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[PATCH] cpuset: implement cpuset_mems_allowed

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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>
This commit is contained in:
Paul Jackson
2006-01-08 01:01:55 -08:00
committed by Linus Torvalds
parent cf2a473c40
commit 909d75a3b7
3 changed files with 33 additions and 7 deletions
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29
kernel/cpuset.c
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@@ -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;
@@ -1889,6 +1889,29 @@ void cpuset_init_current_mems_allowed(void)
current->mems_allowed = NODE_MASK_ALL;
}
/**
* 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