Re: [Xen-devel] [v3 12/15] vmx: posted-interrupt handling when vCPU is blocked

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.07.15 at 12:36, <feng.wu@xxxxxxxxx> wrote:
>> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
>> Sent: Tuesday, June 30, 2015 1:07 AM
>> On 24/06/15 06:18, Feng Wu wrote:
>> > @@ -148,11 +161,19 @@ static int vmx_vcpu_initialise(struct vcpu *v)
>> >      if ( v->vcpu_id == 0 )
>> >          v->arch.user_regs.eax = 1;
>> >
>> > +    tasklet_init(
>> > +        &v->arch.hvm_vmx.pi_vcpu_wakeup_tasklet,
>> > +        pi_vcpu_wakeup_tasklet_handler,
>> > +        (unsigned long)v);
>> 
>> c/s f6dd295 indicates that the global tasklet lock causes a bottleneck
>> when injecting interrupts, and replaced a tasklet with a softirq to fix
>> the scalability issue.
>> 
>> I would expect exactly the bottleneck to exist here.
> 
> I am still considering this comments. Jan, what is your opinion about this?

"My opinion" here is that I expect you to respond to Andrew.

Jan


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