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...state. PV state data is kept 1 cacheline ahead of the regular data. - link_and_wait_node; this replaces the regular MCS queuing code. CPU halting can happen if the wait is too long. - wait_head; this waits until the lock is avialable and the CPU will be halted if the wait is too long. - wait_check; this is called after acquiring the lock to see if the next queue head CPU is halted. If this is the case, the lock bit is changed to indicate the queue head will have to be kicked on unlock. - queue_unlock; this routine has a jump label to check if paravirt is enabled. If yes, it has t...

...state. PV state data is kept 1 cacheline ahead of the regular data. - link_and_wait_node; this replaces the regular MCS queuing code. CPU halting can happen if the wait is too long. - wait_head; this waits until the lock is avialable and the CPU will be halted if the wait is too long. - wait_check; this is called after acquiring the lock to see if the next queue head CPU is halted. If this is the case, the lock bit is changed to indicate the queue head will have to be kicked on unlock. - queue_unlock; this routine has a jump label to check if paravirt is enabled. If yes, it has t...

...state. PV state data is kept 1 cacheline ahead of the regular data. - link_and_wait_node; this replaces the regular MCS queuing code. CPU halting can happen if the wait is too long. - wait_head; this waits until the lock is avialable and the CPU will be halted if the wait is too long. - wait_check; this is called after acquiring the lock to see if the next queue head CPU is halted. If this is the case, the lock bit is changed to indicate the queue head will have to be kicked on unlock. - queue_unlock; this routine has a jump label to check if paravirt is enabled. If yes, it has t...

...state. PV state data is kept 1 cacheline ahead of the regular data. - link_and_wait_node; this replaces the regular MCS queuing code. CPU halting can happen if the wait is too long. - wait_head; this waits until the lock is avialable and the CPU will be halted if the wait is too long. - wait_check; this is called after acquiring the lock to see if the next queue head CPU is halted. If this is the case, the lock bit is changed to indicate the queue head will have to be kicked on unlock. - queue_unlock; this routine has a jump label to check if paravirt is enabled. If yes, it has t...

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

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

v13->v14: - Patches 1 & 2: Add queue_spin_unlock_wait() to accommodate commit 78bff1c86 from Oleg Nesterov. - Fix the system hang problem when using PV qspinlock in an over-committed guest due to a racing condition in the pv_set_head_in_tail() function. - Increase the MAYHALT_THRESHOLD from 10 to 1024. - Change kick_cpu into a regular function pointer instead of a

v13->v14: - Patches 1 & 2: Add queue_spin_unlock_wait() to accommodate commit 78bff1c86 from Oleg Nesterov. - Fix the system hang problem when using PV qspinlock in an over-committed guest due to a racing condition in the pv_set_head_in_tail() function. - Increase the MAYHALT_THRESHOLD from 10 to 1024. - Change kick_cpu into a regular function pointer instead of a