From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 4 Apr 2017 12:50:16 +0200
Subject: kernel: sched: Provide a pointer to the valid CPU mask
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Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: 1bd447a5e2d175b088b135a68511c2e2ff4d94c8
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension
In commit 4b53a3412d66 ("sched/core: Remove the tsk_nr_cpus_allowed()
wrapper") the tsk_nr_cpus_allowed() wrapper was removed. There was not
much difference in !RT but in RT we used this to implement
migrate_disable(). Within a migrate_disable() section the CPU mask is
restricted to single CPU while the "normal" CPU mask remains untouched.
As an alternative implementation Ingo suggested to use
struct task_struct {
const cpumask_t *cpus_ptr;
cpumask_t cpus_mask;
};
with
t->cpus_allowed_ptr = &t->cpus_allowed;
In -RT we then can switch the cpus_ptr to
t->cpus_allowed_ptr = &cpumask_of(task_cpu(p));
in a migration disabled region. The rules are simple:
- Code that 'uses' ->cpus_allowed would use the pointer.
- Code that 'modifies' ->cpus_allowed would use the direct mask.
While converting the existing users I tried to stick with the rules
above however… well mostly CPUFREQ tries to temporary switch the CPU
mask to do something on a certain CPU and then switches the mask back it
its original value. So in theory `cpus_ptr' could or should be used.
However if this is invoked in a migration disabled region (which is not
the case because it would require something like preempt_disable() and
set_cpus_allowed_ptr() might sleep so it can't be) then the "restore"
part would restore the wrong mask. So it only looks strange and I go for
the pointer…
Some drivers copy the cpumask without cpumask_copy() and others use
cpumask_copy but without alloc_cpumask_var(). I did not fix those as
part of this, could do this as a follow up…
So is this the way we want it?
Is the usage of `cpus_ptr' vs `cpus_mask' for the set + restore part
(see cpufreq users) what we want? At some point it looks like they
should use a different interface for their doing. I am not sure why
switching to certain CPU is important but maybe it could be done via a
workqueue from the CPUFREQ core (so we have a comment desribing why are
doing this and a get_online_cpus() to ensure that the CPU does not go
offline too early).
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
arch/ia64/kernel/mca.c | 2 +-
arch/mips/include/asm/switch_to.h | 4 +--
arch/mips/kernel/mips-mt-fpaff.c | 2 +-
arch/mips/kernel/traps.c | 6 ++--
arch/powerpc/platforms/cell/spufs/sched.c | 2 +-
arch/tile/include/asm/setup.h | 2 +-
arch/tile/kernel/hardwall.c | 10 +++---
arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 2 +-
drivers/infiniband/hw/hfi1/affinity.c | 6 ++--
drivers/infiniband/hw/hfi1/sdma.c | 3 +-
drivers/infiniband/hw/qib/qib_file_ops.c | 7 ++--
fs/proc/array.c | 4 +--
include/linux/init_task.h | 3 +-
include/linux/sched.h | 5 +--
kernel/cgroup/cpuset.c | 2 +-
kernel/fork.c | 2 ++
kernel/sched/core.c | 42 +++++++++++-----------
kernel/sched/cpudeadline.c | 4 +--
kernel/sched/cpupri.c | 4 +--
kernel/sched/deadline.c | 6 ++--
kernel/sched/fair.c | 32 ++++++++---------
kernel/sched/rt.c | 4 +--
kernel/trace/trace_hwlat.c | 2 +-
lib/smp_processor_id.c | 2 +-
samples/trace_events/trace-events-sample.c | 2 +-
25 files changed, 81 insertions(+), 79 deletions(-)
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1824,7 +1824,7 @@ format_mca_init_stack(void *mca_data, un
ti->cpu = cpu;
p->stack = ti;
p->state = TASK_UNINTERRUPTIBLE;
- cpumask_set_cpu(cpu, &p->cpus_allowed);
+ cpumask_set_cpu(cpu, &p->cpus_mask);
INIT_LIST_HEAD(&p->tasks);
p->parent = p->real_parent = p->group_leader = p;
INIT_LIST_HEAD(&p->children);
--- a/arch/mips/include/asm/switch_to.h
+++ b/arch/mips/include/asm/switch_to.h
@@ -42,7 +42,7 @@ extern struct task_struct *ll_task;
* inline to try to keep the overhead down. If we have been forced to run on
* a "CPU" with an FPU because of a previous high level of FP computation,
* but did not actually use the FPU during the most recent time-slice (CU1
- * isn't set), we undo the restriction on cpus_allowed.
