search for: queue_spin_lock_unfair

Displaying 20 results from an estimated 40 matches for "queue_spin_lock_unfair".

[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 Jun 11
3
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...t queue_spin_trylock_unfair(struct qspinlock *lock) > +{ > + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > + > + if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) > + return 1; > + return 0; > +} > + > +/** > + * queue_spin_lock_unfair - acquire a queue spinlock unfairly > + * @lock: Pointer to queue spinlock structure > + */ > +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) > +{ > + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > + > + if (likely(cmpxchg(&qlock-&...
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 Jun 11
3
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...t queue_spin_trylock_unfair(struct qspinlock *lock) > +{ > + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > + > + if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) > + return 1; > + return 0; > +} > + > +/** > + * queue_spin_lock_unfair - acquire a queue spinlock unfairly > + * @lock: Pointer to queue spinlock structure > + */ > +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) > +{ > + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > + > + if (likely(cmpxchg(&qlock-&...
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 Jun 12
2
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...;+ union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > >>+ > >>+ if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) > >>+ return 1; > >>+ return 0; > >>+} > >>+ > >>+/** > >>+ * queue_spin_lock_unfair - acquire a queue spinlock unfairly > >>+ * @lock: Pointer to queue spinlock structure > >>+ */ > >>+static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) > >>+{ > >>+ union arch_qspinlock *qlock = (union arch_qspinlock *)lock; >...
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 Jun 12
2
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...;+ union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > >>+ > >>+ if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) > >>+ return 1; > >>+ return 0; > >>+} > >>+ > >>+/** > >>+ * queue_spin_lock_unfair - acquire a queue spinlock unfairly > >>+ * @lock: Pointer to queue spinlock structure > >>+ */ > >>+static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) > >>+{ > >>+ union arch_qspinlock *qlock = (union arch_qspinlock *)lock; >...
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 Jun 12
0
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...lock *lock) >> +{ >> + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; >> + >> + if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) >> + return 1; >> + return 0; >> +} >> + >> +/** >> + * queue_spin_lock_unfair - acquire a queue spinlock unfairly >> + * @lock: Pointer to queue spinlock structure >> + */ >> +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) >> +{ >> + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; >> + >> + if...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 13
2
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: > +static inline void arch_spin_lock(struct qspinlock *lock) > +{ > + if (static_key_false(&paravirt_unfairlocks_enabled)) > + queue_spin_lock_unfair(lock); > + else > + queue_spin_lock(lock); > +} So I would have expected something like: if (static_key_false(&paravirt_spinlock)) { while (!queue_spin_trylock(lock)) cpu_relax(); return; } At the top of queue_spin_lock_slowpath(). > +static inline int arch_spin_tryloc...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 13
2
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: > +static inline void arch_spin_lock(struct qspinlock *lock) > +{ > + if (static_key_false(&paravirt_unfairlocks_enabled)) > + queue_spin_lock_unfair(lock); > + else > + queue_spin_lock(lock); > +} So I would have expected something like: if (static_key_false(&paravirt_spinlock)) { while (!queue_spin_trylock(lock)) cpu_relax(); return; } At the top of queue_spin_lock_slowpath(). > +static inline int arch_spin_tryloc...
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
2014 Feb 26
0
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
...ude/asm/qspinlock.h index 98db42e..c278aed 100644 --- a/arch/x86/include/asm/qspinlock.h +++ b/arch/x86/include/asm/qspinlock.h @@ -56,4 +56,78 @@ static inline void queue_spin_unlock(struct qspinlock *lock) #include <asm-generic/qspinlock.h> +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS +/** + * queue_spin_lock_unfair - acquire a queue spinlock unfairly + * @lock: Pointer to queue spinlock structure + */ +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + if (likely(cmpxchg(&qlock->lock, 0, _QSPINLOCK_LOCKED) == 0...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 12
0
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
...ude/asm/qspinlock.h index 7f3129c..0e6740a 100644 --- a/arch/x86/include/asm/qspinlock.h +++ b/arch/x86/include/asm/qspinlock.h @@ -51,4 +51,76 @@ static inline void queue_spin_unlock(struct qspinlock *lock) #include <asm-generic/qspinlock.h> +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS +/** + * queue_spin_lock_unfair - acquire a queue spinlock unfairly + * @lock: Pointer to queue spinlock structure + */ +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + if (likely(cmpxchg(&qlock->lock, 0, _QSPINLOCK_LOCKED) == 0...
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
2014 Feb 26
2
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
...0644 > --- a/arch/x86/include/asm/qspinlock.h > +++ b/arch/x86/include/asm/qspinlock.h > @@ -56,4 +56,78 @@ static inline void queue_spin_unlock(struct qspinlock *lock) > > #include <asm-generic/qspinlock.h> > > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/** > + * queue_spin_lock_unfair - acquire a queue spinlock unfairly > + * @lock: Pointer to queue spinlock structure > + */ > +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) > +{ > + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > + > + if (likely(cmpxchg(&qlock-&...
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
2014 Feb 26
2
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
...0644 > --- a/arch/x86/include/asm/qspinlock.h > +++ b/arch/x86/include/asm/qspinlock.h > @@ -56,4 +56,78 @@ static inline void queue_spin_unlock(struct qspinlock *lock) > > #include <asm-generic/qspinlock.h> > > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/** > + * queue_spin_lock_unfair - acquire a queue spinlock unfairly > + * @lock: Pointer to queue spinlock structure > + */ > +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) > +{ > + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; > + > + if (likely(cmpxchg(&qlock-&...
