search for: cf87de3

...e macro. Signed-off-by: Juergen Gross <jgross at suse.com> --- arch/x86/include/asm/spinlock.h | 3 ++- arch/x86/include/asm/spinlock_types.h | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h index cf87de3..8ceec8d 100644 --- a/arch/x86/include/asm/spinlock.h +++ b/arch/x86/include/asm/spinlock.h @@ -46,7 +46,8 @@ static __always_inline bool static_key_false(struct static_key *key); static inline void __ticket_enter_slowpath(arch_spinlock_t *lock) { - set_bit(0, (volatile unsigned long *)&loc...

...-+-----------+------------+-----------+ (here is the result I got from the patches, I believe there may be some small overhead from xadd etc, but overall looks fine but a thorough test may be needed) diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h index 625660f..cf87de3 100644 --- a/arch/x86/include/asm/spinlock.h +++ b/arch/x86/include/asm/spinlock.h @@ -46,7 +46,7 @@ static __always_inline bool static_key_false(struct static_key *key); static inline void __ticket_enter_slowpath(arch_spinlock_t *lock) { - set_bit(0, (volatile unsigned long *)&lock->tic...

...-+-----------+------------+-----------+ (here is the result I got from the patches, I believe there may be some small overhead from xadd etc, but overall looks fine but a thorough test may be needed) diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h index 625660f..cf87de3 100644 --- a/arch/x86/include/asm/spinlock.h +++ b/arch/x86/include/asm/spinlock.h @@ -46,7 +46,7 @@ static __always_inline bool static_key_false(struct static_key *key); static inline void __ticket_enter_slowpath(arch_spinlock_t *lock) { - set_bit(0, (volatile unsigned long *)&lock->tic...

...----------+-----------+ 1x 7029.9188 2.5952 6905.0712 4.4737 -1.77595 2x 3254.2075 14.8291 3233.7137 26.8784 -0.62976 +-----------+-----------+-----------+------------+-----------+ diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h index 625660f..cf87de3 100644 --- a/arch/x86/include/asm/spinlock.h +++ b/arch/x86/include/asm/spinlock.h @@ -46,7 +46,7 @@ static __always_inline bool static_key_false(struct static_key *key); static inline void __ticket_enter_slowpath(arch_spinlock_t *lock) { - set_bit(0, (volatile unsigned long *)&lock->tic...

...----------+-----------+ 1x 7029.9188 2.5952 6905.0712 4.4737 -1.77595 2x 3254.2075 14.8291 3233.7137 26.8784 -0.62976 +-----------+-----------+-----------+------------+-----------+ diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h index 625660f..cf87de3 100644 --- a/arch/x86/include/asm/spinlock.h +++ b/arch/x86/include/asm/spinlock.h @@ -46,7 +46,7 @@ static __always_inline bool static_key_false(struct static_key *key); static inline void __ticket_enter_slowpath(arch_spinlock_t *lock) { - set_bit(0, (volatile unsigned long *)&lock->tic...

Paravirtualized spinlocks produce some overhead even if the kernel is running on bare metal. The main reason are the more complex locking and unlocking functions. Especially unlocking is no longer just one instruction but so complex that it is no longer inlined. This patch series addresses this issue by adding two more pvops functions to reduce the size of the inlined spinlock functions. When

Paravirtualized spinlocks produce some overhead even if the kernel is running on bare metal. The main reason are the more complex locking and unlocking functions. Especially unlocking is no longer just one instruction but so complex that it is no longer inlined. This patch series addresses this issue by adding two more pvops functions to reduce the size of the inlined spinlock functions. When

Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOWPATH_FLAG)) __ticket_unlock_slowpath(lock, prev); which is

Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOWPATH_FLAG)) __ticket_unlock_slowpath(lock, prev); which is

v14->v15: - Incorporate PeterZ's v15 qspinlock patch and improve upon the PV qspinlock code by dynamically allocating the hash table as well as some other performance optimization. - Simplified the Xen PV qspinlock code as suggested by David Vrabel <david.vrabel at citrix.com>. - Add benchmarking data for 3.19 kernel to compare the performance of a spinlock heavy test

v14->v15: - Incorporate PeterZ's v15 qspinlock patch and improve upon the PV qspinlock code by dynamically allocating the hash table as well as some other performance optimization. - Simplified the Xen PV qspinlock code as suggested by David Vrabel <david.vrabel at citrix.com>. - Add benchmarking data for 3.19 kernel to compare the performance of a spinlock heavy test

v15->v16: - Remove the lfsr patch and use linear probing as lfsr is not really necessary in most cases. - Move the paravirt PV_CALLEE_SAVE_REGS_THUNK code to an asm header. - Add a patch to collect PV qspinlock statistics which also supersedes the PV lock hash debug patch. - Add PV qspinlock performance numbers. v14->v15: - Incorporate PeterZ's v15 qspinlock patch and improve

v15->v16: - Remove the lfsr patch and use linear probing as lfsr is not really necessary in most cases. - Move the paravirt PV_CALLEE_SAVE_REGS_THUNK code to an asm header. - Add a patch to collect PV qspinlock statistics which also supersedes the PV lock hash debug patch. - Add PV qspinlock performance numbers. v14->v15: - Incorporate PeterZ's v15 qspinlock patch and improve