec(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* timeval.h */
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