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...k && - ACCESS_ONCE(w->want) == ticket) { + (ACCESS_ONCE(w->want) & TICKET_BATCH_MASK) == + (ticket & TICKET_BATCH_MASK)) { add_stats(RELEASED_SLOW_KICKED, 1); kvm_kick_cpu(cpu); break; diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index 0ba5f3b..8d83510 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -163,7 +163,8 @@ __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) * check again make sure it didn't become free while * we weren't looking */ - if (ACCESS_ONCE(lock->ticke...

...k && - ACCESS_ONCE(w->want) == ticket) { + (ACCESS_ONCE(w->want) & TICKET_BATCH_MASK) == + (ticket & TICKET_BATCH_MASK)) { add_stats(RELEASED_SLOW_KICKED, 1); kvm_kick_cpu(cpu); break; diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index 0ba5f3b..8d83510 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -163,7 +163,8 @@ __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) * check again make sure it didn't become free while * we weren't looking */ - if (ACCESS_ONCE(lock->ticke...

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

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

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