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...00644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -63,6 +63,11 @@ */ struct qnode { struct mcs_spinlock mcs; +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS + int lsteal_mask; /* Lock stealing frequency mask */ + u32 prev_tail; /* Tail code of previous node */ + struct qnode *qprev; /* Previous queue node addr */ +#endif }; #define qhead mcs.locked /* The queue head flag */ @@ -215,6 +220,139 @@ xchg_tail(struct qspinlock *lock, u32 tail, u32 *pval) } #endif /* _Q_PENDING_BITS == 8 */ +/* + ************************************************************************ + *...

On Fri, May 09, 2014 at 09:08:56PM -0400, Waiman Long wrote: > On 05/08/2014 03:04 PM, Peter Zijlstra wrote: > >On Wed, May 07, 2014 at 11:01:36AM -0400, Waiman Long wrote: > >> /* > >>+ * To have additional features for better virtualization support, it is > >>+ * necessary to store additional data in the queue node structure. So > >>+ * a new queue

On Fri, May 09, 2014 at 09:08:56PM -0400, Waiman Long wrote: > On 05/08/2014 03:04 PM, Peter Zijlstra wrote: > >On Wed, May 07, 2014 at 11:01:36AM -0400, Waiman Long wrote: > >> /* > >>+ * To have additional features for better virtualization support, it is > >>+ * necessary to store additional data in the queue node structure. So > >>+ * a new queue

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

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

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit