VRQ 0.96f is released with the following changes
1. Improvement for smt sensitive scheduling.
2. No dequeue/enqueue for task on cpu.
3. Code clean up.
#2 is the major change in this release, unlike the previous version, now when task is going to be run on a cpu, there is no need to dequeue the task from the run queue skip list, enqueue/dequeue will only happen when task become runnable/unrunnable. With this change, the overhead of enqueue/dequeue is significantly reduced, and the logic of scheduler is more simple.
And please also be noticed, to adapt to this new enqueu/dequeue strategy, some important code path has been rewriten. You may experience unstable issues with this release. (So far, none for me at least)
Enjoy VRQ 0.96f for
v4.12 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
Wednesday, August 2, 2017
Wednesday, July 26, 2017
VRQ 0.96e release
VRQ 0.96e is released with the following changes
1. Remove unused run_list in task_struct.
2. Fix x32 compilation error. Reported and fixed by pf.
3. Sync-up try_to_wake_up_local().
4. cpu affinity fix. Reported by pf.
This is bug fix release.
Enjoy VRQ 0.96e for v4.12 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
BR Alfred
1. Remove unused run_list in task_struct.
2. Fix x32 compilation error. Reported and fixed by pf.
3. Sync-up try_to_wake_up_local().
4. cpu affinity fix. Reported by pf.
This is bug fix release.
Enjoy VRQ 0.96e for v4.12 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
BR Alfred
Sunday, July 9, 2017
VRQ 0.96d release
VRQ 0.96d is released with the following changes
1. smt sensitive scheduling improvement, which reduce some migration overhead.
2. Fix livepatch compilation issue.
This is bug fix and smt sensitive scheduling improvement release.
Enjoy VRQ 0.96d for v4.12 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
BR Alfred
1. smt sensitive scheduling improvement, which reduce some migration overhead.
2. Fix livepatch compilation issue.
This is bug fix and smt sensitive scheduling improvement release.
Enjoy VRQ 0.96d for v4.12 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
BR Alfred
Tuesday, July 4, 2017
VRQ 0.96c release
VRQ 0.96c is released with the following changes
1. Sync up mainline scheduler changes in 4.12
2. Clean up herder files.
This is just a sync-up release to bring VRQ to 4.12 kernel. Not new feature code is added in VRQ itself.
Enjoy VRQ 0.96c for v4.12 kernel, and unlock your SMT cpu ability with VRQ, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
BR Alfred
1. Sync up mainline scheduler changes in 4.12
2. Clean up herder files.
This is just a sync-up release to bring VRQ to 4.12 kernel. Not new feature code is added in VRQ itself.
Enjoy VRQ 0.96c for v4.12 kernel, and unlock your SMT cpu ability with VRQ, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.12.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.12.y-vrq
All-in-one patch is available too.
BR Alfred
Monday, July 3, 2017
VRQ 0.96b release
VRQ 0.96b is released with the following changes
1. smt sensitive scheduling v0.2, which fix issue with NR_CPUS > real cpu cores
Thank all for testing and finally bring SMT sensitive scheduling feature to VRQ. Feel free to test this release comparing to previous and enjoy the pleasure of unlocking the SMT capability, :)
I'm planing further improvement for SMT sensitive scheduling. Currently, I am not happy with implement code, there are duplicated code with migration code, and others. And it's late in this kernel release and time to look at sync-up works in 4.12 mainline.
Enjoy VRQ 0.96b for v4.11 kernel, and unlock your SMT cpu ability with VRQ, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.11.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.1.y-vrq
All-in-one patch is available too.
BR Alfred
1. smt sensitive scheduling v0.2, which fix issue with NR_CPUS > real cpu cores
Thank all for testing and finally bring SMT sensitive scheduling feature to VRQ. Feel free to test this release comparing to previous and enjoy the pleasure of unlocking the SMT capability, :)
I'm planing further improvement for SMT sensitive scheduling. Currently, I am not happy with implement code, there are duplicated code with migration code, and others. And it's late in this kernel release and time to look at sync-up works in 4.12 mainline.
