On 11/17/2010 02:34 AM, Jan Beulich wrote:
>> Actually, on second thoughts, maybe it doesn't matter so much. The main
>> issue is making sure that the interrupt will make the VCPU drop out of
>> xen_poll_irq() - if it happens before xen_poll_irq(), it should leave
>> the event pending, which will
>>> On 17.11.10 at 10:57, Jeremy Fitzhardinge wrote:
> On 11/17/2010 12:52 AM, Jeremy Fitzhardinge wrote:
>> On 11/17/2010 12:11 AM, Jan Beulich wrote:
>> On 16.11.10 at 22:08, Jeremy Fitzhardinge wrote:
+static void xen_lock_spinning(struct arch_spinlock *lock, unsigned want)
{
>>
On 11/17/2010 12:52 AM, Jeremy Fitzhardinge wrote:
> On 11/17/2010 12:11 AM, Jan Beulich wrote:
> On 16.11.10 at 22:08, Jeremy Fitzhardinge wrote:
>>> +static void xen_lock_spinning(struct arch_spinlock *lock, unsigned want)
>>> {
>>> - struct xen_spinlock *xl = (struct xen_spinlock *)lock;
On 11/17/2010 12:11 AM, Jan Beulich wrote:
On 16.11.10 at 22:08, Jeremy Fitzhardinge wrote:
>> +static void xen_lock_spinning(struct arch_spinlock *lock, unsigned want)
>> {
>> -struct xen_spinlock *xl = (struct xen_spinlock *)lock;
>> -struct xen_spinlock *prev;
>> int irq = __
>>> On 16.11.10 at 22:08, Jeremy Fitzhardinge wrote:
> +static void xen_lock_spinning(struct arch_spinlock *lock, unsigned want)
> {
> - struct xen_spinlock *xl = (struct xen_spinlock *)lock;
> - struct xen_spinlock *prev;
> int irq = __get_cpu_var(lock_kicker_irq);
> - int ret;
From: Jeremy Fitzhardinge
Replace the old Xen implementation of PV spinlocks with and implementation
of xen_lock_spinning and xen_unlock_kick.
xen_lock_spinning simply registers the cpu in its entry in lock_waiting,
adds itself to the waiting_cpus set, and blocks on an event channel
until the ch
