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/*
* Copyright (c) 2014 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* Generic event counters.
*/
#ifndef _KERN_EVCNT_H
#define _KERN_EVCNT_H
#include <kern/list.h>
/*
* Size of the buffer storing an event counter name.
*/
#define EVCNT_NAME_SIZE 32
/*
* Event counter structure.
*
* Event counters are guaranteed to be 64-bits wide.
*/
struct evcnt {
unsigned long long count;
struct list node;
char name[EVCNT_NAME_SIZE];
};
/*
* Initialize the evcnt module.
*
* This module is initialized by architecture-specific code. It is normally
* safe to call this function very early at boot time.
*/
void evcnt_setup(void);
/*
* Register the given counter.
*/
void evcnt_register(struct evcnt *evcnt, const char *name);
/*
* Increment the given counter.
*
* It is the responsibility of the caller to synchronize access to the
* counter.
*/
static inline void
evcnt_inc(struct evcnt *evcnt)
{
evcnt->count++;
}
/*
* Batched increment.
*
* It is the responsibility of the caller to synchronize access to the
* counter.
*/
static inline void
evcnt_add(struct evcnt *evcnt, unsigned long long delta)
{
evcnt->count += delta;
}
/*
* Obtain the current value of the given counter.
*
* Since counters are 64-bits wide, retrieving them on 32-bits systems might
* return invalid values, although this should be very rare. As long as users
* don't rely on them for critical operations, this is completely harmless.
*/
static inline unsigned long long
evcnt_read(const struct evcnt *evcnt)
{
return evcnt->count;
}
/*
* Display the registered event counters.
*
* A pattern can be used to filter the output. The result will only include
* counters for which the beginning of their name matches the pattern.
* If NULL, all counters are reported.
*/
void evcnt_info(const char *pattern);
#endif /* _KERN_EVCNT_H */
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