Enjoy VRQ 0.96b for v4.11 kernel, and unlock your SMT cpu ability with VRQ, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.11.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.1.y-vrq
All-in-one patch is available too.
BR Alfred
Wednesday, June 7, 2017
VRQ 0.96 release
Abandon this release due to lock-up issues reported by users, the lock-up is caused by "Lock strategy update" commit, which works well on my working machines and continue during my work on SMT sensitive scheduling, that make me believe it was good and stable.
New "Lock strategy update" debug patch will be posted here for testing. Once it is confirmed work well for other users, the repined 096a will be released.
VRQ 0.96 is released with the following changes
1. Sync up cpufreq util usage.
2. Lock strategy update, which hopefully fix potential lock issue when task migrating.
3. SMT sensitive scheduling v0.1
Main feature in this release is the first version of SMT sensitive scheduling, which reduce 10s kernel compile benchmark on my test machine(original 7m17s) under 50% workload.
Or, you can easy to observe cpu usage changes when any physical cores available, scheduler will not put task to smt core. For example, if two tasks are running on a 2 cores 4 threads cpu, one will be on cpu 0 or 1, another will be on cpu 2 or 3.
Further improvement for SMT sensitive will be in next release. I'd see if any improvement/simplify can be made to current design.
Enjoy VRQ 0.96 for v4.11 kernel, and unlock your SMT cpu ability with VRQ, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.11.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.1.y-vrq
All-in-one patch is available too.
BR Alfred
New "Lock strategy update" debug patch will be posted here for testing. Once it is confirmed work well for other users, the repined 096a will be released.
VRQ 0.96 is released with the following changes
1. Sync up cpufreq util usage.
2. Lock strategy update, which hopefully fix potential lock issue when task migrating.
3. SMT sensitive scheduling v0.1
Main feature in this release is the first version of SMT sensitive scheduling, which reduce 10s kernel compile benchmark on my test machine(original 7m17s) under 50% workload.
Or, you can easy to observe cpu usage changes when any physical cores available, scheduler will not put task to smt core. For example, if two tasks are running on a 2 cores 4 threads cpu, one will be on cpu 0 or 1, another will be on cpu 2 or 3.
Further improvement for SMT sensitive will be in next release. I'd see if any improvement/simplify can be made to current design.
Enjoy VRQ 0.96 for v4.11 kernel, and unlock your SMT cpu ability with VRQ, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.11.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.1.y-vrq
All-in-one patch is available too.
BR Alfred
Thursday, May 4, 2017
VRQ 0.95b release
VRQ 0.95b is released with the following changes
1. Fix UP compilation issue with hrtick_enabled(), thanks jwh7 for reporting.
2. Sync up 4.11 mainline scheduler code changes.
This is mainly a sync-up release for 4.11 kernel. Please be notices that the frozen some time after suspend/resume issue still remains and it is confirmed that this also happen with vanilla kernel, so it's not caused by VRQ scheduler code. If suspend/resume is important for you, you may need to wait for the fix from mainline.
Enjoy VRQ 0.95b for v4.11 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.11.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.1.y-vrq
All-in-one patch is available too.
BR Alfred
1. Fix UP compilation issue with hrtick_enabled(), thanks jwh7 for reporting.
2. Sync up 4.11 mainline scheduler code changes.
This is mainly a sync-up release for 4.11 kernel. Please be notices that the frozen some time after suspend/resume issue still remains and it is confirmed that this also happen with vanilla kernel, so it's not caused by VRQ scheduler code. If suspend/resume is important for you, you may need to wait for the fix from mainline.
Enjoy VRQ 0.95b for v4.11 kernel, :)
code are available at
https://bitbucket.org/alfredchen/linux-gc/commits/branch/linux-4.11.y-vrq
and also
https://github.com/cchalpha/linux-gc/commits/linux-4.1.y-vrq
All-in-one patch is available too.
BR Alfred
Subscribe to:
Posts (Atom)