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https://github.com/openvswitch/ovs
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857165b5fd
This makes each of the coverage counters per-thread. It abandons the idea of trying to keep track of the number of hits in the "current" poll loop, since there are many poll loops running, each in its own thread, as well as the idea of numbering epochs for the same reason. Instead, we just keep track of overall totals for the process for each coverage counter, accumulating per-thread counts into the global total each time a thread's main loop passes through poll_block(). Signed-off-by: Ben Pfaff <blp@nicira.com>
88 lines
3.9 KiB
C
88 lines
3.9 KiB
C
/*
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* Copyright (c) 2009, 2010, 2011, 2012, 2013 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 COVERAGE_H
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#define COVERAGE_H 1
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/* This file implements a simple form of coverage instrumentation. Points in
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* source code that are of interest must be explicitly annotated with
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* COVERAGE_INC. The coverage counters may be logged at any time with
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* coverage_log().
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*
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* This form of coverage instrumentation is intended to be so lightweight that
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* it can be enabled in production builds. It is obviously not a substitute
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* for traditional coverage instrumentation with e.g. "gcov", but it is still
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* a useful debugging tool. */
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#include "ovs-thread.h"
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#include "vlog.h"
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/* A coverage counter. */
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struct coverage_counter {
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const char *const name; /* Textual name. */
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unsigned int (*const count)(void); /* Gets, zeros this thread's count. */
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unsigned long long int total; /* Total count. */
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};
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/* Defines COUNTER. There must be exactly one such definition at file scope
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* within a program. */
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#if USE_LINKER_SECTIONS
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#define COVERAGE_DEFINE(COUNTER) \
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DEFINE_STATIC_PER_THREAD_DATA(unsigned int, \
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counter_##COUNTER, 0); \
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static unsigned int COUNTER##_count(void) \
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{ \
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unsigned int *countp = counter_##COUNTER##_get(); \
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unsigned int count = *countp; \
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*countp = 0; \
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return count; \
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} \
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static inline void COUNTER##_add(unsigned int n) \
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{ \
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*counter_##COUNTER##_get() += n; \
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} \
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extern struct coverage_counter counter_##COUNTER; \
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struct coverage_counter counter_##COUNTER \
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= { #COUNTER, COUNTER##_count, 0 }; \
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extern struct coverage_counter *counter_ptr_##COUNTER; \
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struct coverage_counter *counter_ptr_##COUNTER \
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__attribute__((section("coverage"))) = &counter_##COUNTER
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#else
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#define COVERAGE_DEFINE(COUNTER) \
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DECLARE_EXTERN_PER_THREAD_DATA(unsigned int, \
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counter_##COUNTER); \
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static inline void COUNTER##_add(unsigned int n) \
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{ \
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*counter_##COUNTER##_get() += n; \
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} \
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extern struct coverage_counter counter_##COUNTER
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#endif
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/* Adds 1 to COUNTER. */
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#define COVERAGE_INC(COUNTER) COVERAGE_ADD(COUNTER, 1)
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/* Adds AMOUNT to COUNTER. */
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#define COVERAGE_ADD(COUNTER, AMOUNT) COUNTER##_add(AMOUNT)
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void coverage_init(void);
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void coverage_log(void);
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void coverage_clear(void);
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/* Implementation detail. */
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#define COVERAGE_DEFINE__(COUNTER) \
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#endif /* coverage.h */
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