Sunday, August 12, 2018

PDS 0.98u release

PDS 0.98u is released with the following changes

1. Sync up mainline scheduler changes in 4.18

This is the first PDS-mq release for kernel 4.18. As usual, it just a sync-up release, it all goes well. The next PDS-mq release will be arrived at the weekend, 10+ commits are pending.

Enjoy PDS 0.98u for v4.18 kernel, :)

Code are available at https://gitlab.com/alfredchen/linux-pds
(Say good-bye to github)

All-in-one patch is available too.

Edit: Fix all-in-one patch link.

Sunday, July 15, 2018

PDS 0.98t release

PDS 0.98t is released with the following changes

1. Rework pds_load_balance() based on current implementation. It's the main feature of this release.
2. Minor optimization in task_preemptible_rq().

This is the last release for 4.17, with the rework of balance code path as promise. The sanity test shows there are minor improvement over all workload due to balance overhead cutting. So far, I'd like to call it for the balance overhead cutting work and move on for next main line sync up and investigation of other potential improvement.

Enjoy PDS 0.98t for v4.17 kernel, :)

Code are available at
https://github.com/cchalpha/linux-gc/commits/linux-4.17.y-pds
and also
https://gitlab.com/alfredchen/linux-pds

All-in-one patch is available too.

PS: Here is the updated patch for v4.17.12+ kernel

https://gitlab.com/alfredchen/PDS-mq/raw/master/4.17/v4.17.12+_pds098t.patch
 

Monday, July 9, 2018

PDS 0.98s release

PDS 0.98s is released with the following changes

1. Fix compilation issue on raspberry pi.
2. Minor rework and optimization on balance code path.
3. Fix wrong nr_max_tries in migrate_pending_tasks.

This is mainly a bug fix and minor optimization release for 4.17. The rework of balance code doesn't go well, it actually make more overhead than current implement. Another rework which based on current implement is still on going, hopefully be included in next release.

Enjoy PDS 0.98s for v4.17 kernel, :)

Code are available at
https://github.com/cchalpha/linux-gc/commits/linux-4.17.y-pds
and also
https://gitlab.com/alfredchen/linux-pds

All-in-one patch is available too.

Monday, June 11, 2018

PDS 0.98r release

PDS 0.98r is released with the following changes

1. Fix compilation error when build CFS.
2. Optimization here and there.
3. Pick one more remaining sync-up from mainline.

This is the second PDS release for 4.17. It's mainly for bug fix, continue sync-up pick-up and minor optimization. After this, I'm reworking the balance, hopefully helping reducing the overhead.

Enjoy PDS 0.98r for v4.17 kernel, :)

Code are available at
https://github.com/cchalpha/linux-gc/commits/linux-4.17.y-pds
and also
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.17.y-pds (Will be deprecated soon)

All-in-one patch is available too.(Now the link is from github PDS-mq repository, although MS has bought github which make uncertain future of github, but moving from bitbucket is certain, all-in-one patch will not be uploaded to download page of bitbucket repository from this release)

Monday, June 4, 2018

PDS 0.98q release

PDS 0.98q is released with the following changes

1.Sync up with 4.17 mainline scheduler changes.

This is the first PDS release in 4.17. Because there are head files related code changes from mainline, so there may be chances compilation doesn't work under given combination of kernel config(scheduler related), please report back when it happens. Two "last minute" scheduler changes haven't been pick up from mainline, need more time to see how it apply upon PDS, because it happens on critical code path.

Known issue, but not PDS related, chromebook pixel failed to suspend(same on mainline CFS).

Enjoy PDS 0.98q for v4.17 kernel, :)

Code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.17.y-pds
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.17.y-pds

All-in-one patch is available too.

Sunday, May 13, 2018

PDS 0.98p release

PDS 0.98p is released with the following changes

1. Minor code optimization here and there.
2. Balance optimization. This fix regression in 098n when workload % < core number.
3. 32ms balance interval.

This is the last PDS release in 4.16 kernel, thanks for the benchmark testing by Predo and Manuel, a regression in 098n release is identified and fix. In this release, the balance interval also increase to 32ms, this will help with throughput, let's test this setting before there is new way to do balance later(maybe next kernel release).

Enjoy PDS 0.98p for v4.16 kernel, :)

Code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.16.y-pds
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.16.y-pds

All-in-one patch is available too.


PS, please apply the below patch if you don't have SMT enabled in kernel config, or if you don't know what's in your kernel config, you'd better have it. Thanks manuel for reporting.

 https://bitbucket.org/alfredchen/linux-gc/downloads/v4.16_pda098p_non_smt_fix.patch

Wednesday, May 2, 2018

PDS 0.98o release

PDS 0.98o is released with the following changes

1. Minor code cleanup and optimization here and there.
2. Fix a bug in get_nohz_timer_target().

Although there is no improvement can be observed in sanity tests, but there should be no regression too. Code cleanup and optimization will be continued in next release(in two or three weeks) then some features will add in next kernel release.

Enjoy PDS 0.98o for v4.16 kernel, :)

Code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.16.y-pds
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.16.y-pds

All-in-one patch is available too.