+ * isn't set), we undo the restriction on cpus_mask.
*
* We're not calling set_cpus_allowed() here, because we have no need to
* force prompt migration - we're already switching the current CPU to a
@@ -57,7 +57,7 @@ do { \
test_ti_thread_flag(__prev_ti, TIF_FPUBOUND) && \
(!(KSTK_STATUS(prev) & ST0_CU1))) { \
clear_ti_thread_flag(__prev_ti, TIF_FPUBOUND); \
- prev->cpus_allowed = prev->thread.user_cpus_allowed; \
+ prev->cpus_mask = prev->thread.user_cpus_allowed; \
} \
next->thread.emulated_fp = 0; \
} while(0)
--- a/arch/mips/kernel/mips-mt-fpaff.c
+++ b/arch/mips/kernel/mips-mt-fpaff.c
@@ -176,7 +176,7 @@ asmlinkage long mipsmt_sys_sched_getaffi
if (retval)
goto out_unlock;
- cpumask_or(&allowed, &p->thread.user_cpus_allowed, &p->cpus_allowed);
+ cpumask_or(&allowed, &p->thread.user_cpus_allowed, p->cpus_ptr);
cpumask_and(&mask, &allowed, cpu_active_mask);
out_unlock:
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1193,12 +1193,12 @@ static void mt_ase_fp_affinity(void)
* restricted the allowed set to exclude any CPUs with FPUs,
* we'll skip the procedure.
*/
- if (cpumask_intersects(¤t->cpus_allowed, &mt_fpu_cpumask)) {
+ if (cpumask_intersects(¤t->cpus_mask, &mt_fpu_cpumask)) {
cpumask_t tmask;
current->thread.user_cpus_allowed
- = current->cpus_allowed;
- cpumask_and(&tmask, ¤t->cpus_allowed,
+ = current->cpus_mask;
+ cpumask_and(&tmask, ¤t->cpus_mask,
&mt_fpu_cpumask);
set_cpus_allowed_ptr(current, &tmask);
set_thread_flag(TIF_FPUBOUND);
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -141,7 +141,7 @@ void __spu_update_sched_info(struct spu_
* runqueue. The context will be rescheduled on the proper node
* if it is timesliced or preempted.
*/
- cpumask_copy(&ctx->cpus_allowed, ¤t->cpus_allowed);
+ cpumask_copy(&ctx->cpus_allowed, current->cpus_ptr);
/* Save the current cpu id for spu interrupt routing. */
ctx->last_ran = raw_smp_processor_id();
--- a/arch/tile/include/asm/setup.h
+++ b/arch/tile/include/asm/setup.h
@@ -49,7 +49,7 @@ int hardwall_ipi_valid(int cpu);
/* Hook hardwall code into changes in affinity. */
#define arch_set_cpus_allowed(p, new_mask) do { \
- if (!cpumask_equal(&p->cpus_allowed, new_mask)) \
+ if (!cpumask_equal(p->cpus_ptr, new_mask)) \
hardwall_deactivate_all(p); \
} while (0)
#endif
--- a/arch/tile/kernel/hardwall.c
+++ b/arch/tile/kernel/hardwall.c
@@ -590,12 +590,12 @@ static int hardwall_activate(struct hard
* Get our affinity; if we're not bound to this tile uniquely,
* we can't access the network registers.
