forked from luck/tmp_suning_uos_patched
cpuset: modify cpuset_set_cpus_allowed to use cpumask pointer
* Modify cpuset_cpus_allowed to return the currently allowed cpuset via a pointer argument instead of as the function return value. * Use new set_cpus_allowed_ptr function. * Cleanup CPU_MASK_ALL and NODE_MASK_ALL uses. Depends on: [sched-devel]: sched: add new set_cpus_allowed_ptr function Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -20,8 +20,8 @@ extern int number_of_cpusets; /* How many cpusets are defined in system? */
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extern int cpuset_init_early(void);
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extern int cpuset_init(void);
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extern void cpuset_init_smp(void);
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extern cpumask_t cpuset_cpus_allowed(struct task_struct *p);
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extern cpumask_t cpuset_cpus_allowed_locked(struct task_struct *p);
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extern void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask);
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extern void cpuset_cpus_allowed_locked(struct task_struct *p, cpumask_t *mask);
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extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
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#define cpuset_current_mems_allowed (current->mems_allowed)
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void cpuset_init_current_mems_allowed(void);
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@ -84,13 +84,14 @@ static inline int cpuset_init_early(void) { return 0; }
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static inline int cpuset_init(void) { return 0; }
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static inline void cpuset_init_smp(void) {}
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static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
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static inline void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask)
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{
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return cpu_possible_map;
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*mask = cpu_possible_map;
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}
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static inline cpumask_t cpuset_cpus_allowed_locked(struct task_struct *p)
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static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
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cpumask_t *mask)
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{
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return cpu_possible_map;
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*mask = cpu_possible_map;
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}
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static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
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@ -729,7 +729,7 @@ int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
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*/
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void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
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{
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set_cpus_allowed(tsk, (cgroup_cs(scan->cg))->cpus_allowed);
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set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed));
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}
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/**
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@ -1178,7 +1178,7 @@ static void cpuset_attach(struct cgroup_subsys *ss,
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mutex_lock(&callback_mutex);
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guarantee_online_cpus(cs, &cpus);
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set_cpus_allowed(tsk, cpus);
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set_cpus_allowed_ptr(tsk, &cpus);
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mutex_unlock(&callback_mutex);
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from = oldcs->mems_allowed;
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@ -1555,8 +1555,8 @@ static struct cgroup_subsys_state *cpuset_create(
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if (is_spread_slab(parent))
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set_bit(CS_SPREAD_SLAB, &cs->flags);
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set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
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cs->cpus_allowed = CPU_MASK_NONE;
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cs->mems_allowed = NODE_MASK_NONE;
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cpus_clear(cs->cpus_allowed);
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nodes_clear(cs->mems_allowed);
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cs->mems_generation = cpuset_mems_generation++;
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fmeter_init(&cs->fmeter);
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@ -1625,8 +1625,8 @@ int __init cpuset_init(void)
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{
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int err = 0;
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top_cpuset.cpus_allowed = CPU_MASK_ALL;
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top_cpuset.mems_allowed = NODE_MASK_ALL;
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cpus_setall(top_cpuset.cpus_allowed);
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nodes_setall(top_cpuset.mems_allowed);
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fmeter_init(&top_cpuset.fmeter);
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top_cpuset.mems_generation = cpuset_mems_generation++;
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@ -1844,6 +1844,7 @@ void __init cpuset_init_smp(void)
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* cpuset_cpus_allowed - return cpus_allowed mask from a tasks cpuset.
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* @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed.
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* @pmask: pointer to cpumask_t variable to receive cpus_allowed set.
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*
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* Description: Returns the cpumask_t cpus_allowed of the cpuset
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* attached to the specified @tsk. Guaranteed to return some non-empty
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@ -1851,35 +1852,27 @@ void __init cpuset_init_smp(void)
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* tasks cpuset.
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**/
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cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
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void cpuset_cpus_allowed(struct task_struct *tsk, cpumask_t *pmask)
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{
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cpumask_t mask;
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mutex_lock(&callback_mutex);
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mask = cpuset_cpus_allowed_locked(tsk);
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cpuset_cpus_allowed_locked(tsk, pmask);
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mutex_unlock(&callback_mutex);
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return mask;
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}
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/**
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* cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset.
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* Must be called with callback_mutex held.
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**/
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cpumask_t cpuset_cpus_allowed_locked(struct task_struct *tsk)
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void cpuset_cpus_allowed_locked(struct task_struct *tsk, cpumask_t *pmask)
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{
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cpumask_t mask;
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task_lock(tsk);
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guarantee_online_cpus(task_cs(tsk), &mask);
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guarantee_online_cpus(task_cs(tsk), pmask);
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task_unlock(tsk);
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return mask;
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}
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void cpuset_init_current_mems_allowed(void)
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{
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current->mems_allowed = NODE_MASK_ALL;
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nodes_setall(current->mems_allowed);
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}
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/**
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@ -4941,13 +4941,13 @@ long sched_setaffinity(pid_t pid, cpumask_t new_mask)
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if (retval)
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goto out_unlock;
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cpus_allowed = cpuset_cpus_allowed(p);
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cpuset_cpus_allowed(p, &cpus_allowed);
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cpus_and(new_mask, new_mask, cpus_allowed);
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again:
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retval = set_cpus_allowed(p, new_mask);
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if (!retval) {
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cpus_allowed = cpuset_cpus_allowed(p);
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cpuset_cpus_allowed(p, &cpus_allowed);
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if (!cpus_subset(new_mask, cpus_allowed)) {
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/*
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* We must have raced with a concurrent cpuset
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@ -5661,7 +5661,9 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
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/* No more Mr. Nice Guy. */
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if (dest_cpu >= nr_cpu_ids) {
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cpumask_t cpus_allowed = cpuset_cpus_allowed_locked(p);
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cpumask_t cpus_allowed;
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cpuset_cpus_allowed_locked(p, &cpus_allowed);
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/*
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* Try to stay on the same cpuset, where the
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* current cpuset may be a subset of all cpus.
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@ -187,8 +187,8 @@ static int pdflush(void *dummy)
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* This is needed as pdflush's are dynamically created and destroyed.
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* The boottime pdflush's are easily placed w/o these 2 lines.
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*/
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cpus_allowed = cpuset_cpus_allowed(current);
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set_cpus_allowed(current, cpus_allowed);
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cpuset_cpus_allowed(current, &cpus_allowed);
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set_cpus_allowed_ptr(current, &cpus_allowed);
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return __pdflush(&my_work);
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}
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