Ingo, The first of the patches is a minor fix to when a woken RT task is about to preempt a pinned RT task, push_rt_task() is called to try to migrate the woken task if possible (to avoid preempting a pinned RT task that may be the second highest priority task in the system).
But the issue is that push_rt_task() won't push it if the woken task
is higher priority even if the task to be preempted is pinned.
The second two patches is more of a clean up to remove the idle
hooks in the scheduler proper, and to use the pre/post schedule
methods instead.
This allows interrupts to be enabled in the idle balance, which slightly
helps latencies, especially for the -rt kernel. Other patches can be
added on top. Maybe in the future preemption could be enabled during
the idle balance as well. But that remains to be seen.
Please pull the latest tip/sched/core tree, which can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
tip/sched/core
Head SHA1: 1db13ecf89054d39922e7b3323d124c7e2921560
Steven Rostedt (Red Hat) (3):
sched/rt: Fix push_rt_task() to have the same checks as the caller did
sched: Move idle_balance() to post_schedule
sched: Enable interrupts in idle_balance()
----
kernel/sched/core.c | 3 ---
kernel/sched/fair.c | 8 +++++---
kernel/sched/idle_task.c | 10 ++++++++++
kernel/sched/rt.c | 15 ++++++++++-----
4 files changed, 25 insertions(+), 11 deletions(-)
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