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hv: sched_bvt: add BVT scheduler

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BVT (Borrowed virtual time) scheduler is used to schedule vCPUs on pCPU.
It has the concept of virtual time, vCPU with earliset virtual time is
dispatched first.

Main concepts:

tick timer:
    a period tick is used to measure the physcial time in units of MCU
    (minimum charing unit).
runqueue:
    thread in the runqueue is ordered by virtual time.
weight:
    each thread receives a share of the pCPU in proportion to its
    weight.
context switch allowance:
    the physcial time by which the current thread is allowed to advance
    beyond the next runnable thread.
warp:
    a thread with warp enabled will have a change to minus a value (Wi)
    from virtual time to achieve higher priority.
virtual time:
    AVT: actual virtual time, advance in proportional to weight.
    EVT: effective virtual time.
         EVT <- AVT - ( warp ? Wi : 0 )
    SVT: scheduler virtual time, the minimum AVT in the runqueue.

Tracked-On: #4410

Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Conghui Chen
2020-02-05 14:51:43 +00:00
committed by wenlingz
parent 64b874ce4c
commit a7563cb9bd
6 changed files with 89 additions and 0 deletions
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1
hypervisor/include/arch/x86/per_cpu.h
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@@ -39,6 +39,7 @@ struct per_cpu_region {
struct sched_control sched_ctl;
struct sched_noop_control sched_noop_ctl;
struct sched_iorr_control sched_iorr_ctl;
struct sched_bvt_control sched_bvt_ctl;
struct thread_object idle;
struct host_gdt gdt;
struct tss_64 tss;