*/
- if (cpumask_weight(&p->cpus_allowed) != 1)
+ if (p->nr_cpus_allowed != 1)
return -EPERM;
/* Make sure we are bound to a cpu assigned to this resource. */
cpu = smp_processor_id();
- BUG_ON(cpumask_first(&p->cpus_allowed) != cpu);
+ BUG_ON(cpumask_first(p->cpus_ptr) != cpu);
if (!cpumask_test_cpu(cpu, &info->cpumask))
return -EINVAL;
@@ -621,17 +621,17 @@ static int hardwall_activate(struct hard
* Deactivate a task's hardwall. Must hold lock for hardwall_type.
* This method may be called from exit_thread(), so we don't want to
* rely on too many fields of struct task_struct still being valid.
- * We assume the cpus_allowed, pid, and comm fields are still valid.
+ * We assume the nr_cpus_allowed, pid, and comm fields are still valid.
*/
static void _hardwall_deactivate(struct hardwall_type *hwt,
struct task_struct *task)
{
struct thread_struct *ts = &task->thread;
- if (cpumask_weight(&task->cpus_allowed) != 1) {
+ if (task->nr_cpus_allowed != 1) {
pr_err("pid %d (%s) releasing %s hardwall with an affinity mask containing %d cpus!\n",
task->pid, task->comm, hwt->name,
- cpumask_weight(&task->cpus_allowed));
+ task->nr_cpus_allowed);
BUG();
}
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -1503,7 +1503,7 @@ static int pseudo_lock_dev_mmap(struct f
* may be scheduled elsewhere and invalidate entries in the
* pseudo-locked region.
*/
- if (!cpumask_subset(¤t->cpus_allowed, &plr->d->cpu_mask)) {
+ if (!cpumask_subset(current->cpus_ptr, &plr->d->cpu_mask)) {
mutex_unlock(&rdtgroup_mutex);
return -EINVAL;
}
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -1039,7 +1039,7 @@ int hfi1_get_proc_affinity(int node)
struct hfi1_affinity_node *entry;
cpumask_var_t diff, hw_thread_mask, available_mask, intrs_mask;
const struct cpumask *node_mask,
- *proc_mask = ¤t->cpus_allowed;
+ *proc_mask = current->cpus_ptr;
struct hfi1_affinity_node_list *affinity = &node_affinity;
struct cpu_mask_set *set = &affinity->proc;
@@ -1047,7 +1047,7 @@ int hfi1_get_proc_affinity(int node)
* check whether process/context affinity has already
* been set
*/
- if (cpumask_weight(proc_mask) == 1) {
+ if (current->nr_cpus_allowed == 1) {
hfi1_cdbg(PROC, "PID %u %s affinity set to CPU %*pbl",
current->pid, current->comm,
cpumask_pr_args(proc_mask));
@@ -1058,7 +1058,7 @@ int hfi1_get_proc_affinity(int node)
cpu = cpumask_first(proc_mask);
cpumask_set_cpu(cpu, &set->used);
goto done;
- } else if (cpumask_weight(proc_mask) < cpumask_weight(&set->mask)) {
+ } else if (current->nr_cpus_allowed < cpumask_weight(&set->mask)) {
hfi1_cdbg(PROC, "PID %u %s affinity set to CPU set(s) %*pbl",
current->pid, current->comm,
cpumask_pr_args(proc_mask));
--- a/drivers/infiniband/hw/hfi1/sdma.c
+++ b/drivers/infiniband/hw/hfi1/sdma.c
@@ -869,14 +869,13 @@ struct sdma_engine *sdma_select_user_eng
{
struct sdma_rht_node *rht_node;
struct sdma_engine *sde = NULL;
- const struct cpumask *current_mask = ¤t->cpus_allowed;
unsigned long cpu_id;
/*
* To ensure that always the same sdma engine(s) will be
* selected make sure the process is pinned to this CPU only.
