search for: zero_stat

On 15/02/15 17:30, Raghavendra K T wrote: > --- a/arch/x86/xen/spinlock.c > +++ b/arch/x86/xen/spinlock.c > @@ -41,7 +41,7 @@ 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 +1...

On 15/02/15 17:30, Raghavendra K T wrote: > --- a/arch/x86/xen/spinlock.c > +++ b/arch/x86/xen/spinlock.c > @@ -41,7 +41,7 @@ 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 +1...

...kets_equal(tmp.head, head)) break; cpu_relax(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 94f6434..9c6c8cf 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -609,7 +609,7 @@ static inline void check_zero(void) u8 ret; u8 old; - old = ACCESS_ONCE(zero_stats); + old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -727,6 +727,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) int cpu; u64 start; unsigned long flags;...

...kets_equal(tmp.head, head)) break; cpu_relax(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 94f6434..9c6c8cf 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -609,7 +609,7 @@ static inline void check_zero(void) u8 ret; u8 old; - old = ACCESS_ONCE(zero_stats); + old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -727,6 +727,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) int cpu; u64 start; unsigned long flags;...

...kets_equal(tmp.head, head)) break; cpu_relax(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 94f6434..e354cc6 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -609,7 +609,7 @@ static inline void check_zero(void) u8 ret; u8 old; - old = ACCESS_ONCE(zero_stats); + old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -727,6 +727,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) int cpu; u64 start; unsigned long flags;...

...kets_equal(tmp.head, head)) break; cpu_relax(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 94f6434..e354cc6 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -609,7 +609,7 @@ static inline void check_zero(void) u8 ret; u8 old; - old = ACCESS_ONCE(zero_stats); + old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -727,6 +727,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) int cpu; u64 start; unsigned long flags;...

...kets_equal(tmp.head, head)) break; cpu_relax(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 94f6434..9c6c8cf 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -609,7 +609,7 @@ static inline void check_zero(void) u8 ret; u8 old; - old = ACCESS_ONCE(zero_stats); + old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -727,6 +727,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) int cpu; u64 start; unsigned long flags;...

...kets_equal(tmp.head, head)) break; cpu_relax(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 94f6434..9c6c8cf 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -609,7 +609,7 @@ static inline void check_zero(void) u8 ret; u8 old; - old = ACCESS_ONCE(zero_stats); + old = READ_ONCE(zero_stats); if (unlikely(old)) { ret = cmpxchg(&zero_stats, old, 0); /* This ensures only one fellow resets the stat */ @@ -727,6 +727,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) int cpu; u64 start; unsigned long flags;...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...pinning = PV_CALLEE_SAVE(xen_lock_spinning); pv_lock_ops.unlock_kick = xen_unlock_kick; +#endif } /* @@ -318,6 +414,7 @@ static int __init xen_spinlock_debugfs(void) d_spin_debug = debugfs_create_dir("spinlocks", d_xen); +#ifndef CONFIG_QUEUE_SPINLOCK debugfs_create_u8("zero_stats", 0644, d_spin_debug, &zero_stats); debugfs_create_u32("taken_slow", 0444, d_spin_debug, @@ -337,7 +434,19 @@ static int __init xen_spinlock_debugfs(void) debugfs_create_u32_array("histo_blocked", 0444, d_spin_debug, spinlock_stats.histo_spin_blocked, HIST...

...pinning = PV_CALLEE_SAVE(xen_lock_spinning); pv_lock_ops.unlock_kick = xen_unlock_kick; +#endif } /* @@ -321,6 +444,7 @@ static int __init xen_spinlock_debugfs(void) d_spin_debug = debugfs_create_dir("spinlocks", d_xen); +#ifndef CONFIG_QUEUE_SPINLOCK debugfs_create_u8("zero_stats", 0644, d_spin_debug, &zero_stats); debugfs_create_u32("taken_slow", 0444, d_spin_debug, @@ -340,7 +464,22 @@ static int __init xen_spinlock_debugfs(void) debugfs_create_u32_array("histo_blocked", 0444, d_spin_debug, spinlock_stats.histo_spin_blocked, HIST...

...pinning = PV_CALLEE_SAVE(xen_lock_spinning); pv_lock_ops.unlock_kick = xen_unlock_kick; +#endif } /* @@ -321,6 +444,7 @@ static int __init xen_spinlock_debugfs(void) d_spin_debug = debugfs_create_dir("spinlocks", d_xen); +#ifndef CONFIG_QUEUE_SPINLOCK debugfs_create_u8("zero_stats", 0644, d_spin_debug, &zero_stats); debugfs_create_u32("taken_slow", 0444, d_spin_debug, @@ -340,7 +464,22 @@ static int __init xen_spinlock_debugfs(void) debugfs_create_u32_array("histo_blocked", 0444, d_spin_debug, spinlock_stats.histo_spin_blocked, HIST...

...ocklock (https://lkml.org/lkml/2011/10/12/496). Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...ocklock (https://lkml.org/lkml/2011/10/12/496). Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...

...needed kvm_guest_init for !CONFIG_KVM_GUEST case Changes in V3: - rebased to 3.2-rc1 - use halt() instead of wait for kick hypercall. - modify kick hyper call to do wakeup halted vcpu. - hook kvm_spinlock_init to smp_prepare_cpus call (moved the call out of head##.c). - fix the potential race when zero_stat is read. - export debugfs_create_32 and add documentation to API. - use static inline and enum instead of ADDSTAT macro. - add barrier() in after setting kick_vcpu. - empty static inline function for kvm_spinlock_init. - combine the patches one and two readuce overhead. - make KVM_DEBUGFS depends...