kernel/locking/lock_events.h

   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
  19 enum 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  */
  31 DECLARE_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  */
  37 static 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
  46 static 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 */