LXR linux/kernel/locking/lock

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * This program is free software; you can redistribute it and/or modify
   4 * it under the terms of the GNU General Public License as published by
   5 * the Free Software Foundation; either version 2 of the License, or
   6 * (at your option) any later version.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * Authors: Waiman Long <longman@redhat.com>
  14 */
  15
  16#ifndef __LOCKING_LOCK_EVENTS_H
  17#define __LOCKING_LOCK_EVENTS_H
  18
  19enum lock_events {
  20
  21#include "lock_events_list.h"
  22
  23        lockevent_num,  /* Total number of lock event counts */
  24        LOCKEVENT_reset_cnts = lockevent_num,
  25};
  26
  27#ifdef CONFIG_LOCK_EVENT_COUNTS
  28/*
  29 * Per-cpu counters
  30 */
  31DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]);
  32
  33/*
  34 * Increment the statistical counters. use raw_cpu_inc() because of lower
  35 * overhead and we don't care if we loose the occasional update.
  36 */
  37static inline void __lockevent_inc(enum lock_events event, bool cond)
  38{
  39        if (cond)
  40                raw_cpu_inc(lockevents[event]);
  41}
  42
  43#define lockevent_inc(ev)         __lockevent_inc(LOCKEVENT_ ##ev, true)
  44#define lockevent_cond_inc(ev, c) __lockevent_inc(LOCKEVENT_ ##ev, c)
  45
  46static inline void __lockevent_add(enum lock_events event, int inc)
  47{
  48        raw_cpu_add(lockevents[event], inc);
  49}
  50
  51#define lockevent_add(ev, c)    __lockevent_add(LOCKEVENT_ ##ev, c)
  52
  53#else  /* CONFIG_LOCK_EVENT_COUNTS */
  54
  55#define lockevent_inc(ev)
  56#define lockevent_add(ev, c)
  57#define lockevent_cond_inc(ev, c)
  58
  59#endif /* CONFIG_LOCK_EVENT_COUNTS */
  60#endif /* __LOCKING_LOCK_EVENTS_H */
  61