Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b450129554213a4d4c5932f8a293646c029e1b0a
Commit: b450129554213a4d4c5932f8a293646c029e1b0a
Parent: c8d9c90c7ece28259436476a016cdecd25dccf2c
Author: Paul Jackson <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:14:47 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:22 2008 -0800
hotplug cpu move tasks in empty cpusets - refinements
- Narrow the scope of callback_mutex in scan_for_empty_cpusets().
- Avoid rewriting the cpus, mems of cpusets except when it is likely that
we'll be changing them.
- Have remove_tasks_in_empty_cpuset() also check for empty mems.
Signed-off-by: Paul Jackson <[EMAIL PROTECTED]>
Acked-by: Cliff Wickman <[EMAIL PROTECTED]>
Cc: David Rientjes <[EMAIL PROTECTED]>
Cc: Paul Menage <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
kernel/cpuset.c | 21 +++++++++++++--------
1 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 6868c1e..67b2bfe 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1709,7 +1709,8 @@ static void remove_tasks_in_empty_cpuset(struct cpuset
*cs)
* has online cpus, so can't be empty).
*/
parent = cs->parent;
- while (cpus_empty(parent->cpus_allowed))
+ while (cpus_empty(parent->cpus_allowed) ||
+ nodes_empty(parent->mems_allowed))
parent = parent->parent;
move_member_tasks_to_cpuset(cs, parent);
@@ -1741,7 +1742,6 @@ static void scan_for_empty_cpusets(const struct cpuset
*root)
list_add_tail((struct list_head *)&root->stack_list, &queue);
- mutex_lock(&callback_mutex);
while (!list_empty(&queue)) {
cp = container_of(queue.next, struct cpuset, stack_list);
list_del(queue.next);
@@ -1750,19 +1750,24 @@ static void scan_for_empty_cpusets(const struct cpuset
*root)
list_add_tail(&child->stack_list, &queue);
}
cont = cp->css.cgroup;
+
+ /* Continue past cpusets with all cpus, mems online */
+ if (cpus_subset(cp->cpus_allowed, cpu_online_map) &&
+ nodes_subset(cp->mems_allowed, node_states[N_HIGH_MEMORY]))
+ continue;
+
/* Remove offline cpus and mems from this cpuset. */
+ mutex_lock(&callback_mutex);
cpus_and(cp->cpus_allowed, cp->cpus_allowed, cpu_online_map);
nodes_and(cp->mems_allowed, cp->mems_allowed,
node_states[N_HIGH_MEMORY]);
+ mutex_unlock(&callback_mutex);
+
+ /* Move tasks from the empty cpuset to a parent */
if (cpus_empty(cp->cpus_allowed) ||
- nodes_empty(cp->mems_allowed)) {
- /* Move tasks from the empty cpuset to a parent */
- mutex_unlock(&callback_mutex);
+ nodes_empty(cp->mems_allowed))
remove_tasks_in_empty_cpuset(cp);
- mutex_lock(&callback_mutex);
- }
}
- mutex_unlock(&callback_mutex);
}
/*
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
