PDS 0.99j release

PDS 0.99j is released with the following changes

1. Fix missing mainline scheduler API for psi.
2. Fix fail to build on ppc64 arch. This issue was reported to PDS-mq repository 3 months ago, and I have missed the notification, very sorry about that.
3. Several code implement level optimization.
 
This is the happy new year release of PDS, include bug fixes and optimization. Thanks for your supporting PDS in 2018. PDS achieved stability, feature and performance this year.

Looking forward in the incoming 2019, there is not much pending features in my list, and after those features, PDS may very close to 1.0 release(thus it just a release number). So, sometime next year, PDS development will slow down(it will still sync with mainline release and bug fixes), I will switch to another scheduler project, hopefully ideas can be inspired from each other projects and benefit from it.

Enjoy PDS 0.99j for v4.20 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.

PDS 0.99i release

PDS 0.99i is released with the following changes

1. Sync-up with mainline 4.20 scheduler code changes.

Xmas gift comes as promised and here is the first PDS release for 4.20, just the sync-up code changes added. The code has been run since -rc7 for about a week. So there should be no surprise in it, :D
But if you are seeking for surprise, well, there will be optimization code changes for the next release before the new year!

Enjoy PDS 0.99i for v4.20 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.

PDS 0.99h release

PDS 0.99h is released with the following changes

1. Fix cpu hot-plug Oops. Thanks @pf's report(again).
2. Rework time_slice_expired().  Simplified and unified task deadline reflash

This should be the last PDS release for 4.19 kernel. Other code implement level optimization are pending for 4.20. Hopefully kernel 4.20 and PDS for 4.20 could be on time as Xmas gift.

Enjoy PDS 0.99h for v4.19 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.

EDIT: Pls also checkout the emergency fix at  https://gitlab.com/alfredchen/linux-pds/commit/fae1a3c0fbe60b7edf6d8aac6b838520da68f9e4

4.20 is coming out soon, so there is no plan to dump up version for 4.19 again.

PDS 0.99g release

PDS 0.99g is released with the following changes

1. [Sync] c5511d03ec09 sched/smt: Make sched_smt_present track topology. A lot of changes from mainline in v4.19.7 and the incoming 4.20 kernel release.
2. Fix smt boot up crash. This fix a bug in 0.99f PDS release(not related to mainline code changes), thanks @pf's report and help for debugging.

This is a sync-up and bug-fix release.

Enjoy PDS 0.99g for v4.19 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.

PDS 0.99f release

PDS 0.99f is released with the following changes

1. Remove load balance code from scheduler_tick(). Based on recent code change and testing, looks like there is no need to check load balance in scheduler_tick() any more.
2. Default 4ms rr_interal. Trade off performance for interactivity improvement.
3. Rework sibling group balance. Reduce the overhead in sibling group balance by rework the code path.

This release includes balance code rework, and will be the biggest change in this kernel cycle. Please give it a try and feedback will be welcome.

Enjoy PDS 0.99f for v4.19 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.

PDS 0.99e release

PDS 0.99e is released with the following changes

1. Fix sched_fork() time slice fairness. Simplify the code and fairness first.
2. Refine take_other_rq_task() code path.
3. Remove cpumask_weight() in best_mask_cpu().

This release includes minor changes. It's good to have such small change release before the big one.

Enjoy PDS 0.99e for v4.19 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.

PDS 0.99d release

PDS 0.99d is released with the following changes

1. Rework SCHED_ISO support. Based on the limitation of the user land tools, for example, schedtool only support ISO tasks with priority specified, there is not big change for ISO. But this rework remove the "iso_cpu" kernel parameter. The logic behind this is, if your ISO task breaks the system, this parameter doesn't help(much), and if your ISO task runs well, you don't need to adjust this parameter. So, to keep the code simple, it has been removed.
2. UP compilation fix. Thanks jwh7's reporting. For the incoming release, I will do at least one UP compilation per kernel release cycle to prevent UP compilation breaks again.

This release includes the rest part of task policy support review in PDS. Now I am working on overhead cutting by cleaning up/reworking some balance code path. The next PDS release will be about two weeks later.

Enjoy PDS 0.99d for v4.19 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
All-in-one patch is available too.