*/
- if (cpumask_weight(current_mask) != 1)
+ if (current->nr_cpus_allowed != 1)
goto out;
rcu_read_lock();
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -1142,7 +1142,7 @@ static unsigned int qib_poll(struct file
static void assign_ctxt_affinity(struct file *fp, struct qib_devdata *dd)
{
struct qib_filedata *fd = fp->private_data;
- const unsigned int weight = cpumask_weight(¤t->cpus_allowed);
+ const unsigned int weight = current->nr_cpus_allowed;
const struct cpumask *local_mask = cpumask_of_pcibus(dd->pcidev->bus);
int local_cpu;
@@ -1623,9 +1623,8 @@ static int qib_assign_ctxt(struct file *
ret = find_free_ctxt(i_minor - 1, fp, uinfo);
else {
int unit;
- const unsigned int cpu = cpumask_first(¤t->cpus_allowed);
- const unsigned int weight =
- cpumask_weight(¤t->cpus_allowed);
+ const unsigned int cpu = cpumask_first(current->cpus_ptr);
+ const unsigned int weight = current->nr_cpus_allowed;
if (weight == 1 && !test_bit(cpu, qib_cpulist))
if (!find_hca(cpu, &unit) && unit >= 0)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -390,9 +390,9 @@ static inline void task_context_switch_c
static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
{
seq_printf(m, "Cpus_allowed:\t%*pb\n",
- cpumask_pr_args(&task->cpus_allowed));
+ cpumask_pr_args(task->cpus_ptr));
seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
- cpumask_pr_args(&task->cpus_allowed));
+ cpumask_pr_args(task->cpus_ptr));
}
int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -239,7 +239,8 @@ extern struct cred init_cred;
.static_prio = MAX_PRIO-20, \
.normal_prio = MAX_PRIO-20, \
.policy = SCHED_NORMAL, \
- .cpus_allowed = CPU_MASK_ALL, \
+ .cpus_ptr = &tsk.cpus_mask, \
+ .cpus_mask = CPU_MASK_ALL, \
.nr_cpus_allowed= NR_CPUS, \
.mm = NULL, \
.active_mm = &init_mm, \
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -565,7 +565,8 @@ struct task_struct {
unsigned int policy;
int nr_cpus_allowed;
- cpumask_t cpus_allowed;
+ const cpumask_t *cpus_ptr;
+ cpumask_t cpus_mask;
#ifdef CONFIG_PREEMPT_RCU
int rcu_read_lock_nesting;
@@ -1263,7 +1264,7 @@ extern struct pid *cad_pid;
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
#define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
-#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
+#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -2094,7 +2094,7 @@ static void cpuset_fork(struct task_stru
if (task_css_is_root(task, cpuset_cgrp_id))
return;
- set_cpus_allowed_ptr(task, ¤t->cpus_allowed);
+ set_cpus_allowed_ptr(task, current->cpus_ptr);
task->mems_allowed = current->mems_allowed;
}
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -611,6 +611,8 @@ static struct task_struct *dup_task_stru
tsk->stack_canary = get_random_long();
#endif
+ if (orig->cpus_ptr == &orig->cpus_mask)
+ tsk->cpus_ptr = &tsk->cpus_mask;
/*
* One for us, one for whoever does the "release_task()" (usually
* parent)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1041,7 +1041,7 @@ static struct rq *__migrate_task(struct
return rq;
/* Affinity changed (again). */
- if (!cpumask_test_cpu(dest_cpu, &p->cpus_allowed))
+ if (!cpumask_test_cpu(dest_cpu, p->cpus_ptr))
return rq;
update_rq_clock(rq);
@@ -1069,7 +1069,7 @@ static int migration_cpu_stop(void *data
local_irq_disable();
/*
* We need to explicitly wake pending tasks before running
- * __migrate_task() such that we will not miss enforcing cpus_allowed
+ * __migrate_task() such that we will not miss enforcing cpus_ptr
* during wakeups, see set_cpus_allowed_ptr()'s TASK_WAKING test.
