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 */ __lockevent_inc(enum lock_events event,bool cond)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 __lockevent_add(enum lock_events event,int inc)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) do { (void)(c); } while (0) 57 #define lockevent_cond_inc(ev, c) do { (void)(c); } while (0) 58 59 #endif /* CONFIG_LOCK_EVENT_COUNTS */ 60 61 ssize_t lockevent_read(struct file *file, char __user *user_buf, 62 size_t count, loff_t *ppos); 63 64 #endif /* __LOCKING_LOCK_EVENTS_H */ 65