Re: [PATCH RFC 1/2] kvm vcpu: Note down pause loop exit

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On 07/12/2012 04:28 PM, Nikunj A Dadhania wrote:
On Wed, 11 Jul 2012 16:22:29 +0530, Raghavendra K T<raghavendra.kt@xxxxxxxxxxxxxxxxxx>  wrote:
On 07/11/2012 02:23 PM, Avi Kivity wrote:

This adds some tiny overhead to vcpu entry.  You could remove it by
using the vcpu->requests mechanism to clear the flag, since
vcpu->requests is already checked on every entry.

So IIUC,  let's have request bit for indicating PLE,

pause_interception() /handle_pause()
{
   make_request(PLE_REQUEST)
   vcpu_on_spin()

}

check_eligibility()
   {
   !test_request(PLE_REQUEST) || ( test_request(PLE_REQUEST)&&
dy_eligible())
.
.
}

vcpu_run()
{

check_request(PLE_REQUEST)

I know check_request will clear PLE_REQUEST, but you just need a
clear_request here, right?


Yes. tried to use check_request for clearing. But I ended up in
different implementation. (latest thread)


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