*/
sched_ttwu_pending();
@@ -1100,7 +1100,7 @@ static int migration_cpu_stop(void *data
*/
void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask)
{
- cpumask_copy(&p->cpus_allowed, new_mask);
+ cpumask_copy(&p->cpus_mask, new_mask);
p->nr_cpus_allowed = cpumask_weight(new_mask);
}
@@ -1170,7 +1170,7 @@ static int __set_cpus_allowed_ptr(struct
goto out;
}
- if (cpumask_equal(&p->cpus_allowed, new_mask))
+ if (cpumask_equal(p->cpus_ptr, new_mask))
goto out;
if (!cpumask_intersects(new_mask, cpu_valid_mask)) {
@@ -1328,10 +1328,10 @@ static int migrate_swap_stop(void *data)
if (task_cpu(arg->src_task) != arg->src_cpu)
goto unlock;
- if (!cpumask_test_cpu(arg->dst_cpu, &arg->src_task->cpus_allowed))
+ if (!cpumask_test_cpu(arg->dst_cpu, arg->src_task->cpus_ptr))
goto unlock;
- if (!cpumask_test_cpu(arg->src_cpu, &arg->dst_task->cpus_allowed))
+ if (!cpumask_test_cpu(arg->src_cpu, arg->dst_task->cpus_ptr))
goto unlock;
__migrate_swap_task(arg->src_task, arg->dst_cpu);
@@ -1373,10 +1373,10 @@ int migrate_swap(struct task_struct *cur
if (!cpu_active(arg.src_cpu) || !cpu_active(arg.dst_cpu))
goto out;
- if (!cpumask_test_cpu(arg.dst_cpu, &arg.src_task->cpus_allowed))
+ if (!cpumask_test_cpu(arg.dst_cpu, arg.src_task->cpus_ptr))
goto out;
- if (!cpumask_test_cpu(arg.src_cpu, &arg.dst_task->cpus_allowed))
+ if (!cpumask_test_cpu(arg.src_cpu, arg.dst_task->cpus_ptr))
goto out;
trace_sched_swap_numa(cur, arg.src_cpu, p, arg.dst_cpu);
@@ -1521,7 +1521,7 @@ void kick_process(struct task_struct *p)
EXPORT_SYMBOL_GPL(kick_process);
/*
- * ->cpus_allowed is protected by both rq->lock and p->pi_lock
+ * ->cpus_ptr is protected by both rq->lock and p->pi_lock
*
* A few notes on cpu_active vs cpu_online:
*
@@ -1561,14 +1561,14 @@ static int select_fallback_rq(int cpu, s
for_each_cpu(dest_cpu, nodemask) {
if (!cpu_active(dest_cpu))
continue;
- if (cpumask_test_cpu(dest_cpu, &p->cpus_allowed))
+ if (cpumask_test_cpu(dest_cpu, p->cpus_ptr))
return dest_cpu;
}
}
for (;;) {
/* Any allowed, online CPU? */
- for_each_cpu(dest_cpu, &p->cpus_allowed) {
+ for_each_cpu(dest_cpu, p->cpus_ptr) {
if (!(p->flags & PF_KTHREAD) && !cpu_active(dest_cpu))
continue;
if (!cpu_online(dest_cpu))
@@ -1613,7 +1613,7 @@ out:
}
/*
- * The caller (fork, wakeup) owns p->pi_lock, ->cpus_allowed is stable.
+ * The caller (fork, wakeup) owns p->pi_lock, ->cpus_ptr is stable.
*/
static inline
int select_task_rq(struct task_struct *p, int cpu, int sd_flags, int wake_flags)
@@ -1623,11 +1623,11 @@ int select_task_rq(struct task_struct *p
if (p->nr_cpus_allowed > 1)
cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags);
else
- cpu = cpumask_any(&p->cpus_allowed);
+ cpu = cpumask_any(p->cpus_ptr);
/*
* In order not to call set_task_cpu() on a blocking task we need
- * to rely on ttwu() to place the task on a valid ->cpus_allowed
+ * to rely on ttwu() to place the task on a valid ->cpus_ptr
* CPU.
*
* Since this is common to all placement strategies, this lives here.
