search for: qrwlock

...borntraeger at de.ibm.com> --- drivers/gpu/drm/i915/i915_gem_request.c | 2 +- drivers/vhost/net.c | 4 ++-- kernel/locking/mcs_spinlock.h | 4 ++-- kernel/locking/mutex.c | 4 ++-- kernel/locking/osq_lock.c | 6 +++--- kernel/locking/qrwlock.c | 6 +++--- kernel/locking/rwsem-xadd.c | 4 ++-- lib/lockref.c | 2 +- 8 files changed, 16 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 8832f8e..383d134 10...

...m/Kbuild b/arch/powerpc/include/asm/Kbuild index dadbcf3a0b1e..1dd8b6adff5e 100644 --- a/arch/powerpc/include/asm/Kbuild +++ b/arch/powerpc/include/asm/Kbuild @@ -6,5 +6,7 @@ generated-y += syscall_table_spu.h generic-y += export.h generic-y += local64.h generic-y += mcs_spinlock.h +generic-y += qrwlock.h +generic-y += qspinlock.h generic-y += vtime.h generic-y += early_ioremap.h diff --git a/arch/powerpc/include/asm/qspinlock.h b/arch/powerpc/include/asm/qspinlock.h new file mode 100644 index 000000000000..f84da77b6bb7 --- /dev/null +++ b/arch/powerpc/include/asm/qspinlock.h @@ -0,0 +1,20 @@ +/...

...m/Kbuild b/arch/powerpc/include/asm/Kbuild index dadbcf3a0b1e..1dd8b6adff5e 100644 --- a/arch/powerpc/include/asm/Kbuild +++ b/arch/powerpc/include/asm/Kbuild @@ -6,5 +6,7 @@ generated-y += syscall_table_spu.h generic-y += export.h generic-y += local64.h generic-y += mcs_spinlock.h +generic-y += qrwlock.h +generic-y += qspinlock.h generic-y += vtime.h generic-y += early_ioremap.h diff --git a/arch/powerpc/include/asm/qspinlock.h b/arch/powerpc/include/asm/qspinlock.h new file mode 100644 index 000000000000..c49e33e24edd --- /dev/null +++ b/arch/powerpc/include/asm/qspinlock.h @@ -0,0 +1,25 @@ +/...

...nclude/asm/processor.h | 2 +- drivers/gpu/drm/i915/i915_gem_request.c | 2 +- drivers/vhost/net.c | 4 ++-- kernel/locking/mcs_spinlock.h | 4 ++-- kernel/locking/mutex.c | 4 ++-- kernel/locking/osq_lock.c | 6 +++--- kernel/locking/qrwlock.c | 6 +++--- kernel/locking/rwsem-xadd.c | 4 ++-- kernel/stop_machine.c | 2 +- lib/lockref.c | 2 +- 42 files changed, 53 insertions(+), 53 deletions(-)

...nclude/asm/processor.h | 2 +- drivers/gpu/drm/i915/i915_gem_request.c | 2 +- drivers/vhost/net.c | 4 ++-- kernel/locking/mcs_spinlock.h | 4 ++-- kernel/locking/mutex.c | 4 ++-- kernel/locking/osq_lock.c | 6 +++--- kernel/locking/qrwlock.c | 6 +++--- kernel/locking/rwsem-xadd.c | 4 ++-- kernel/stop_machine.c | 2 +- lib/lockref.c | 2 +- 42 files changed, 53 insertions(+), 53 deletions(-)

...ld > index dadbcf3a0b1e..1dd8b6adff5e 100644 > --- a/arch/powerpc/include/asm/Kbuild > +++ b/arch/powerpc/include/asm/Kbuild > @@ -6,5 +6,7 @@ generated-y += syscall_table_spu.h > generic-y += export.h > generic-y += local64.h > generic-y += mcs_spinlock.h > +generic-y += qrwlock.h > +generic-y += qspinlock.h The 2nd line spits a warning about a redundant entry. I think you want to just drop it. cheers

...cpu); +} + #else #define pv_time_init() do {} while (0) diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h index b093b287babf..45ff1b2949a6 100644 --- a/arch/arm64/include/asm/spinlock.h +++ b/arch/arm64/include/asm/spinlock.h @@ -7,8 +7,15 @@ #include <asm/qrwlock.h> #include <asm/qspinlock.h> +#include <asm/paravirt.h> /* See include/linux/spinlock.h */ #define smp_mb__after_spinlock() smp_mb() +#define vcpu_is_preempted vcpu_is_preempted +static inline bool vcpu_is_preempted(long cpu) +{ + return pv_vcpu_is_preempted(cpu); +} + #endi...

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v2 is updated to account for feedback from Will, Peter, and Waiman (thank you), and trims off a couple of RFC and unrelated patches. Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued

Updated with everybody's feedback (thanks all), and more performance results. What I've found is I might have been measuring the worst load point for the paravirt case, and by looking at a range of loads it's clear that queued spinlocks are overall better even on PV, doubly so when you look at the generally much improved worst case latencies. I have defaulted it to N even though

This series adds an option to use queued spinlocks for powerpc, and makes it the default for the Book3S-64 subarch. This effort starts with the generic code so it's very simple but still very performant. There are optimisations that can be made to slowpaths, but I think it's better to attack those incrementally if/when we find things, and try to add the improvements to generic code as

This patch set aims to support the vcpu_is_preempted() functionality under KVM/arm64, which allowing the guest to obtain the VCPU is currently running or not. This will enhance lock performance on overcommitted hosts (more runnable VCPUs than physical CPUs in the system) as doing busy waits for preempted VCPUs will hurt system performance far worse than early yielding. We have observed some

From: Zengruan Ye <yezengruan at huawei.com> This patch set aims to support the vcpu_is_preempted() functionality under KVM/arm64, which allowing the guest to obtain the vcpu is currently running or not. This will enhance lock performance on overcommitted hosts (more runnable vcpus than physical cpus in the system) as doing busy waits for preempted vcpus will hurt system performance far

From: Zengruan Ye <yezengruan at huawei.com> This patch set aims to support the vcpu_is_preempted() functionality under KVM/arm64, which allowing the guest to obtain the vcpu is currently running or not. This will enhance lock performance on overcommitted hosts (more runnable vcpus than physical cpus in the system) as doing busy waits for preempted vcpus will hurt system performance far