search for: fc7fd8c

On Fri, May 30, 2014 at 11:43:52AM -0400, Waiman Long wrote: > --- > kernel/locking/qspinlock.c | 18 ++++++++++++++++-- > 1 files changed, 16 insertions(+), 2 deletions(-) > > diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c > index fc7fd8c..7f10758 100644 > --- a/kernel/locking/qspinlock.c > +++ b/kernel/locking/qspinlock.c > @@ -233,11 +233,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val) > */ > for (;;) { > /* > - * If we observe any contention; queue. > + * If we observe that...

On Fri, May 30, 2014 at 11:43:52AM -0400, Waiman Long wrote: > --- > kernel/locking/qspinlock.c | 18 ++++++++++++++++-- > 1 files changed, 16 insertions(+), 2 deletions(-) > > diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c > index fc7fd8c..7f10758 100644 > --- a/kernel/locking/qspinlock.c > +++ b/kernel/locking/qspinlock.c > @@ -233,11 +233,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val) > */ > for (;;) { > /* > - * If we observe any contention; queue. > + * If we observe that...

...n Fri, May 30, 2014 at 11:43:52AM -0400, Waiman Long wrote: >> --- >> kernel/locking/qspinlock.c | 18 ++++++++++++++++-- >> 1 files changed, 16 insertions(+), 2 deletions(-) >> >> diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c >> index fc7fd8c..7f10758 100644 >> --- a/kernel/locking/qspinlock.c >> +++ b/kernel/locking/qspinlock.c >> @@ -233,11 +233,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val) >> */ >> for (;;) { >> /* >> - * If we observe any contention; queue...

...owever, the ticket spinlock is still quite a bit faster. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- kernel/locking/qspinlock.c | 18 ++++++++++++++++-- 1 files changed, 16 insertions(+), 2 deletions(-) diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index fc7fd8c..7f10758 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -233,11 +233,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val) */ for (;;) { /* - * If we observe any contention; queue. + * If we observe that the queue is not empty or both + * th...

...atomic_t *v) } #endif /* #ifndef CONFIG_ARCH_HAS_ATOMIC_OR */ +#define atomic_read_raw(v) (v.counter) + #include <asm-generic/atomic-long.h> #ifdef CONFIG_GENERIC_ATOMIC64 #include <asm-generic/atomic64.h> diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index fc7fd8c..2833fe1 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -265,7 +265,7 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val) * sequentiality; this because not all clear_pending_set_locked() * implementations imply full barriers. */ - while ((val = sm...

...atomic_t *v) } #endif /* #ifndef CONFIG_ARCH_HAS_ATOMIC_OR */ +#define atomic_read_raw(v) (v.counter) + #include <asm-generic/atomic-long.h> #ifdef CONFIG_GENERIC_ATOMIC64 #include <asm-generic/atomic64.h> diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index fc7fd8c..2833fe1 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -265,7 +265,7 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val) * sequentiality; this because not all clear_pending_set_locked() * implementations imply full barriers. */ - while ((val = sm...

v10->v11: - Use a simple test-and-set unfair lock to simplify the code, but performance may suffer a bit for large guest with many CPUs. - Take out Raghavendra KT's test results as the unfair lock changes may render some of his results invalid. - Add PV support without increasing the size of the core queue node structure. - Other minor changes to address some of the

v10->v11: - Use a simple test-and-set unfair lock to simplify the code, but performance may suffer a bit for large guest with many CPUs. - Take out Raghavendra KT's test results as the unfair lock changes may render some of his results invalid. - Add PV support without increasing the size of the core queue node structure. - Other minor changes to address some of the

Since Waiman seems incapable of doing simple things; here's my take on the paravirt crap. The first few patches are taken from Waiman's latest series, but the virt support is completely new. Its primary aim is to not mess up the native code. I've not stress tested it, but the virt and paravirt (kvm) cases boot on simple smp guests. I've not done Xen, but the patch should be

Since Waiman seems incapable of doing simple things; here's my take on the paravirt crap. The first few patches are taken from Waiman's latest series, but the virt support is completely new. Its primary aim is to not mess up the native code. I've not stress tested it, but the virt and paravirt (kvm) cases boot on simple smp guests. I've not done Xen, but the patch should be