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authorPaul Jackson <pj@sgi.com>2006-01-08 01:01:55 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:44 -0800
commit909d75a3b77bdd8baa9429bad3b69a654d2954ce (patch)
treef9955ff697b7569fc75e5b8683d886315f34ac49 /kernel/cpuset.c
parentcf2a473c4089aa41c26f653200673f5a4cc25047 (diff)
downloadop-kernel-dev-909d75a3b77bdd8baa9429bad3b69a654d2954ce.zip
op-kernel-dev-909d75a3b77bdd8baa9429bad3b69a654d2954ce.tar.gz
[PATCH] cpuset: implement cpuset_mems_allowed
Provide a cpuset_mems_allowed() method, which the sys_migrate_pages() code needed, to obtain the mems_allowed vector of a cpuset, and replaced the workaround in sys_migrate_pages() to call this new method. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c29
1 files changed, 26 insertions, 3 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index e9917d7..0d0dbbd 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1871,14 +1871,14 @@ void cpuset_exit(struct task_struct *tsk)
* tasks cpuset.
**/
-cpumask_t cpuset_cpus_allowed(const struct task_struct *tsk)
+cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
{
cpumask_t mask;
down(&callback_sem);
- task_lock((struct task_struct *)tsk);
+ task_lock(tsk);
guarantee_online_cpus(tsk->cpuset, &mask);
- task_unlock((struct task_struct *)tsk);
+ task_unlock(tsk);
up(&callback_sem);
return mask;
@@ -1890,6 +1890,29 @@ void cpuset_init_current_mems_allowed(void)
}
/**
+ * cpuset_mems_allowed - return mems_allowed mask from a tasks cpuset.
+ * @tsk: pointer to task_struct from which to obtain cpuset->mems_allowed.
+ *
+ * Description: Returns the nodemask_t mems_allowed of the cpuset
+ * attached to the specified @tsk. Guaranteed to return some non-empty
+ * subset of node_online_map, even if this means going outside the
+ * tasks cpuset.
+ **/
+
+nodemask_t cpuset_mems_allowed(struct task_struct *tsk)
+{
+ nodemask_t mask;
+
+ down(&callback_sem);
+ task_lock(tsk);
+ guarantee_online_mems(tsk->cpuset, &mask);
+ task_unlock(tsk);
+ up(&callback_sem);
+
+ return mask;
+}
+
+/**
* cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed
* @zl: the zonelist to be checked
*
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