[PATCH 06/11] cpuset: apply cs->real_{cpus,mems}_allowed
Li Zefan
lizefan at huawei.com
Wed Aug 21 09:59:56 UTC 2013
Now we can use cs->real{cpus,mems}_allowed as effective masks. It's
used whenever:
- we update tasks' cpus_allowed/mems_allowed,
- we want to retrieve tasks_cs(tsk)'s cpus_allowed/mems_allowed.
They actually replace effective_{cpu,node}mask_cpuset().
Signed-off-by: Li Zefan <lizefan at huawei.com>
---
kernel/cpuset.c | 83 ++++++++++-----------------------------------------------
1 file changed, 14 insertions(+), 69 deletions(-)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index b7b63dd..0de15eb 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -318,9 +318,9 @@ static struct file_system_type cpuset_fs_type = {
*/
static void guarantee_online_cpus(struct cpuset *cs, struct cpumask *pmask)
{
- while (!cpumask_intersects(cs->cpus_allowed, cpu_online_mask))
+ while (!cpumask_intersects(cs->real_cpus_allowed, cpu_online_mask))
cs = parent_cs(cs);
- cpumask_and(pmask, cs->cpus_allowed, cpu_online_mask);
+ cpumask_and(pmask, cs->real_cpus_allowed, cpu_online_mask);
}
/*
@@ -336,9 +336,9 @@ static void guarantee_online_cpus(struct cpuset *cs, struct cpumask *pmask)
*/
static void guarantee_online_mems(struct cpuset *cs, nodemask_t *pmask)
{
- while (!nodes_intersects(cs->mems_allowed, node_states[N_MEMORY]))
+ while (!nodes_intersects(cs->real_mems_allowed, node_states[N_MEMORY]))
cs = parent_cs(cs);
- nodes_and(*pmask, cs->mems_allowed, node_states[N_MEMORY]);
+ nodes_and(*pmask, cs->real_mems_allowed, node_states[N_MEMORY]);
}
/*
@@ -804,45 +804,6 @@ void rebuild_sched_domains(void)
mutex_unlock(&cpuset_mutex);
}
-/*
- * effective_cpumask_cpuset - return nearest ancestor with non-empty cpus
- * @cs: the cpuset in interest
- *
- * A cpuset's effective cpumask is the cpumask of the nearest ancestor
- * with non-empty cpus. We use effective cpumask whenever:
- * - we update tasks' cpus_allowed. (they take on the ancestor's cpumask
- * if the cpuset they reside in has no cpus)
- * - we want to retrieve task_cs(tsk)'s cpus_allowed.
- *
- * Called with cpuset_mutex held. cpuset_cpus_allowed_fallback() is an
- * exception. See comments there.
- */
-static struct cpuset *effective_cpumask_cpuset(struct cpuset *cs)
-{
- while (cpumask_empty(cs->cpus_allowed))
- cs = parent_cs(cs);
- return cs;
-}
-
-/*
- * effective_nodemask_cpuset - return nearest ancestor with non-empty mems
- * @cs: the cpuset in interest
- *
- * A cpuset's effective nodemask is the nodemask of the nearest ancestor
- * with non-empty memss. We use effective nodemask whenever:
- * - we update tasks' mems_allowed. (they take on the ancestor's nodemask
- * if the cpuset they reside in has no mems)
- * - we want to retrieve task_cs(tsk)'s mems_allowed.
- *
- * Called with cpuset_mutex held.
