search for: xen_lock_spinning

...void check_zero(void) > { > u8 ret; > - u8 old = ACCESS_ONCE(zero_stats); > + u8 old = READ_ONCE(zero_stats); > if (unlikely(old)) { > ret = cmpxchg(&zero_stats, old, 0); > /* This ensures only one fellow resets the stat */ > @@ -112,6 +112,7 @@ __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) > struct xen_lock_waiting *w = this_cpu_ptr(&lock_waiting); > int cpu = smp_processor_id(); > u64 start; > + __ticket_t head; > unsigned long flags; > > /* If kicker interrupts not initialized yet, just spin */ > @...

...void check_zero(void) > { > u8 ret; > - u8 old = ACCESS_ONCE(zero_stats); > + u8 old = READ_ONCE(zero_stats); > if (unlikely(old)) { > ret = cmpxchg(&zero_stats, old, 0); > /* This ensures only one fellow resets the stat */ > @@ -112,6 +112,7 @@ __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) > struct xen_lock_waiting *w = this_cpu_ptr(&lock_waiting); > int cpu = smp_processor_id(); > u64 start; > + __ticket_t head; > unsigned long flags; > > /* If kicker interrupts not initialized yet, just spin */ > @...

...ting { struct arch_spinlock *lock; __ticket_t want; }; -static DEFINE_PER_CPU(int, lock_kicker_irq) = -1; -static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting); static cpumask_t waiting_cpus; -static bool xen_pvspin = true; __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) { int irq = __this_cpu_read(lock_kicker_irq); @@ -217,6 +243,7 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) } } } +#endif /* !QUEUE_SPINLOCK */ static irqreturn_t dummy_handler(int irq, void *dev_id) { @@ -280,...

...ting { struct arch_spinlock *lock; __ticket_t want; }; -static DEFINE_PER_CPU(int, lock_kicker_irq) = -1; -static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting); static cpumask_t waiting_cpus; -static bool xen_pvspin = true; __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) { int irq = __this_cpu_read(lock_kicker_irq); @@ -217,6 +243,7 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) } } } +#endif /* !QUEUE_SPINLOCK */ static irqreturn_t dummy_handler(int irq, void *dev_id) { @@ -280,...

...+149,9 @@ struct xen_lock_waiting { __ticket_t want; }; -static DEFINE_PER_CPU(int, lock_kicker_irq) = -1; -static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting); static cpumask_t waiting_cpus; -static bool xen_pvspin = true; __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) { int irq = __this_cpu_read(lock_kicker_irq); @@ -217,6 +263,7 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) } } } +#endif /* CONFIG_QUEUE_SPINLOCK */ static irqreturn_t dummy_handler(int irq, void *dev_id) { @@...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Changes since last posting: (Raghavendra K T) [ - Rebased to linux-3.3-rc6. - used function+enum in place of macro (better type checking) - use cmpxchg while resetting zero status for possible race [suggested by Dave Hansen for KVM patches ] ] This series replaces the existing paravirtualized spinlock mechanism with a

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Changes since last posting: (Raghavendra K T) [ - Rebased to linux-3.3-rc6. - used function+enum in place of macro (better type checking) - use cmpxchg while resetting zero status for possible race [suggested by Dave Hansen for KVM patches ] ] This series replaces the existing paravirtualized spinlock mechanism with a

...+106,9 @@ struct xen_lock_waiting { __ticket_t want; }; -static DEFINE_PER_CPU(int, lock_kicker_irq) = -1; -static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting); static cpumask_t waiting_cpus; -static bool xen_pvspin = true; __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) { int irq = __this_cpu_read(lock_kicker_irq); @@ -213,6 +216,94 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) } } +#else /* CONFIG_QUEUE_SPINLOCK */ + +#ifdef CONFIG_XEN_DEBUG_FS +static u32 kick_stats; /* CPU kick...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. (targeted for 3.5 window) Changes in V7: - Reabsed patches to 3.4-rc3 - Added jumplabel split patch (originally from Andrew Jones rebased to 3.4-rc3 - jumplabel changes from Ingo and Jason taken and now using

