Hi all, So after staring at all that PELT stuff and working my way through it again:
https://lkml.kernel.org/r/[email protected] 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(-)
