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Fix RR scheduler and mutex/cond#36

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mlouielu wants to merge 5 commits intoPikoRT:masterfrom
mlouielu:fix-rr-scheduler
Open

Fix RR scheduler and mutex/cond#36
mlouielu wants to merge 5 commits intoPikoRT:masterfrom
mlouielu:fix-rr-scheduler

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@mlouielu mlouielu commented Aug 24, 2017 •
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This PR include three major fixed:

  1. Redesign RR scheduler to pass the test suite.
  2. Fix mutex, cond and pthread_mutex.
  3. Makefile can now switch scheduler via flags (make SCHED=RR)

@mlouielu mlouielu mentioned this pull request Aug 24, 2017
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@mlouielu mlouielu changed the title [WIP] Fix rr scheduler Fix RR scheduler and mutex/cond Aug 25, 2017
@mlouielu
Fix RR scheduler
857107f
@mlouielu
Fix mutex and cond with scheduler
8a956fc 
* mutex and cond should call `sched_dequeue` to remove
  `cur->ti_q` from its list when want to add `cur->ti_q`
  to another list.
* Change itt (thumb instruction) to normal instruction,
  due to the problem on QEMU.
jserv
jserv reviewed Aug 25, 2017
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README.md

## Makefile

You can switch scheduler by makefile flags:
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@jserv jserv Aug 25, 2017

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We should make scheduler pluggable as Linux does instead of configuring it at build time.

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@mlouielu mlouielu Aug 25, 2017

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It is possible to change scheduler in runtime using sched_select for now. But this is an easy step for running test and debugging.

jserv
jserv reviewed Aug 27, 2017
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kernel/sched.c

int sched_select(int sched_type, struct thread_info *thread)
{
printk("Scheduler: ");
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@jserv jserv Aug 27, 2017

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We don't need the invocation of printk in order to display scheduler internals literally. Instead, we can always deploy custom GDB script to perform deeper and effective tracing over existing framework.

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@mlouielu mlouielu Aug 28, 2017

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Sure, I'll take a reference from f9-kernel, except gdb script, maybe some probe can be plugin.

jserv
jserv reviewed Aug 27, 2017
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kernel/sched/rr.c
int sched_rr_init(void)
int sched_rr_init(struct thread_info *thread)
{
if (thread)
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@jserv jserv Aug 27, 2017

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Can we initialize without checking thread? That is, we can explicitly arrange the order.

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@mlouielu mlouielu Aug 28, 2017

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Why not check about thread is NULL or not (or maybe checking the type is struct thread_info), is there any benefit to put a NULL into runqueue?

@jserv jserv force-pushed the master branch 3 times, most recently from 5e65244 to 04a4478 Compare December 31, 2017 09:01
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