search for: queue_spin_trylock_and_clr_qcode

...New queue code to be exchanged + * Return: The original qcode value in the queue spinlock + */ +static inline u32 queue_code_xchg(struct qspinlock *lock, u32 qcode) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + return (u32)xchg(&qlock->qcode, (u16)qcode); +} + +#define queue_spin_trylock_and_clr_qcode queue_spin_trylock_and_clr_qcode +/** + * queue_spin_trylock_and_clr_qcode - Try to lock & clear qcode simultaneously + * @lock : Pointer to queue spinlock structure + * @qcode: The supposedly current qcode value + * Return: true if successful, false otherwise + */ +static inline int +queue_spi...

...New queue code to be exchanged + * Return: The original qcode value in the queue spinlock + */ +static inline u32 queue_code_xchg(struct qspinlock *lock, u32 qcode) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + return (u32)xchg(&qlock->qcode, (u16)qcode); +} + +#define queue_spin_trylock_and_clr_qcode queue_spin_trylock_and_clr_qcode +/** + * queue_spin_trylock_and_clr_qcode - Try to lock & clear qcode simultaneously + * @lock : Pointer to queue spinlock structure + * @qcode: The supposedly current qcode value + * Return: true if successful, false otherwise + */ +static inline int +queue_spi...

...+/** + * qsval_to_qcode - Convert a queue spinlock value to a queue code + * @qsval : Queue spinlock value + * Return : The corresponding queue code value + */ +static inline u32 +qsval_to_qcode(int qsval) +{ + return (u32)(qsval & ~_QLOCK_LOCK_MASK); +} +#endif /* qsval_to_qcode */ + +#ifndef queue_spin_trylock_and_clr_qcode +/** + * queue_spin_trylock_and_clr_qcode - Try to lock & clear qcode simultaneously + * @lock : Pointer to queue spinlock structure + * @qcode: The supposedly current qcode value + * Return: true if successful, false otherwise + */ +static inline int +queue_spin_trylock_and_clr_qcode(struct qs...

...ock is not available, = 0 if lock is free + */ +static inline int +queue_get_lock_qcode(struct qspinlock *lock, u32 *qcode, u32 mycode) +{ + int qlcode = atomic_read(&lock->qlcode); + + *qcode = qlcode; + return qlcode & _QSPINLOCK_LOCKED; +} +#endif /* queue_get_lock_qcode */ + +#ifndef queue_spin_trylock_and_clr_qcode +/** + * queue_spin_trylock_and_clr_qcode - Try to lock & clear qcode simultaneously + * @lock : Pointer to queue spinlock structure + * @qcode: The supposedly current qcode value + * Return: true if successful, false otherwise + */ +static inline int +queue_spin_trylock_and_clr_qcode(struct qs...

...ock is not available, = 0 if lock is free + */ +static inline int +queue_get_lock_qcode(struct qspinlock *lock, u32 *qcode, u32 mycode) +{ + int qlcode = atomic_read(&lock->qlcode); + + *qcode = qlcode; + return qlcode & _QSPINLOCK_LOCKED; +} +#endif /* queue_get_lock_qcode */ + +#ifndef queue_spin_trylock_and_clr_qcode +/** + * queue_spin_trylock_and_clr_qcode - Try to lock & clear qcode simultaneously + * @lock : Pointer to queue spinlock structure + * @qcode: The supposedly current qcode value + * Return: true if successful, false otherwise + */ +static inline int +queue_spin_trylock_and_clr_qcode(struct qs...

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue