[Xen-devel] [RFC]PLE's performance enhancement through improving scheduler.

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

The attached patch is just for RFC, not for check-in. Recently, we are working 
on enhancing the hardware feature PLE through improving scheduler in Xen, and 
the attached patch can improve system's throughput significantly. With standand 
virtualization benchmark(vConsolidate), the testing result shows  ~20% 
performance gain.   In the implemenation, there are two points to enhance the 
system's scheduler. 
The first one is that when PLE vmexit occurs,  scheduler de-schedules the vcpu 
and put it in the second position of the runq instead of moving it to the tail 
of runq so that it can be re-scheduled in a very short time. In this case, it  
can improve scheduler's faireness and make the PLE-senstive guests allocated 
with reasonable timeslice.  The other improvement is to boost other vcpus' 
priority of the same guest through moving them to the head of the runq when PLE 
vmexit happens with one vcpu of the guest.  And we are also improving the 
implementation to make it more robust and more pervasive, but before the work 
is done, we also want to collect your guys' ideas and suggestions about it ?  
Any comment is very appreciated!. Thanks! 
Xiantao

sched-ple.patch
Description: sched-ple.patch

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