Group Wieghted Round Robin Scheduling(GWRR) for linux
$30-100 USD
Cancelado
Publicado há mais de 14 anos
$30-100 USD
Pago na entrega
Its a new scheduling policy to support fair-share scheduling. We call this policy GWRR, for group weighted round-robin scheduling. GWRR should use fair-share scheduling based on each process's UNIX group identification. Let's start by assuming we will use a Round-Robin scheme to decide which group to choose. We keep a queue of groups, and whichever group was chosen last time we scheduled, we choose the next group in the queue for this schedule. We then choose a task within this group's set of tasks (more on this later), and let it run for a fixed amount of time. Use a simple round-robin (RR) scheduling algorithm to choose a task within a group. Add two system calls: int getgroupweight(int gid); int setgroupweight(int gid, int weight); getgroupweight() should return the weight of the specified group. The default group weight should be 10. setgroupweight() should give the specified group the specified weight. Your scheduler should operate alongside the existing Linux scheduler. Therefore, you should add a new scheduling policy, SCHED_GWRR. Only tasks whose policy is set to SCHED_GWRR (normally done via the system call sched_setscheduler()) should be considered for selection by your new scheduler. Your scheduler and the existing scheduler should interoperate as follows: If there are any running tasks whose policy is SCHED_RR or SCHED_FIFO (these are real-time tasks), one of them should be chosen before any other, according to the existing Linux scheduler rules. If there are any running tasks whose policy is SCHED_OTHER (the default scheduler), one of them should be chosen before any SCHED_GWRR (your scheduler) tasks, according to the default scheduler's rules. In other words, there should be a strict priority relationship where SCHED_RR and SCHED_FIFO are first, SCHED_OTHER is second, and SCHED_GWRR is last.
## Deliverables
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## Platform
Linux Kernel 2.6.3 and above