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    SubjectRe: Plumbers: Tweaking scheduler policy micro-conf RFP

    * Peter Zijlstra <> wrote:

    > On Sat, 2012-05-19 at 10:08 -0700, Linus Torvalds wrote:
    > > And I
    > > *do* know that the real world simply isn't simple enough that we could
    > > ever do a perfect job, so don't even try - instead aim for
    > > "understandable, maintainable, and gets the main issues roughly
    > > right".
    > I think we're in violent agreement on many points and most of
    > this is based on a mis-understanding. I've argued for exactly
    > this many times.

    it's these pending commits in tip:sched/core:

    8e7fbcbc22c1 sched: Remove stale power aware scheduling remnants and dysfunctional knobs
    fac536f7e492 Merge branch 'sched/urgent' into sched/core
    13e099d2f77e sched/debug: Fix printing large integers on 32-bit platforms
    e44bc5c5d00e sched/fair: Improve the ->group_imb logic
    556061b00c9f sched/nohz: Fix rq->cpu_load[] calculations
    870a0bb5d636 sched/numa: Don't scale the imbalance
    04f733b4afac sched/fair: Revert sched-domain iteration breakage
    316ad248307f sched/x86: Rewrite set_cpu_sibling_map()
    dd7d8634e619 sched/numa: Fix the new NUMA topology bits
    cb83b629bae0 sched/numa: Rewrite the CONFIG_NUMA sched domain support
    bd939f45da24 sched/fair: Propagate 'struct lb_env' usage into find_busiest_group
    0ce90475dcdb sched/fair: Add some serialization to the sched_domain load-balance walk
    c22402a2f76e sched/fair: Let minimally loaded cpu balance the group
    c82513e51355 sched: Change rq->nr_running to unsigned int
    ad7687dde878 x86/numa: Check for nonsensical topologies on real hw as well
    0acbb440f063 x86/numa: Hard partition cpu topology masks on node boundaries
    94c0dd3278dd x86/numa: Allow specifying node_distance() for numa=fake
    19209bbb8612 x86/sched: Make mwait_usable() heed to "idle=" kernel parameters properly
    489a71b029cd sched: Update documentation and comments

    the result of these commits is:

    24 files changed, 417 insertions(+), 975 deletions(-)

    Most of the linecount win is due to the removal of the
    dysfunctional power scheduling - but even without that commit
    it's a simplification:

    15 files changed, 415 insertions(+), 481 deletions(-)

    while it lifts the historic limitations of the sched-domains
    approach and makes the code a whole lot more logical.

    Nevertheless I'll wait for Linus to confirm that he agrees
    violently as well, before sending these bits ;-)



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