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/*
* Copyright (c) 2010, 2011 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef STRESS_H
#define STRESS_H 1
#include <stdbool.h>
struct stress_option {
/* Properties. */
char *name; /* Short identifier string */
char *description; /* Description of what the option stresses. */
unsigned int recommended; /* Recommended period. */
unsigned int min; /* Minimum period that can be set. */
unsigned int max; /* Maximum period that can be set. */
unsigned int def; /* Default value. */
/* Configuration. */
unsigned int period; /* Desired period for firing, 0 to disable. */
bool random; /* Fire randomly or exactly at period? */
/* State. */
unsigned int counter; /* Number of hits before next firing. */
unsigned long long int hits; /* Hits since last reset. */
};
/* Creates and initializes a global instance of a stress option.
*
* NAME is a single word descriptive identifier for the option. This is the
* token to pass in to the STRESS() macro at the sites where exectution is to
* be controlled by the option.
*
* DESCRIPTION is a quoted string that should describe to a person unfamiliar
* with the detailed internals of the code what behavior the option affects.
*
* RECOMMENDED is a suggested value for a person unfamiliar with the internals.
* It should put reasonable stress on the system without crippling it.
*
* MIN and MAX are the minimum and maximum values allowed for the option.
*
* DEFAULT is the default value for the option. Specify 0 to disable the
* option by default, which should be the usual choice. But some options can
* be left on at low levels without noticable impact to the end user. An
* example would be failing to allocate a buffer for every 100000th packet
* processed by the system.
*/
#if USE_LINKER_SECTIONS
#define STRESS_OPTION(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT) \
STRESS_OPTION__(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT); \
extern struct stress_option *stress_option_ptr_##NAME; \
struct stress_option *stress_option_ptr_##NAME \
__attribute__((section("stress_options"))) = &stress_##NAME
#else
#define STRESS_OPTION(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT) \
extern struct stress_option stress_##NAME
#endif
/* Yields true if stress option NAME should be triggered,
* false otherwise. */
#define STRESS(NAME) stress_sample__(&stress_##NAME)
void stress_init_command(void);
/* Implementation details. */
#define STRESS_OPTION__(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT) \
extern struct stress_option stress_##NAME; \
struct stress_option stress_##NAME = \
{ #NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT, \
DEFAULT ? DEFAULT : 0, /* period */ \
false, /* random */ \
UINT_MAX, /* counter */ \
0 } /* hits */
bool stress_sample_slowpath__(struct stress_option *);
static inline bool stress_sample__(struct stress_option *option)
{
return --option->counter == 0 && stress_sample_slowpath__(option);
}
#endif /* STRESS_H */
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