Ingo Molnar wrote:
--
this patch (ontop of the current -mm scheduler patchset) tweaks
cpu_idle() semantics a bit: it changes the idle loops (that do
preemption) to call the first schedule() unconditionally.
the advantage is that as a result we dont have to set the idle thread's
NEED_RESCHED flag in init_idle(), which in turn makes cond_resched()
even more of an invariant: it can be called even from init code without
it having any effect. A cond resched in the init codepath hangs
otherwise.
this patch, while having no negative side-effects, enables wider use of
cond_resched()s. (which might happen in the stock kernel too, but it's
particulary important for voluntary-preempt) (note that for now this
patch only covers architectures that use kernel/Kconfig.preempt, but all
other architectures will work just fine too.)
Signed-off-by: Ingo Molnar <[email protected]>
Looks fine.
Acked-by: Nick Piggin <[email protected]>
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