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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>
This commit is contained in:
Mike Travis 2008-04-04 18:11:07 -07:00 committed by Ingo Molnar
parent f70316dace
commit f9a86fcbbb
4 changed files with 26 additions and 30 deletions
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13
include/linux/cpuset.h
View File

@ -20,8 +20,8 @@ extern int number_of_cpusets; /* How many cpusets are defined in system? */
extern int cpuset_init_early(void);
extern int cpuset_init(void);
extern void cpuset_init_smp(void);
extern cpumask_t cpuset_cpus_allowed(struct task_struct *p);
extern cpumask_t cpuset_cpus_allowed_locked(struct task_struct *p);
extern void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask);
extern void cpuset_cpus_allowed_locked(struct task_struct *p, cpumask_t *mask);
extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
#define cpuset_current_mems_allowed (current->mems_allowed)
void cpuset_init_current_mems_allowed(void);
@ -84,13 +84,14 @@ static inline int cpuset_init_early(void) { return 0; }
static inline int cpuset_init(void) { return 0; }
static inline void cpuset_init_smp(void) {}
static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
static inline void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask)
{
return cpu_possible_map;
*mask = cpu_possible_map;
}
static inline cpumask_t cpuset_cpus_allowed_locked(struct task_struct *p)
static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
cpumask_t *mask)
{
return cpu_possible_map;
*mask = cpu_possible_map;
}
static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)

31
kernel/cpuset.c
View File

@ -729,7 +729,7 @@ int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
*/
void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
{
set_cpus_allowed(tsk, (cgroup_cs(scan->cg))->cpus_allowed);
set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed));
}
/**
@ -1178,7 +1178,7 @@ static void cpuset_attach(struct cgroup_subsys *ss,
mutex_lock(&callback_mutex);
guarantee_online_cpus(cs, &cpus);
set_cpus_allowed(tsk, cpus);
set_cpus_allowed_ptr(tsk, &cpus);
mutex_unlock(&callback_mutex);
from = oldcs->mems_allowed;
@ -1555,8 +1555,8 @@ static struct cgroup_subsys_state *cpuset_create(
if (is_spread_slab(parent))
set_bit(CS_SPREAD_SLAB, &cs->flags);
set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
cs->cpus_allowed = CPU_MASK_NONE;
cs->mems_allowed = NODE_MASK_NONE;
cpus_clear(cs->cpus_allowed);
nodes_clear(cs->mems_allowed);
cs->mems_generation = cpuset_mems_generation++;
fmeter_init(&cs->fmeter);
@ -1625,8 +1625,8 @@ int __init cpuset_init(void)
{
int err = 0;
top_cpuset.cpus_allowed = CPU_MASK_ALL;
top_cpuset.mems_allowed = NODE_MASK_ALL;
cpus_setall(top_cpuset.cpus_allowed);
nodes_setall(top_cpuset.mems_allowed);
fmeter_init(&top_cpuset.fmeter);
top_cpuset.mems_generation = cpuset_mems_generation++;
@ -1844,6 +1844,7 @@ void __init cpuset_init_smp(void)
* cpuset_cpus_allowed - return cpus_allowed mask from a tasks cpuset.
* @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed.
* @pmask: pointer to cpumask_t variable to receive cpus_allowed set.
*
* Description: Returns the cpumask_t cpus_allowed of the cpuset
* attached to the specified @tsk. Guaranteed to return some non-empty
@ -1851,35 +1852,27 @@ void __init cpuset_init_smp(void)
* tasks cpuset.
**/
cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
void cpuset_cpus_allowed(struct task_struct *tsk, cpumask_t *pmask)
{
cpumask_t mask;
mutex_lock(&callback_mutex);
mask = cpuset_cpus_allowed_locked(tsk);
cpuset_cpus_allowed_locked(tsk, pmask);
mutex_unlock(&callback_mutex);
return mask;
}
/**
* cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset.
* Must be called with callback_mutex held.
**/
cpumask_t cpuset_cpus_allowed_locked(struct task_struct *tsk)
void cpuset_cpus_allowed_locked(struct task_struct *tsk, cpumask_t *pmask)
{
cpumask_t mask;
task_lock(tsk);
guarantee_online_cpus(task_cs(tsk), &mask);
guarantee_online_cpus(task_cs(tsk), pmask);
task_unlock(tsk);
return mask;
}
void cpuset_init_current_mems_allowed(void)
{
current->mems_allowed = NODE_MASK_ALL;
nodes_setall(current->mems_allowed);
}
/**

8
kernel/sched.c
View File

@ -4941,13 +4941,13 @@ long sched_setaffinity(pid_t pid, cpumask_t new_mask)
if (retval)
goto out_unlock;
cpus_allowed = cpuset_cpus_allowed(p);
cpuset_cpus_allowed(p, &cpus_allowed);
cpus_and(new_mask, new_mask, cpus_allowed);
again:
retval = set_cpus_allowed(p, new_mask);
if (!retval) {
cpus_allowed = cpuset_cpus_allowed(p);
cpuset_cpus_allowed(p, &cpus_allowed);
if (!cpus_subset(new_mask, cpus_allowed)) {
/*
* We must have raced with a concurrent cpuset
@ -5661,7 +5661,9 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
/* No more Mr. Nice Guy. */
if (dest_cpu >= nr_cpu_ids) {
cpumask_t cpus_allowed = cpuset_cpus_allowed_locked(p);
cpumask_t cpus_allowed;
cpuset_cpus_allowed_locked(p, &cpus_allowed);
/*
* Try to stay on the same cpuset, where the
* current cpuset may be a subset of all cpus.

4
mm/pdflush.c
View File

@ -187,8 +187,8 @@ static int pdflush(void *dummy)
* This is needed as pdflush's are dynamically created and destroyed.
* The boottime pdflush's are easily placed w/o these 2 lines.
*/
cpus_allowed = cpuset_cpus_allowed(current);
set_cpus_allowed(current, cpus_allowed);
cpuset_cpus_allowed(current, &cpus_allowed);
set_cpus_allowed_ptr(current, &cpus_allowed);
return __pdflush(&my_work);
}