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    Subject[tip:sched/core] sched: Use rq->clock_task instead of rq->clock for correctly maintaining load averages
    Commit-ID:  05ca62c6ca17f39b88fa956d5ebc1fa6e93ad5e3
    Gitweb: http://git.kernel.org/tip/05ca62c6ca17f39b88fa956d5ebc1fa6e93ad5e3
    Author: Paul Turner <pjt@google.com>
    AuthorDate: Fri, 21 Jan 2011 20:45:02 -0800
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Wed, 26 Jan 2011 12:31:03 +0100

    sched: Use rq->clock_task instead of rq->clock for correctly maintaining load averages

    The delta in clock_task is a more fair attribution of how much time a tg has
    been contributing load to the current cpu.

    While not really important it also means we're more in sync (by magnitude)
    with respect to periodic updates (since __update_curr deltas are clock_task
    based).

    Signed-off-by: Paul Turner <pjt@google.com>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    LKML-Reference: <20110122044852.007092349@google.com>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    ---
    kernel/sched_fair.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
    index 1997383..0c26e2d 100644
    --- a/kernel/sched_fair.c
    +++ b/kernel/sched_fair.c
    @@ -725,7 +725,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
    if (cfs_rq->tg == &root_task_group)
    return;

    - now = rq_of(cfs_rq)->clock;
    + now = rq_of(cfs_rq)->clock_task;
    delta = now - cfs_rq->load_stamp;

    /* truncate load history at 4 idle periods */

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