@@ -1635,7 +1635,7 @@ int select_task_rq(struct task_struct *p
* [ this allows ->select_task() to simply return task_cpu(p) and
* not worry about this generic constraint ]
*/
- if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed) ||
+ if (unlikely(!cpumask_test_cpu(cpu, p->cpus_ptr) ||
!cpu_online(cpu)))
cpu = select_fallback_rq(task_cpu(p), p);
@@ -2585,7 +2585,7 @@ void wake_up_new_task(struct task_struct
#ifdef CONFIG_SMP
/*
* Fork balancing, do it here and not earlier because:
- * - cpus_allowed can change in the fork path
+ * - cpus_ptr can change in the fork path
* - any previously selected CPU might disappear through hotplug
*
* Use __set_task_cpu() to avoid calling sched_class::migrate_task_rq,
@@ -4384,7 +4384,7 @@ change:
* the entire root_domain to become SCHED_DEADLINE. We
* will also fail if there's no bandwidth available.
*/
- if (!cpumask_subset(span, &p->cpus_allowed) ||
+ if (!cpumask_subset(span, p->cpus_ptr) ||
rq->rd->dl_bw.bw == 0) {
task_rq_unlock(rq, p, &rf);
return -EPERM;
@@ -4978,7 +4978,7 @@ long sched_getaffinity(pid_t pid, struct
goto out_unlock;
raw_spin_lock_irqsave(&p->pi_lock, flags);
- cpumask_and(mask, &p->cpus_allowed, cpu_active_mask);
+ cpumask_and(mask, &p->cpus_mask, cpu_active_mask);
raw_spin_unlock_irqrestore(&p->pi_lock, flags);
out_unlock:
@@ -5542,7 +5542,7 @@ int task_can_attach(struct task_struct *
* allowed nodes is unnecessary. Thus, cpusets are not
* applicable for such threads. This prevents checking for
* success of set_cpus_allowed_ptr() on all attached tasks
- * before cpus_allowed may be changed.
+ * before cpus_mask may be changed.
*/
if (p->flags & PF_NO_SETAFFINITY) {
ret = -EINVAL;
@@ -5598,7 +5598,7 @@ int migrate_task_to(struct task_struct *
if (curr_cpu == target_cpu)
return 0;
- if (!cpumask_test_cpu(target_cpu, &p->cpus_allowed))
+ if (!cpumask_test_cpu(target_cpu, p->cpus_ptr))
return -EINVAL;
/* TODO: This is not properly updating schedstats */
@@ -5735,7 +5735,7 @@ static void migrate_tasks(struct rq *dea
put_prev_task(rq, next);
/*
- * Rules for changing task_struct::cpus_allowed are holding
+ * Rules for changing task_struct::cpus_mask are holding
* both pi_lock and rq->lock, such that holding either
* stabilizes the mask.
*
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -128,10 +128,10 @@ int cpudl_find(struct cpudl *cp, struct
const struct sched_dl_entity *dl_se = &p->dl;
if (later_mask &&
- cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) {
+ cpumask_and(later_mask, cp->free_cpus, p->cpus_ptr)) {
best_cpu = cpumask_any(later_mask);
goto out;
- } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) &&
+ } else if (cpumask_test_cpu(cpudl_maximum(cp), p->cpus_ptr) &&
dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
best_cpu = cpudl_maximum(cp);
if (later_mask)
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -103,11 +103,11 @@ int cpupri_find(struct cpupri *cp, struc
if (skip)
continue;
- if (cpumask_any_and(&p->cpus_allowed, vec->mask) >= nr_cpu_ids)
+ if (cpumask_any_and(p->cpus_ptr, vec->mask) >= nr_cpu_ids)
continue;
if (lowest_mask) {
- cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask);
+ cpumask_and(lowest_mask, p->cpus_ptr, vec->mask);
/*
* We have to ensure that we have at least one bit
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -250,7 +250,7 @@ static struct rq *dl_task_offline_migrat
* If we cannot preempt any rq, fall back to pick any
* online cpu.
*/
- cpu = cpumask_any_and(cpu_active_mask, &p->cpus_allowed);
+ cpu = cpumask_any_and(cpu_active_mask, p->cpus_ptr);
if (cpu >= nr_cpu_ids) {
/*
* Fail to find any suitable cpu.
