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authorPaul Jackson <pj@sgi.com>2005-05-20 16:59:15 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-20 18:48:19 -0400
commitb39c4fab259b216148e705344a892c96efe1946d (patch)
tree6419f40168e5b9a1eab2a6d413e85d82975dd6b2 /kernel/sched.c
parentb2665f92ae67a2d086537979d317a6f3a5697c63 (diff)
[PATCH] cpusets+hotplug+preepmt broken
This patch removes the entwining of cpusets and hotplug code in the "No more Mr. Nice Guy" case of sched.c move_task_off_dead_cpu(). Since the hotplug code is holding a spinlock at this point, we cannot take the cpuset semaphore, cpuset_sem, as would seem to be required either to update the tasks cpuset, or to scan up the nested cpuset chain, looking for the nearest cpuset ancestor that still has some CPUs that are online. So we just punt and blast the tasks cpus_allowed with all bits allowed. This reverts these lines of code to what they were before the cpuset patch. And it updates the cpuset Doc file, to match. The one known alternative to this that seems to work came from Dinakar Guniguntala, and required the hotplug code to take the cpuset_sem semaphore much earlier in its processing. So far as we know, the increased locking entanglement between cpusets and hot plug of this alternative approach is not worth doing in this case. Signed-off-by: Paul Jackson <pj@sgi.com> Acked-by: Nathan Lynch <ntl@pobox.com> Acked-by: Dinakar Guniguntala <dino@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 0dc3158667a2..66b2ed784822 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4243,7 +4243,7 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *tsk)
4243 4243
4244 /* No more Mr. Nice Guy. */ 4244 /* No more Mr. Nice Guy. */
4245 if (dest_cpu == NR_CPUS) { 4245 if (dest_cpu == NR_CPUS) {
4246 tsk->cpus_allowed = cpuset_cpus_allowed(tsk); 4246 cpus_setall(tsk->cpus_allowed);
4247 dest_cpu = any_online_cpu(tsk->cpus_allowed); 4247 dest_cpu = any_online_cpu(tsk->cpus_allowed);
4248 4248
4249 /* 4249 /*