- */
-static struct cpuset *effective_nodemask_cpuset(struct cpuset *cs)
-{
- while (nodes_empty(cs->mems_allowed))
- cs = parent_cs(cs);
- return cs;
-}
-
/**
* cpuset_change_cpumask - make a task's cpus_allowed the same as its cpuset's
* @tsk: task to test
@@ -857,9 +818,8 @@ static struct cpuset *effective_nodemask_cpuset(struct cpuset *cs)
static void cpuset_change_cpumask(struct task_struct *tsk, void *data)
{
struct cpuset *cs = data;
- struct cpuset *cpus_cs = effective_cpumask_cpuset(cs);
- set_cpus_allowed_ptr(tsk, cpus_cs->cpus_allowed);
+ set_cpus_allowed_ptr(tsk, cs->real_cpus_allowed);
}
/**
@@ -1014,14 +974,12 @@ static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
const nodemask_t *to)
{
struct task_struct *tsk = current;
- struct cpuset *mems_cs;
tsk->mems_allowed = *to;
do_migrate_pages(mm, from, to, MPOL_MF_MOVE_ALL);
- mems_cs = effective_nodemask_cpuset(task_cs(tsk));
- guarantee_online_mems(mems_cs, &tsk->mems_allowed);
+ guarantee_online_mems(task_cs(tsk), &tsk->mems_allowed);
}
/*
@@ -1116,13 +1074,12 @@ static void *cpuset_being_rebound;
static void update_tasks_nodemask(struct cpuset *cs, struct ptr_heap *heap)
{
static nodemask_t newmems; /* protected by cpuset_mutex */
- struct cpuset *mems_cs = effective_nodemask_cpuset(cs);
struct cpuset_change_nodemask_arg arg = { .cs = cs,
.newmems = &newmems };
cpuset_being_rebound = cs; /* causes mpol_dup() rebind */
- guarantee_online_mems(mems_cs, &newmems);
+ guarantee_online_mems(cs, &newmems);
/*
* The mpol_rebind_mm() call takes mmap_sem, which we couldn't
@@ -1556,8 +1513,6 @@ static void cpuset_attach(struct cgroup_subsys_state *css,
cpuset_subsys_id);
struct cpuset *cs = css_cs(css);
struct cpuset *oldcs = css_cs(oldcss);
- struct cpuset *cpus_cs = effective_cpumask_cpuset(cs);
- struct cpuset *mems_cs = effective_nodemask_cpuset(cs);
mutex_lock(&cpuset_mutex);
@@ -1565,9 +1520,9 @@ static void cpuset_attach(struct cgroup_subsys_state *css,
if (cs == &top_cpuset)
cpumask_copy(cpus_attach, cpu_possible_mask);
else
- guarantee_online_cpus(cpus_cs, cpus_attach);
+ guarantee_online_cpus(cs, cpus_attach);
- guarantee_online_mems(mems_cs, &cpuset_attach_nodemask_to);
+ guarantee_online_mems(cs, &cpuset_attach_nodemask_to);
cgroup_taskset_for_each(task, css, tset) {
/*
@@ -1584,11 +1539,9 @@ static void cpuset_attach(struct cgroup_subsys_state *css,
* Change mm, possibly for multiple threads in a threadgroup. This is
* expensive and may sleep.
*/
- cpuset_attach_nodemask_to = cs->mems_allowed;
+ cpuset_attach_nodemask_to = cs->real_mems_allowed;
mm = get_task_mm(leader);
if (mm) {
- struct cpuset *mems_oldcs = effective_nodemask_cpuset(oldcs);
-
mpol_rebind_mm(mm, &cpuset_attach_nodemask_to);
/*
@@ -1599,7 +1552,7 @@ static void cpuset_attach(struct cgroup_subsys_state *css,
* mm from.
*/
if (is_memory_migrate(cs)) {
- cpuset_migrate_mm(mm, &mems_oldcs->old_mems_allowed,
+ cpuset_migrate_mm(mm, &oldcs->old_mems_allowed,
&cpuset_attach_nodemask_to);
}
mmput(mm);
@@ -2398,23 +2351,17 @@ void __init cpuset_init_smp(void)
void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask)
{
- struct cpuset *cpus_cs;
-
mutex_lock(&callback_mutex);
task_lock(tsk);
- cpus_cs = effective_cpumask_cpuset(task_cs(tsk));
- guarantee_online_cpus(cpus_cs, pmask);
+ guarantee_online_cpus(task_cs(tsk), pmask);
task_unlock(tsk);
mutex_unlock(&callback_mutex);
}
void cpuset_cpus_allowed_fallback(struct task_struct *tsk)
{
- struct cpuset *cpus_cs;
-
rcu_read_lock();
- cpus_cs = effective_cpumask_cpuset(task_cs(tsk));
- do_set_cpus_allowed(tsk, cpus_cs->cpus_allowed);
+ do_set_cpus_allowed(tsk, task_cs(tsk)->real_cpus_allowed);
rcu_read_unlock();
/*
@@ -2453,13 +2400,11 @@ void cpuset_init_current_mems_allowed(void)
nodemask_t cpuset_mems_allowed(struct task_struct *tsk)
{
- struct cpuset *mems_cs;
nodemask_t mask;
mutex_lock(&callback_mutex);
task_lock(tsk);
- mems_cs = effective_nodemask_cpuset(task_cs(tsk));
- guarantee_online_mems(mems_cs, &mask);
+ guarantee_online_mems(task_cs(tsk), &mask);
task_unlock(tsk);
mutex_unlock(&callback_mutex);
--
1.8.0.2
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