@@ -1276,7 +1276,7 @@ static void set_curr_task_dl(struct rq *
static int pick_dl_task(struct rq *rq, struct task_struct *p, int cpu)
{
if (!task_running(rq, p) &&
- cpumask_test_cpu(cpu, &p->cpus_allowed))
+ cpumask_test_cpu(cpu, p->cpus_ptr))
return 1;
return 0;
}
@@ -1425,7 +1425,7 @@ static struct rq *find_lock_later_rq(str
/* Retry if something changed. */
if (double_lock_balance(rq, later_rq)) {
if (unlikely(task_rq(task) != rq ||
- !cpumask_test_cpu(later_rq->cpu, &task->cpus_allowed) ||
+ !cpumask_test_cpu(later_rq->cpu, task->cpus_ptr) ||
task_running(rq, task) ||
!dl_task(task) ||
!task_on_rq_queued(task))) {
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1684,7 +1684,7 @@ static void task_numa_compare(struct tas
* be incurred if the tasks were swapped.
*/
/* Skip this swap candidate if cannot move to the source cpu */
- if (!cpumask_test_cpu(env->src_cpu, &cur->cpus_allowed))
+ if (!cpumask_test_cpu(env->src_cpu, cur->cpus_ptr))
goto unlock;
/*
@@ -1782,7 +1782,7 @@ static void task_numa_find_cpu(struct ta
for_each_cpu(cpu, cpumask_of_node(env->dst_nid)) {
/* Skip this CPU if the source task cannot migrate */
- if (!cpumask_test_cpu(cpu, &env->p->cpus_allowed))
+ if (!cpumask_test_cpu(cpu, env->p->cpus_ptr))
continue;
env->dst_cpu = cpu;
@@ -6020,7 +6020,7 @@ find_idlest_group(struct sched_domain *s
/* Skip over this group if it has no CPUs allowed */
if (!cpumask_intersects(sched_group_span(group),
- &p->cpus_allowed))
+ p->cpus_ptr))
continue;
local_group = cpumask_test_cpu(this_cpu,
@@ -6152,7 +6152,7 @@ find_idlest_group_cpu(struct sched_group
return cpumask_first(sched_group_span(group));
/* Traverse only the allowed CPUs */
- for_each_cpu_and(i, sched_group_span(group), &p->cpus_allowed) {
+ for_each_cpu_and(i, sched_group_span(group), p->cpus_ptr) {
if (idle_cpu(i)) {
struct rq *rq = cpu_rq(i);
struct cpuidle_state *idle = idle_get_state(rq);
@@ -6192,7 +6192,7 @@ static inline int find_idlest_cpu(struct
{
int new_cpu = cpu;
- if (!cpumask_intersects(sched_domain_span(sd), &p->cpus_allowed))
+ if (!cpumask_intersects(sched_domain_span(sd), p->cpus_ptr))
return prev_cpu;
while (sd) {
@@ -6302,7 +6302,7 @@ static int select_idle_core(struct task_
if (!test_idle_cores(target, false))
return -1;
- cpumask_and(cpus, sched_domain_span(sd), &p->cpus_allowed);
+ cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
for_each_cpu_wrap(core, cpus, target) {
bool idle = true;
@@ -6336,7 +6336,7 @@ static int select_idle_smt(struct task_s
return -1;
for_each_cpu(cpu, cpu_smt_mask(target)) {
- if (!cpumask_test_cpu(cpu, &p->cpus_allowed) ||
+ if (!cpumask_test_cpu(cpu, p->cpus_ptr) ||
!cpumask_test_cpu(cpu, sched_domain_span(sd)))
continue;
if (idle_cpu(cpu))
@@ -6400,7 +6400,7 @@ static int select_idle_cpu(struct task_s
for_each_cpu_wrap(cpu, sched_domain_span(sd), target) {
if (!--nr)
return -1;
- if (!cpumask_test_cpu(cpu, &p->cpus_allowed))
+ if (!cpumask_test_cpu(cpu, p->cpus_ptr))
continue;
if (idle_cpu(cpu))
break;
@@ -6437,7 +6437,7 @@ static int select_idle_sibling(struct ta
recent_used_cpu != target &&
cpus_share_cache(recent_used_cpu, target) &&
idle_cpu(recent_used_cpu) &&
- cpumask_test_cpu(p->recent_used_cpu, &p->cpus_allowed)) {
+ cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr)) {
/*
* Replace recent_used_cpu with prev as it is a potential
* candidate for the next wake.
