Re: [PATCH] cpuset: Rework sched domains and CPU hotplug handling(2.6.27-rc1)
From: Max Krasnyansky
Date: Tue Aug 05 2008 - 16:31:40 EST
Paul Jackson wrote:
Max wrote:
Actually it is appropriate, and there is one more user of the
arch_reinit_sched_domains() which is S390 topology updates.
Those things (mc_power and topology updates) have to update domain flags based
on the mc/smt power and current topology settings.
Hmmm ... ok I suppose.
Could we have the kernel/sched.c code, in this case, call the
kernel/cpuset.c routine async_rebuild_sched_domains(), rather
than the synchronous rebuild_sched_domains() call (in your naming)
which required details of the get_online_cpus() and put_online_cpus()
wrapping to leak into kernel/sched.c:arch_reinit_sched_domains()
routine?
It could I guess. But the questions is why ?
I mean the only reason we've introduced workqueue is because lock
nesting got too complicated. Otherwise in all those paths we're already
in a process context and there is no need to schedule a workqueue.
I see your point about get_online_cpus() thing. But it is similar to
partition_sched_domains() which is an external (from the sched pov)
interface and must be called within get_online_cpus() ... put_online_cpus().
Max
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