Commit 212d6d22 authored Aug 25, 2005 by Paul Jackson Committed by Linus Torvalds Aug 26, 2005

[PATCH] completely disable cpu_exclusive sched domain



At the suggestion of Nick Piggin and Dinakar, totally disable
the facility to allow cpu_exclusive cpusets to define dynamic
sched domains in Linux 2.6.13, in order to avoid problems
first reported by John Hawkes (corrupt sched data structures
and kernel oops).

This has been built for ppc64, i386, ia64, x86_64, sparc, alpha.
It has been built, booted and tested for cpuset functionality
on an SN2 (ia64).

Dinakar or Nick - could you verify that it for sure does avoid
the problems Hawkes reported.  Hawkes is out of town, and I don't
have the recipe to reproduce what he found.

Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent ca2f3daf

kernel/cpuset.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -627,6 +627,14 @@ static int validate_change(const struct cpuset cur, const struct cpuset trial)
		* Call with cpuset_sem held. May nest a call to the
		* lock_cpu_hotplug()/unlock_cpu_hotplug() pair.
		*/

		/*
		* Hack to avoid 2.6.13 partial node dynamic sched domain bug.
		* Disable letting 'cpu_exclusive' cpusets define dynamic sched
		* domains, until the sched domain can handle partial nodes.
		* Remove this #if hackery when sched domains fixed.
		*/
		#if 0
		static void update_cpu_domains(struct cpuset *cur)
		{
		struct cpuset c, par = cur->parent;
		@@ -667,6 +675,11 @@ static void update_cpu_domains(struct cpuset *cur)
		partition_sched_domains(&pspan, &cspan);
		unlock_cpu_hotplug();
		}
		#else
		static void update_cpu_domains(struct cpuset *cur)
		{
		}
		#endif

		static int update_cpumask(struct cpuset cs, char buf)
		{

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