VRQ 0.94 release

VRQ 0.94 is released with the following changes

1. Remove duplicated code
2. Fix compilation issue with CONFIG_CPU_FREQ and CONFIG_IRQ_TIME_ACCOUNTING
3. Remove root_domain and sched_domain, which VRQ doesn't depend on. This reduce about 2k LOC of the scheduler code.

I have done some tests on SMT machine for the >100% regression issue, but for some kind of reason, I can't reproduce it, so now it is in the long-term watch list and let VRQ development going. Enjoy VRQ 0.94 for v4.10 kernel, :)

In next release, hrtimer and full no hz support are in the planning list.

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.10.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.10.y-vrq

All-in-one patch is available too.

BR Alfred 

VRQ 0.93a release

VRQ 0.93a is released with the following changes

1. UP compilation fix for task policy fairness(reported by jwh7)
2. Sync up mainline 4.10 scheduler changes
3. remove unused stime_pc and utime_pc
4. Fix task cpu runtime accounting (reported by Eduardo)

This is a bug fix release. Enjoy VRQ 0.93a for v4.10 kernel, :)

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.10.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.10.y-vrq

All-in-one patch is available too.

BR Alfred 

VRQ 0.93 release

VRQ 0.93 is released with the following changes

1. remove unused rq->running and refine set_rq_task(), remove unused finish_arch_switch, these two changes are continuous code clean up.
2. Fix 32bit compilation issue in cputime.c(reported by jwh7)
3. task policy fairness

Task policy fairness is the major code change in this release, which address the issue that NORMAL policy(and supper) tasks fail to suppress the background IDLE policy tasks. There are used to be two design options for this issue, but turns out that one of them is better than another with less overhead. So the code changes are in this VRQ release and no more debug patch is needed.

In next release, mainline kernel 4.10 sync-up and code clean-up are in the planning list. And I am investigating new created task issue, hopefully be fixed in next release.

Enjoy VRQ 0.93, :)

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.9.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.9.y-vrq

All-in-one patch is available too.

BR Alfred 

VRQ 0.92 release

VRQ 0.92 is released with the following changes

1. remove printk in migrate_tasks()
2. vrq: refine normalize_rt_tasks()
3. vrq: Optimist ffb usage in skiplist_random_level()
4. vrq: introduce cputime.c
5. vrq: remove unused sched_domain_level
6. vrq: remove rq->timekeep_clock

Most are code clean up and little optimist. The major one is introducing mainline cputime.c, which help to reduce vrq scheduler main code size under 7k LOC and reduce the effect syncing up with mainline kernel scheduler code from release to release.

Enjoy VRQ 0.92, :)

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.9.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.9.y-vrq

All-in-one patch is available too.

BR Alfred 

VRQ 0.91 release

VRQ 0.91 is released with the following changes

1. rework yield_to(), make it to be suit in VRQ scheduler.
2. Remove rq_deadline which is only used locally.
3. remove unused sched_interactive, there is policy based interactivity setting in VRQ, so remove this BFS scheduler system parameter.
4. Do irq_enter on scheduler_ipi called when idle to update xtime. Pick up from MuQSS.
5. Remove dup'd vtime_task_switch. Pick up from MuQSS.
6. remove unused double_rq_lock/double_rq_unlock
7. rework take_other_rq_task(). This rework provided more interactivity for RT/ISO/NORMAL tasks.
#7 is considered as a fix for D3 wine playing issue under ondemand cpufreq governor. Is it works, there would be other commits for further tuning.

Enjoy the first release of VRQ in 2017, :)

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.9.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.9.y-vrq

All-in-one patch is available too.

BR Alfred 

VRQ 0.90 release

VRQ 0.90 is released with the following changes

1. Introduce sched_yield_type from MuQSS
2. Remove temp valuables in run queue for current task
3. Refine dither.

As there is no more previous vrq feature code need to be ported, I'd like to announce VRQ 0.90 release just before the new year. All known issues will be traced in 0.90+ releases.

In the 0.90+ release, I am planning to focus on fixing known issues, porting useful code changes from BFS/MuQSS and develop new features in VRQ.

Enjoy 0.90 release of VRQ in 2017, :)

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.9.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.9.y-vrq

All-in-one patch is available too.

BR Alfred 

VRQ 0.89h release

VRQ 0.89h is released with the following changes

1. Fix UP compile issue.
2. Refine take_other_rq_task(), which create a code path for cpu running scaling frequency.
3. Code clean up and remove un-used code.

I'd spend the rest week of this year to double check if there are still helpful feature in previous VRQ not yet been ported to 0.89, if no, there will be 0.9 release at the end of 2016.

Enjoy this X'mas release of VRQ, :)

code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.9.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.9.y-vrq

All-in-one patch is available too.

BR Alfred