Pintos Advanced Scheduler Post: 302302402

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Top Forums Programming Pintos Advanced Scheduler Post 302302402 by orientalsanta on Monday 30th of March 2009 11:05:42 PM

03-31-2009

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Pintos Advanced Scheduler

I am in an operating system class at my college and recently we have been modifying the Pintos operating system in C. I have eliminated the Round Robin Scheduling and implemented priority scheduling just fine but now I have hit a wall on how to implement Advanced Scheduling and was hoping anyone here had advice on what to do, my professor has been unreachable so my questions remain.

The requirements were like so:

"You must write your code to allow us to choose a scheduling algorithm policy at Pintos startup time. By default, the priority scheduler must be active, but we must be able to choose the 4.4BSD scheduler with the -mlfqs kernel option. Passing this option sets thread_mlfqs, declared in threads/thread.h, to true when the options are parsed by parse_options(), which happens early in main().
When the 4.4BSD scheduler is enabled, threads no longer directly control their own priorities. The priority argument to thread_create() should be ignored, as well as any calls to thread_set_priority(), and thread_get_priority() should return the thread's current priority as set by the scheduler."

If anyone has any experience with pintos please let me know I've been trying this for about 6 hours and gotten nowhere.

orientalsanta

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LEARN ABOUT XFREE86

sched

sched.h(3HEAD)							      Headers							    sched.h(3HEAD)

NAME

       sched.h, sched - execution scheduling

SYNOPSIS

       #include <sched.h>

DESCRIPTION

       The  <sched.h>  header defines the sched_param structure, which contains the scheduling parameters required for implementation of each sup-
       ported scheduling policy. This structure contains the following member:

       int    sched_priority	process execution scheduling priority

       Each process is controlled by an associated scheduling policy and priority. Associated with each policy is a priority range.   Each  policy
       definition  specifies  the  minimum  priority range for that policy. The priority ranges for each policy may overlap the priority ranges of
       other policies.

       The scheduling policies are indicated by the values of the following symbolic constants:

       SCHED_FIFO      Processes are scheduled according to the First-In-First-Out (FIFO) policy. Processes scheduled to this policy, if not  pre-
		       empted by a higher priority or interrupted by a signal, will proceed until completion.

       SCHED_RR        Processes  are scheduled according to the Round-Robin (RR) policy. Processes scheduled to this policy, if not pre-empted by
		       a higher priority or interrupted by a signal, will execute for a time period, returned by sched_rr_get_interval(3RT) or	by
		       the system.

       SCHED_IA        Processes are scheduled according to the Inter-Active Class (IA) policy as described in priocntl(2).

       SCHED_OTHER     Processes are scheduled according to another policy not described above.

       The values of these constants are distinct.

       Inclusion of the <sched.h> header will make visible symbols defined in the header <time.h>.

SEE ALSO

       priocntl(2), sched_rr_get_interval(3RT), time.h(3HEAD)

SunOS 5.10							    4 Oct 2001							    sched.h(3HEAD)