search for: qspinlock_halt

Displaying 3 results from an estimated 3 matches for "qspinlock_halt".

Did you mean: qspinlock_halted
2014 Feb 27
0
[PATCH RFC v5 7/8] pvqspinlock, x86: Add qspinlock para-virtualization support
...lock_lock hooks. The x86-specific codepath can use bit 1 in the ->wait byte as "I have halted, please kick me". value = _QSPINLOCK_WAITING; i = 0; do cpu_relax(); while (ACCESS_ONCE(slock->lock) && i++ < BUSY_WAIT); if (ACCESS_ONCE(slock->lock)) { value |= _QSPINLOCK_HALTED; xchg(&slock->wait, value >> 8); if (ACCESS_ONCE(slock->lock)) { ... call lock_spinning hook ... } } /* * Set the lock bit & clear the halted+waiting bits */ if (cmpxchg(&slock->lock_wait, value, _QSPINLOCK_LOCKED) == value) return -1; /* Got th...
2014 Feb 27
3
[PATCH RFC v5 7/8] pvqspinlock, x86: Add qspinlock para-virtualization support
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
2014 Feb 27
3
[PATCH RFC v5 7/8] pvqspinlock, x86: Add qspinlock para-virtualization support
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