search for: pvticketlock

On 02/27/2014 08:15 PM, Paolo Bonzini wrote: [...] >> But neither of the VCPUs being kicked here are halted -- they're either >> running or runnable (descheduled by the hypervisor). > > /me actually looks at Waiman's code... > > Right, this is really different from pvticketlocks, where the *unlock* > primitive wakes up a sleeping VCPU. It is more similar to PLE > (pause-loop exiting). Adding to the discussion, I see there are two possibilities here, considering that in undercommit cases we should not exceed HEAD_SPIN_THRESHOLD, 1. the looping vcpu in pv_head_spin...

On 02/27/2014 08:15 PM, Paolo Bonzini wrote: [...] >> But neither of the VCPUs being kicked here are halted -- they're either >> running or runnable (descheduled by the hypervisor). > > /me actually looks at Waiman's code... > > Right, this is really different from pvticketlocks, where the *unlock* > primitive wakes up a sleeping VCPU. It is more similar to PLE > (pause-loop exiting). Adding to the discussion, I see there are two possibilities here, considering that in undercommit cases we should not exceed HEAD_SPIN_THRESHOLD, 1. the looping vcpu in pv_head_spin...

...htforward aside from requiring a "lock add". Andrew Jones (1): jump_label: Split jumplabel ratelimit Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketl...

...htforward aside from requiring a "lock add". Andrew Jones (1): jump_label: Split jumplabel ratelimit Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketl...

...htforward aside from requiring a "lock add". Andrew Jones (1): jump_label: Split jumplabel ratelimit Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketl...

On 27/02/14 13:11, Paolo Bonzini wrote: > Il 27/02/2014 13:11, David Vrabel ha scritto: >>> > This patch adds para-virtualization support to the queue spinlock code >>> > by enabling the queue head to kick the lock holder CPU, if known, >>> > in when the lock isn't released for a certain amount of time. It >>> > also enables the mutual

On 27/02/14 13:11, Paolo Bonzini wrote: > Il 27/02/2014 13:11, David Vrabel ha scritto: >>> > This patch adds para-virtualization support to the queue spinlock code >>> > by enabling the queue head to kick the lock holder CPU, if known, >>> > in when the lock isn't released for a certain amount of time. It >>> > also enables the mutual

...nes and overall performance of non-PLE machines. The older series was tested by Attilio for Xen implementation [1]. Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...nes and overall performance of non-PLE machines. The older series was tested by Attilio for Xen implementation [1]. Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...nes and overall performance of non-PLE machines. The older series was tested by Attilio for Xen implementation [1]. Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...lo Bonzini wrote: > [...] >>> But neither of the VCPUs being kicked here are halted -- they're either >>> running or runnable (descheduled by the hypervisor). >> >> /me actually looks at Waiman's code... >> >> Right, this is really different from pvticketlocks, where the *unlock* >> primitive wakes up a sleeping VCPU. It is more similar to PLE >> (pause-loop exiting). > > Adding to the discussion, I see there are two possibilities here, > considering that in undercommit cases we should not exceed > HEAD_SPIN_THRESHOLD, > >...

...results: https://lkml.org/lkml/2012/3/23/50 https://lkml.org/lkml/2012/4/5/73 Thoughts? Comments? Suggestions? Jeremy Fitzhardinge (9): x86/spinlock: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen: defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: use callee-save for lock_spinning x86/pvticketlock: when paravirtualizing ticket locks, increment by 2 x86/ticketlock: add slowpath logic xen/pvticketl...

...results: https://lkml.org/lkml/2012/3/23/50 https://lkml.org/lkml/2012/4/5/73 Thoughts? Comments? Suggestions? Jeremy Fitzhardinge (9): x86/spinlock: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen: defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: use callee-save for lock_spinning x86/pvticketlock: when paravirtualizing ticket locks, increment by 2 x86/ticketlock: add slowpath logic xen/pvticketl...

...a 5-byte nop added to it, and the PV case is reasonable straightforward aside from requiring a "lock add". Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...a 5-byte nop added to it, and the PV case is reasonable straightforward aside from requiring a "lock add". Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...a 5-byte nop added to it, and the PV case is reasonable straightforward aside from requiring a "lock add". Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...ines and overall performance of non-PLE machines. The older series[2] was tested by Attilio for Xen implementation. Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...ines and overall performance of non-PLE machines. The older series[2] was tested by Attilio for Xen implementation. Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...ines and overall performance of non-PLE machines. The older series[2] was tested by Attilio for Xen implementation. Jeremy Fitzhardinge (9): x86/spinlock: Replace pv spinlocks with pv ticketlocks x86/ticketlock: Collapse a layer of functions xen: Defer spinlock setup until boot CPU setup xen/pvticketlock: Xen implementation for PV ticket locks xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks x86/pvticketlock: Use callee-save for lock_spinning x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 x86/ticketlock: Add slowpath logic xen/pvticketlock: Allo...

...CPU of its choice, >> see Documentation/virtual/kvm/hypercalls.txt. > > But neither of the VCPUs being kicked here are halted -- they're either > running or runnable (descheduled by the hypervisor). /me actually looks at Waiman's code... Right, this is really different from pvticketlocks, where the *unlock* primitive wakes up a sleeping VCPU. It is more similar to PLE (pause-loop exiting). Paolo