Re: [PATCH 00/24] Complete EEVDF

Vincent Guittot
2024-08-14T14:34:19Z

On Sat, 27 Jul 2024 at 13:02, Peter Zijlstra <peterz@infradead.org> wrote:
>
> Hi all,
>
> So after much delay this is hopefully the final version of the EEVDF patches.
> They've been sitting in my git tree for ever it seems, and people have been
> testing it and sending fixes.
>
> I've spend the last two days testing and fixing cfs-bandwidth, and as far
> as I know that was the very last issue holding it back.
>
> These patches apply on top of queue.git sched/dl-server, which I plan on merging
> in tip/sched/core once -rc1 drops.
>
> I'm hoping to then merge all this (+- the DVFS clock patch) right before -rc2.

While trying to test what would be the impact of delayed dequeue on
load_avg, I noticed something strange with the running slice. I have a
simple test with 2 always running threads on 1 CPU and the each thread
runs around 100ms continuously before switching to the other one
whereas I was expecting 3ms (the sysctl_sched_base_slice on my system)
between 2 context swicthes

I'm using your sched/core branch. Is it the correct one ?

>
>
> Aside from a ton of bug fixes -- thanks all! -- new in this version is:
>
> - split up the huge delay-dequeue patch
> - tested/fixed cfs-bandwidth
> - PLACE_REL_DEADLINE -- preserve the relative deadline when migrating
> - SCHED_BATCH is equivalent to RESPECT_SLICE
> - propagate min_slice up cgroups
> - CLOCK_THREAD_DVFS_ID
>
>