mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Waiman Long](/assets/img/avatar_default.png)
This rwlock uses the arch_spin_lock_t as a waitqueue, and assuming the arch_spin_lock_t is a fair lock (ticket,mcs etc..) the resulting rwlock is a fair lock. It fits in the same 8 bytes as the regular rwlock_t by folding the reader and writer count into a single integer, using the remaining 4 bytes for the arch_spinlock_t. Architectures that can single-copy adress bytes can optimize queue_write_unlock() with a 0 write to the LSB (the write count). Performance as measured by Davidlohr Bueso (rwlock_t -> qrwlock_t): +--------------+-------------+---------------+ | Workload | #users | delta | +--------------+-------------+---------------+ | alltests | > 1400 | -4.83% | | custom | 0-100,> 100 | +1.43%,-1.57% | | high_systime | > 1000 | -2.61 | | shared | all | +0.32 | +--------------+-------------+---------------+ http://www.stgolabs.net/qrwlock-stuff/aim7-results-vs-rwsem_optsin/ Signed-off-by: Waiman Long <Waiman.Long@hp.com> [peterz: near complete rewrite] Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "Paul E.McKenney" <paulmck@linux.vnet.ibm.com> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/n/tip-gac1nnl3wvs2ij87zv2xkdzq@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
232 lines
4.4 KiB
Text
232 lines
4.4 KiB
Text
#
|
|
# The ARCH_INLINE foo is necessary because select ignores "depends on"
|
|
#
|
|
config ARCH_INLINE_SPIN_TRYLOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_TRYLOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_LOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_LOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_LOCK_IRQ
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_LOCK_IRQSAVE
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_UNLOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_UNLOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_UNLOCK_IRQ
|
|
bool
|
|
|
|
config ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
|
|
bool
|
|
|
|
|
|
config ARCH_INLINE_READ_TRYLOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_LOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_LOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_LOCK_IRQ
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_LOCK_IRQSAVE
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_UNLOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_UNLOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_UNLOCK_IRQ
|
|
bool
|
|
|
|
config ARCH_INLINE_READ_UNLOCK_IRQRESTORE
|
|
bool
|
|
|
|
|
|
config ARCH_INLINE_WRITE_TRYLOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_LOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_LOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_LOCK_IRQ
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_LOCK_IRQSAVE
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_UNLOCK
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_UNLOCK_BH
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_UNLOCK_IRQ
|
|
bool
|
|
|
|
config ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
|
|
bool
|
|
|
|
config UNINLINE_SPIN_UNLOCK
|
|
bool
|
|
|
|
#
|
|
# lock_* functions are inlined when:
|
|
# - DEBUG_SPINLOCK=n and GENERIC_LOCKBREAK=n and ARCH_INLINE_*LOCK=y
|
|
#
|
|
# trylock_* functions are inlined when:
|
|
# - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
|
|
#
|
|
# unlock and unlock_irq functions are inlined when:
|
|
# - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
|
|
# or
|
|
# - DEBUG_SPINLOCK=n and PREEMPT=n
|
|
#
|
|
# unlock_bh and unlock_irqrestore functions are inlined when:
|
|
# - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
|
|
#
|
|
|
|
if !DEBUG_SPINLOCK
|
|
|
|
config INLINE_SPIN_TRYLOCK
|
|
def_bool y
|
|
depends on ARCH_INLINE_SPIN_TRYLOCK
|
|
|
|
config INLINE_SPIN_TRYLOCK_BH
|
|
def_bool y
|
|
depends on ARCH_INLINE_SPIN_TRYLOCK_BH
|
|
|
|
config INLINE_SPIN_LOCK
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_SPIN_LOCK
|
|
|
|
config INLINE_SPIN_LOCK_BH
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_SPIN_LOCK_BH
|
|
|
|
config INLINE_SPIN_LOCK_IRQ
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_SPIN_LOCK_IRQ
|
|
|
|
config INLINE_SPIN_LOCK_IRQSAVE
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_SPIN_LOCK_IRQSAVE
|
|
|
|
config INLINE_SPIN_UNLOCK_BH
|
|
def_bool y
|
|
depends on ARCH_INLINE_SPIN_UNLOCK_BH
|
|
|
|
config INLINE_SPIN_UNLOCK_IRQ
|
|
def_bool y
|
|
depends on !PREEMPT || ARCH_INLINE_SPIN_UNLOCK_IRQ
|
|
|
|
config INLINE_SPIN_UNLOCK_IRQRESTORE
|
|
def_bool y
|
|
depends on ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
|
|
|
|
|
|
config INLINE_READ_TRYLOCK
|
|
def_bool y
|
|
depends on ARCH_INLINE_READ_TRYLOCK
|
|
|
|
config INLINE_READ_LOCK
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_READ_LOCK
|
|
|
|
config INLINE_READ_LOCK_BH
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_READ_LOCK_BH
|
|
|
|
config INLINE_READ_LOCK_IRQ
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_READ_LOCK_IRQ
|
|
|
|
config INLINE_READ_LOCK_IRQSAVE
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_READ_LOCK_IRQSAVE
|
|
|
|
config INLINE_READ_UNLOCK
|
|
def_bool y
|
|
depends on !PREEMPT || ARCH_INLINE_READ_UNLOCK
|
|
|
|
config INLINE_READ_UNLOCK_BH
|
|
def_bool y
|
|
depends on ARCH_INLINE_READ_UNLOCK_BH
|
|
|
|
config INLINE_READ_UNLOCK_IRQ
|
|
def_bool y
|
|
depends on !PREEMPT || ARCH_INLINE_READ_UNLOCK_IRQ
|
|
|
|
config INLINE_READ_UNLOCK_IRQRESTORE
|
|
def_bool y
|
|
depends on ARCH_INLINE_READ_UNLOCK_IRQRESTORE
|
|
|
|
|
|
config INLINE_WRITE_TRYLOCK
|
|
def_bool y
|
|
depends on ARCH_INLINE_WRITE_TRYLOCK
|
|
|
|
config INLINE_WRITE_LOCK
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_WRITE_LOCK
|
|
|
|
config INLINE_WRITE_LOCK_BH
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_WRITE_LOCK_BH
|
|
|
|
config INLINE_WRITE_LOCK_IRQ
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_WRITE_LOCK_IRQ
|
|
|
|
config INLINE_WRITE_LOCK_IRQSAVE
|
|
def_bool y
|
|
depends on !GENERIC_LOCKBREAK && ARCH_INLINE_WRITE_LOCK_IRQSAVE
|
|
|
|
config INLINE_WRITE_UNLOCK
|
|
def_bool y
|
|
depends on !PREEMPT || ARCH_INLINE_WRITE_UNLOCK
|
|
|
|
config INLINE_WRITE_UNLOCK_BH
|
|
def_bool y
|
|
depends on ARCH_INLINE_WRITE_UNLOCK_BH
|
|
|
|
config INLINE_WRITE_UNLOCK_IRQ
|
|
def_bool y
|
|
depends on !PREEMPT || ARCH_INLINE_WRITE_UNLOCK_IRQ
|
|
|
|
config INLINE_WRITE_UNLOCK_IRQRESTORE
|
|
def_bool y
|
|
depends on ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
|
|
|
|
endif
|
|
|
|
config MUTEX_SPIN_ON_OWNER
|
|
def_bool y
|
|
depends on SMP && !DEBUG_MUTEXES
|
|
|
|
config ARCH_USE_QUEUE_RWLOCK
|
|
bool
|
|
|
|
config QUEUE_RWLOCK
|
|
def_bool y if ARCH_USE_QUEUE_RWLOCK
|
|
depends on SMP
|