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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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3
hypervisor/common/schedule.c
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@@ -78,6 +78,9 @@ void init_sched(uint16_t pcpu_id)
#endif
#ifdef CONFIG_SCHED_IORR
ctl->scheduler = &sched_iorr;
#endif
#ifdef CONFIG_SCHED_BVT
ctl->scheduler = &sched_bvt;
#endif
if (ctl->scheduler->init != NULL) {
ctl->scheduler->init(ctl);