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. (targeted for 3.5 window) Changes in V7: - Reabsed patches to 3.4-rc3 - Added jumplabel split patch (originally from Andrew Jones rebased to 3.4-rc3 - jumplabel changes from Ingo and Jason taken and now using

...+106,9 @@ struct xen_lock_waiting { __ticket_t want; }; -static DEFINE_PER_CPU(int, lock_kicker_irq) = -1; -static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting); static cpumask_t waiting_cpus; -static bool xen_pvspin = true; __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) { int irq = __this_cpu_read(lock_kicker_irq); @@ -213,6 +216,118 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) } } +#else /* CONFIG_QUEUE_SPINLOCK */ + +#ifdef CONFIG_XEN_DEBUG_FS +static u32 kick_nohlt_stats; /* Ki...

...+106,9 @@ struct xen_lock_waiting { __ticket_t want; }; -static DEFINE_PER_CPU(int, lock_kicker_irq) = -1; -static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting); static cpumask_t waiting_cpus; -static bool xen_pvspin = true; __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) { int irq = __this_cpu_read(lock_kicker_irq); @@ -213,6 +216,118 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) } } +#else /* CONFIG_QUEUE_SPINLOCK */ + +#ifdef CONFIG_XEN_DEBUG_FS +static u32 kick_nohlt_stats; /* Ki...

This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. The series provides implementation for both Xen and KVM. The current set of patches are for Xen/x86 spinlock/KVM guest side, to be included against -tip. I 'll be sending a separate patchset for KVM host based on kvm tree. Please note I have added the below performance result

This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. The series provides implementation for both Xen and KVM. The current set of patches are for Xen/x86 spinlock/KVM guest side, to be included against -tip. I 'll be sending a separate patchset for KVM host based on kvm tree. Please note I have added the below performance result

This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. The series provides implementation for both Xen and KVM. The current set of patches are for Xen/x86 spinlock/KVM guest side, to be included against -tip. I 'll be sending a separate patchset for KVM host based on kvm tree. Please note I have added the below performance result

...@@ static u8 zero_stats; static inline void check_zero(void) { u8 ret; - u8 old = ACCESS_ONCE(zero_stats); + u8 old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -112,6 +112,7 @@ __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) struct xen_lock_waiting *w = this_cpu_ptr(&lock_waiting); int cpu = smp_processor_id(); u64 start; + __ticket_t head; unsigned long flags; /* If kicker interrupts not initialized yet, just spin */ @@ -163,7 +164,8 @@ __visible void xen_lo...

...@@ static u8 zero_stats; static inline void check_zero(void) { u8 ret; - u8 old = ACCESS_ONCE(zero_stats); + u8 old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -112,6 +112,7 @@ __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) struct xen_lock_waiting *w = this_cpu_ptr(&lock_waiting); int cpu = smp_processor_id(); u64 start; + __ticket_t head; unsigned long flags; /* If kicker interrupts not initialized yet, just spin */ @@ -163,7 +164,8 @@ __visible void xen_lo...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Hi all, This series does two major things: 1. It converts the bulk of the implementation to C, and makes the "small ticket" and "large ticket" code common. Only the actual size-dependent asm instructions are specific to the ticket size. The resulting generated asm is very similar to the current

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Hi all, This series does two major things: 1. It converts the bulk of the implementation to C, and makes the "small ticket" and "large ticket" code common. Only the actual size-dependent asm instructions are specific to the ticket size. The resulting generated asm is very similar to the current

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Hi all, This series does two major things: 1. It converts the bulk of the implementation to C, and makes the "small ticket" and "large ticket" code common. Only the actual size-dependent asm instructions are specific to the ticket size. The resulting generated asm is very similar to the current