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9321f8152d
linux/kernel/locking
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Thomas Gleixner 9321f8152d rtmutex: Wake up the waiters lockless while dropping the read lock. 
The rw_semaphore and rwlock_t implementation both wake the waiter while
holding the rt_mutex_base::wait_lock acquired.
This can be optimized by waking the waiter lockless outside of the
locked section to avoid a needless contention on the
rt_mutex_base::wait_lock lock.

Extend rt_mutex_wake_q_add() to also accept task and state and use it in
__rwbase_read_unlock().

Suggested-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210928150006.597310-3-bigeasy@linutronix.de
2021-10-01 13:57:52 +02:00
..
irqflag-debug.c lockdep: Noinstr annotate warn_bogus_irq_restore() 2021-02-10 14:44:39 +01:00
lock_events_list.h locking/rwsem: Remove reader optimistic spinning 2020-12-09 17:08:48 +01:00
lock_events.c locking/lock_events: Don't show pvqspinlock events on bare metal 2019-04-10 10:56:05 +02:00
lock_events.h locking/lock_events: Use raw_cpu_{add,inc}() for stats 2019-06-03 12:32:56 +02:00
lockdep_internals.h lockdep: Allow tuning tracing capacity constants. 2021-04-05 20:33:57 +09:00
lockdep_proc.c locking/lockdep: Fix meaningless /proc/lockdep output of lock classes on !CONFIG_PROVE_LOCKING 2021-07-05 10:44:52 +02:00
lockdep_states.h locking/lockdep: Rework FS_RECLAIM annotation 2017-08-10 12:29:03 +02:00
lockdep.c lockdep: Improve comments in wait-type checks 2021-09-17 15:08:45 +02:00
locktorture.c locktorture: Count lock readers 2021-07-27 11:39:30 -07:00
Makefile locking/ww_mutex: Implement rtmutex based ww_mutex API functions 2021-08-17 19:05:26 +02:00
mcs_spinlock.h locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
mutex-debug.c locking/ww_mutex: Gather mutex_waiter initialization 2021-08-17 19:04:41 +02:00
mutex.c kernel/locking: Add context to ww_mutex_trylock() 2021-09-17 15:08:41 +02:00
mutex.h locking/mutex: Move the 'struct mutex_waiter' definition from <linux/mutex.h> to the internal header 2021-08-17 18:24:31 +02:00
osq_lock.c locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
percpu-rwsem.c locking/percpu-rwsem: Use this_cpu_{inc,dec}() for read_count 2020-09-16 16:26:56 +02:00
qrwlock.c locking/qrwlock: Cleanup queued_write_lock_slowpath() 2021-05-06 15:33:49 +02:00
qspinlock_paravirt.h Revert "locking/pvqspinlock: Don't wait if vCPU is preempted" 2019-09-25 10:22:37 +02:00
qspinlock_stat.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
qspinlock.c x86/kvm: Add "nopvspin" parameter to disable PV spinlocks 2020-07-08 16:21:57 -04:00
rtmutex_api.c locking/rtmutex: Prevent lockdep false positive with PI futexes 2021-08-17 19:06:02 +02:00
rtmutex_common.h locking/rtmutex: Dont dereference waiter lockless 2021-08-25 15:42:32 +02:00
rtmutex.c rtmutex: Wake up the waiters lockless while dropping the read lock. 2021-10-01 13:57:52 +02:00
rwbase_rt.c rtmutex: Wake up the waiters lockless while dropping the read lock. 2021-10-01 13:57:52 +02:00
rwsem.c locking/rwsem: Add missing __init_rwsem() for PREEMPT_RT 2021-09-02 22:07:17 +02:00
semaphore.c locking/semaphore: Add might_sleep() to down_*() family 2021-08-20 12:33:17 +02:00
spinlock_debug.c locking/rwlock: Provide RT variant 2021-08-17 17:50:51 +02:00
spinlock_rt.c locking/rt: Take RCU nesting into account for __might_resched() 2021-10-01 13:57:51 +02:00
spinlock.c locking/rwlock: Provide RT variant 2021-08-17 17:50:51 +02:00
test-ww_mutex.c locking/ww-mutex: Fix uninitialized use of ret in test_aa() 2021-10-01 13:57:49 +02:00
ww_mutex.h locking/ww_mutex: Add rt_mutex based lock type and accessors 2021-08-17 19:05:11 +02:00
ww_rt_mutex.c kernel/locking: Add context to ww_mutex_trylock() 2021-09-17 15:08:41 +02:00