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 May 30
0
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...uired, 0 if failed + */ +static __always_inline int queue_spin_trylock_unfair(struct qspinlock *lock) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) + return 1; + return 0; +} + +/** + * queue_spin_lock_unfair - acquire a queue spinlock unfairly + * @lock: Pointer to queue spinlock structure + */ +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + if (likely(cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0))...
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 Jun 12
0
[PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest
...(union arch_qspinlock *)lock; >>>> + >>>> + if (!qlock->locked&& (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) >>>> + return 1; >>>> + return 0; >>>> +} >>>> + >>>> +/** >>>> + * queue_spin_lock_unfair - acquire a queue spinlock unfairly >>>> + * @lock: Pointer to queue spinlock structure >>>> + */ >>>> +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) >>>> +{ >>>> + union arch_qspinlock *qlock = (union arch_qsp...
[PATCH v10 10/19] qspinlock, x86: Allow unfair spinlock in a virtual guest
2014 May 07
0
[PATCH v10 10/19] qspinlock, x86: Allow unfair spinlock in a virtual guest
...uired, 0 if failed + */ +static __always_inline int queue_spin_trylock_unfair(struct qspinlock *lock) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + if (!qlock->locked && (cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0)) + return 1; + return 0; +} + +/** + * queue_spin_lock_unfair - acquire a queue spinlock unfairly + * @lock: Pointer to queue spinlock structure + */ +static __always_inline void queue_spin_lock_unfair(struct qspinlock *lock) +{ + union arch_qspinlock *qlock = (union arch_qspinlock *)lock; + + if (likely(cmpxchg(&qlock->locked, 0, _Q_LOCKED_VAL) == 0))...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 14
4
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
...e: > On 03/13/2014 11:15 AM, Peter Zijlstra wrote: > >On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: > >>+static inline void arch_spin_lock(struct qspinlock *lock) > >>+{ > >>+ if (static_key_false(&paravirt_unfairlocks_enabled)) > >>+ queue_spin_lock_unfair(lock); > >>+ else > >>+ queue_spin_lock(lock); > >>+} > >So I would have expected something like: > > > > if (static_key_false(&paravirt_spinlock)) { > > while (!queue_spin_trylock(lock)) > > cpu_relax(); > > return; > >...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 14
4
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
...e: > On 03/13/2014 11:15 AM, Peter Zijlstra wrote: > >On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: > >>+static inline void arch_spin_lock(struct qspinlock *lock) > >>+{ > >>+ if (static_key_false(&paravirt_unfairlocks_enabled)) > >>+ queue_spin_lock_unfair(lock); > >>+ else > >>+ queue_spin_lock(lock); > >>+} > >So I would have expected something like: > > > > if (static_key_false(&paravirt_spinlock)) { > > while (!queue_spin_trylock(lock)) > > cpu_relax(); > > return; > >...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 17
2
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
...jlstra wrote: > >>>On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: > >>>>+static inline void arch_spin_lock(struct qspinlock *lock) > >>>>+{ > >>>>+ if (static_key_false(&paravirt_unfairlocks_enabled)) > >>>>+ queue_spin_lock_unfair(lock); > >>>>+ else > >>>>+ queue_spin_lock(lock); > >>>>+} > >>>So I would have expected something like: > >>> > >>> if (static_key_false(&paravirt_spinlock)) { > >>> while (!queue_spin_trylock(lock)...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 17
2
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
...jlstra wrote: > >>>On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: > >>>>+static inline void arch_spin_lock(struct qspinlock *lock) > >>>>+{ > >>>>+ if (static_key_false(&paravirt_unfairlocks_enabled)) > >>>>+ queue_spin_lock_unfair(lock); > >>>>+ else > >>>>+ queue_spin_lock(lock); > >>>>+} > >>>So I would have expected something like: > >>> > >>> if (static_key_false(&paravirt_spinlock)) { > >>> while (!queue_spin_trylock(lock)...
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
2014 Mar 13
0
[PATCH v6 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest
On 03/13/2014 11:15 AM, Peter Zijlstra wrote: > On Wed, Mar 12, 2014 at 02:54:52PM -0400, Waiman Long wrote: >> +static inline void arch_spin_lock(struct qspinlock *lock) >> +{ >> + if (static_key_false(&paravirt_unfairlocks_enabled)) >> + queue_spin_lock_unfair(lock); >> + else >> + queue_spin_lock(lock); >> +} > So I would have expected something like: > > if (static_key_false(&paravirt_spinlock)) { > while (!queue_spin_trylock(lock)) > cpu_relax(); > return; > } > > At the top of queue_spin_lock...
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
2014 Feb 28
0
[PATCH RFC v5 4/8] pvqspinlock, x86: Allow unfair spinlock in a real PV environment
...gt;> +/** >> + * arch_spin_lock - acquire a queue spinlock >> + * @lock: Pointer to queue spinlock structure >> + */ >> +static inline void arch_spin_lock(struct qspinlock *lock) >> +{ >> + if (static_key_false(&paravirt_unfairlocks_enabled)) { >> + queue_spin_lock_unfair(lock); >> + return; >> + } >> + queue_spin_lock(lock); > What happens when you are booting and you are in the middle of using a > ticketlock (say you are waiting for it and your are in the slow-path) > and suddenly the unfairlocks_enabled is turned on. The static key...