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...to split this in the header file as this is trying to not be a slowpath code - but rather - a pre-slow-path-lets-try-if-we can do another cmpxchg in case the unlocker has just unlocked itself. So something like: diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h index e8a7ae8..29cc9c7 100644 --- a/include/asm-generic/qspinlock.h +++ b/include/asm-generic/qspinlock.h @@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); */ static __always_inline void queue_spin_lock(struct qspinlock *lock) { - u32 val; + u32 val, new; val = at...

...to split this in the header file as this is trying to not be a slowpath code - but rather - a pre-slow-path-lets-try-if-we can do another cmpxchg in case the unlocker has just unlocked itself. So something like: diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h index e8a7ae8..29cc9c7 100644 --- a/include/asm-generic/qspinlock.h +++ b/include/asm-generic/qspinlock.h @@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); */ static __always_inline void queue_spin_lock(struct qspinlock *lock) { - u32 val; + u32 val, new; val = at...

...slowpath code - but rather - a > >pre-slow-path-lets-try-if-we can do another cmpxchg in case > >the unlocker has just unlocked itself. > > > >So something like: > > > >diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h > >index e8a7ae8..29cc9c7 100644 > >--- a/include/asm-generic/qspinlock.h > >+++ b/include/asm-generic/qspinlock.h > >@@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); > > */ > > static __always_inline void queue_spin_lock(struct qspinlock *l...

...slowpath code - but rather - a > >pre-slow-path-lets-try-if-we can do another cmpxchg in case > >the unlocker has just unlocked itself. > > > >So something like: > > > >diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h > >index e8a7ae8..29cc9c7 100644 > >--- a/include/asm-generic/qspinlock.h > >+++ b/include/asm-generic/qspinlock.h > >@@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); > > */ > > static __always_inline void queue_spin_lock(struct qspinlock *l...

...as this is trying to not be a slowpath code - but rather - a > pre-slow-path-lets-try-if-we can do another cmpxchg in case > the unlocker has just unlocked itself. > > So something like: > > diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h > index e8a7ae8..29cc9c7 100644 > --- a/include/asm-generic/qspinlock.h > +++ b/include/asm-generic/qspinlock.h > @@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); > */ > static __always_inline void queue_spin_lock(struct qspinlock *lock) > { > -...

...; > >pre-slow-path-lets-try-if-we can do another cmpxchg in case > > >the unlocker has just unlocked itself. > > > > > >So something like: > > > > > >diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h > > >index e8a7ae8..29cc9c7 100644 > > >--- a/include/asm-generic/qspinlock.h > > >+++ b/include/asm-generic/qspinlock.h > > >@@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); > > > */ > > > static __always_inline void queue_spin...

...er cmpxchg in case > >>>> the unlocker has just unlocked itself. > >>>> > >>>> So something like: > >>>> > >>>> diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h > >>>> index e8a7ae8..29cc9c7 100644 > >>>> --- a/include/asm-generic/qspinlock.h > >>>> +++ b/include/asm-generic/qspinlock.h > >>>> @@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); > >>>>??? */ > >>>...

...er cmpxchg in case > >>>> the unlocker has just unlocked itself. > >>>> > >>>> So something like: > >>>> > >>>> diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h > >>>> index e8a7ae8..29cc9c7 100644 > >>>> --- a/include/asm-generic/qspinlock.h > >>>> +++ b/include/asm-generic/qspinlock.h > >>>> @@ -75,11 +75,21 @@ extern void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val); > >>>>??? */ > >>>...

v11->v12: - Based on PeterZ's version of the qspinlock patch (https://lkml.org/lkml/2014/6/15/63). - Incorporated many of the review comments from Konrad Wilk and Paolo Bonzini. - The pvqspinlock code is largely from my previous version with PeterZ's way of going from queue tail to head and his idea of using callee saved calls to KVM and XEN codes. v10->v11: - Use a

v11->v12: - Based on PeterZ's version of the qspinlock patch (https://lkml.org/lkml/2014/6/15/63). - Incorporated many of the review comments from Konrad Wilk and Paolo Bonzini. - The pvqspinlock code is largely from my previous version with PeterZ's way of going from queue tail to head and his idea of using callee saved calls to KVM and XEN codes. v10->v11: - Use a

v12->v13: - Change patch 9 to generate separate versions of the queue_spin_lock_slowpath functions for bare metal and PV guest. This reduces the performance impact of the PV code on bare metal systems. v11->v12: - Based on PeterZ's version of the qspinlock patch (https://lkml.org/lkml/2014/6/15/63). - Incorporated many of the review comments from Konrad Wilk and Paolo

v12->v13: - Change patch 9 to generate separate versions of the queue_spin_lock_slowpath functions for bare metal and PV guest. This reduces the performance impact of the PV code on bare metal systems. v11->v12: - Based on PeterZ's version of the qspinlock patch (https://lkml.org/lkml/2014/6/15/63). - Incorporated many of the review comments from Konrad Wilk and Paolo

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

v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex patches into smaller ones to ease review effort. - Fix a racing condition in the PV qspinlock code. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving

v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex patches into smaller ones to ease review effort. - Fix a racing condition in the PV qspinlock code. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving

v9->v10: - Make some minor changes to qspinlock.c to accommodate review feedback. - Change author to PeterZ for 2 of the patches. - Include Raghavendra KT's test results in patch 18. v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex

v9->v10: - Make some minor changes to qspinlock.c to accommodate review feedback. - Change author to PeterZ for 2 of the patches. - Include Raghavendra KT's test results in patch 18. v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex