diff options
author | Waiman Long <longman@redhat.com> | 2019-04-04 20:43:16 +0300 |
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committer | Ingo Molnar <mingo@kernel.org> | 2019-04-10 11:56:03 +0300 |
commit | ad53fa10fa9e816067bbae7109845940f5e6df50 (patch) | |
tree | f11a7988ec0c534516d75a86e60b0f68ffabf841 /kernel/locking/lock_events.h | |
parent | 3b4ba6643d26a95e08067fca9a5da1828f9afabf (diff) | |
download | linux-ad53fa10fa9e816067bbae7109845940f5e6df50.tar.xz |
locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs
The percpu event counts used by qspinlock code can be useful for
other locking code as well. So a new set of lockevent_* counting APIs
is introduced with the lock event names extracted out into the new
lock_events_list.h header file for easier addition in the future.
The existing qstat_inc() calls are replaced by either lockevent_inc() or
lockevent_cond_inc() calls.
The qstat_hop() call is renamed to lockevent_pv_hop(). The "reset_counters"
debugfs file is also renamed to ".reset_counts".
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/20190404174320.22416-8-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking/lock_events.h')
-rw-r--r-- | kernel/locking/lock_events.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/locking/lock_events.h b/kernel/locking/lock_events.h new file mode 100644 index 000000000000..4009e07b474a --- /dev/null +++ b/kernel/locking/lock_events.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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 2 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. + * + * Authors: Waiman Long <longman@redhat.com> + */ + +enum lock_events { + +#include "lock_events_list.h" + + lockevent_num, /* Total number of lock event counts */ + LOCKEVENT_reset_cnts = lockevent_num, +}; + +#ifdef CONFIG_QUEUED_LOCK_STAT +/* + * Per-cpu counters + */ +DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]); + +/* + * Increment the PV qspinlock statistical counters + */ +static inline void __lockevent_inc(enum lock_events event, bool cond) +{ + if (cond) + __this_cpu_inc(lockevents[event]); +} + +#define lockevent_inc(ev) __lockevent_inc(LOCKEVENT_ ##ev, true) +#define lockevent_cond_inc(ev, c) __lockevent_inc(LOCKEVENT_ ##ev, c) + +static inline void __lockevent_add(enum lock_events event, int inc) +{ + __this_cpu_add(lockevents[event], inc); +} + +#define lockevent_add(ev, c) __lockevent_add(LOCKEVENT_ ##ev, c) + +#else /* CONFIG_QUEUED_LOCK_STAT */ + +#define lockevent_inc(ev) +#define lockevent_add(ev, c) +#define lockevent_cond_inc(ev, c) + +#endif /* CONFIG_QUEUED_LOCK_STAT */ |