[RFC][PATCH 00/14] sched/fair: A bit of a cgroup/PELT overhaul (again)..

From: Peter Zijlstra
Date: Fri May 12 2017 - 13:29:39 EST



Hi all,

So after staring at all that PELT stuff and working my way through it again:

https://lkml.kernel.org/r/20170505154117.6zldxuki2fgyo53n@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I started doing some patches to fix some of the identified broken.

So here are a few too many patches that do:

- fix 'reweight_entity' to instantly propagate the change in se->load.weight.

- rewrite/fix the propagate on migrate (attach/detach)

- introduce the hierarchical runnable_load_avg, as proposed by Tejun.

- synchronous detach for runnable migrates

- aligns the PELT windows between a cfs_rq and all its se's

- deals with random fallout from the above (some of this needs folding back
and reordering, but its all well past the point I should post this anyway).


IIRC pjt recently mentioned the reweight_entity thing, and I have very vague
memories he once talked about the window alignment thing -- which I only
remembered after (very painfully) having discovered I really needed that.

In any case, the reason I did the reweight_entity thing first, is because I
feel that is the right place to also propagate the hierarchical runnable_load,
as that is the natural place where a group's cfs_rq is coupled to its
sched_entity.

And the hierachical runnable_load needs that coupling. TJ did it by hijacking
the attach/detach migrate code, which I didn't much like. In any case, all
that got me looking at said attach/detach migrate code and find pain. So I went
and fixed that too.


Much thanks to Vincent and Dietmar for poking at early versions and reporting
failure and comments.

This still hasn't had a lot of testing, but its not obviously insane anymore
for the few tests we did do on it. Thread carefully though, a lot of code changed.


This can also be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/experimental


(my git tree is unsable and gets rebased a _lot_)

---
include/linux/sched.h | 3
kernel/sched/debug.c | 18 -
kernel/sched/fair.c | 811 +++++++++++++++++++++++++++++++-------------------
kernel/sched/sched.h | 19 -
4 files changed, 547 insertions(+), 304 deletions(-)