@@ -6570,7 +6570,7 @@ select_task_rq_fair(struct task_struct *
if (sd_flag & SD_BALANCE_WAKE) {
record_wakee(p);
want_affine = !wake_wide(p) && !wake_cap(p, cpu, prev_cpu)
- && cpumask_test_cpu(cpu, &p->cpus_allowed);
+ && cpumask_test_cpu(cpu, p->cpus_ptr);
}
rcu_read_lock();
@@ -7315,14 +7315,14 @@ int can_migrate_task(struct task_struct
/*
* We do not migrate tasks that are:
* 1) throttled_lb_pair, or
- * 2) cannot be migrated to this CPU due to cpus_allowed, or
+ * 2) cannot be migrated to this CPU due to cpus_ptr, or
* 3) running (obviously), or
* 4) are cache-hot on their current CPU.
*/
if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu))
return 0;
- if (!cpumask_test_cpu(env->dst_cpu, &p->cpus_allowed)) {
+ if (!cpumask_test_cpu(env->dst_cpu, p->cpus_ptr)) {
int cpu;
schedstat_inc(p->se.statistics.nr_failed_migrations_affine);
@@ -7342,7 +7342,7 @@ int can_migrate_task(struct task_struct
/* Prevent to re-select dst_cpu via env's cpus */
for_each_cpu_and(cpu, env->dst_grpmask, env->cpus) {
- if (cpumask_test_cpu(cpu, &p->cpus_allowed)) {
+ if (cpumask_test_cpu(cpu, p->cpus_ptr)) {
env->flags |= LBF_DST_PINNED;
env->new_dst_cpu = cpu;
break;
@@ -7907,7 +7907,7 @@ check_cpu_capacity(struct rq *rq, struct
/*
* Group imbalance indicates (and tries to solve) the problem where balancing
- * groups is inadequate due to ->cpus_allowed constraints.
+ * groups is inadequate due to ->cpus_ptr constraints.
*
* Imagine a situation of two groups of 4 cpus each and 4 tasks each with a
* cpumask covering 1 cpu of the first group and 3 cpus of the second group.
@@ -8483,7 +8483,7 @@ static struct sched_group *find_busiest_
/*
* If the busiest group is imbalanced the below checks don't
* work because they assume all things are equal, which typically
- * isn't true due to cpus_allowed constraints and the like.
+ * isn't true due to cpus_ptr constraints and the like.
*/
if (busiest->group_type == group_imbalanced)
goto force_balance;
@@ -8868,7 +8868,7 @@ more_balance:
* if the curr task on busiest cpu can't be
* moved to this_cpu
*/
- if (!cpumask_test_cpu(this_cpu, &busiest->curr->cpus_allowed)) {
+ if (!cpumask_test_cpu(this_cpu, busiest->curr->cpus_ptr)) {
raw_spin_unlock_irqrestore(&busiest->lock,
flags);
env.flags |= LBF_ALL_PINNED;
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1582,7 +1582,7 @@ static void put_prev_task_rt(struct rq *
static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
{
if (!task_running(rq, p) &&
- cpumask_test_cpu(cpu, &p->cpus_allowed))
+ cpumask_test_cpu(cpu, p->cpus_ptr))
return 1;
return 0;
}
@@ -1717,7 +1717,7 @@ static struct rq *find_lock_lowest_rq(st
* Also make sure that it wasn't scheduled on its rq.
*/
if (unlikely(task_rq(task) != rq ||
- !cpumask_test_cpu(lowest_rq->cpu, &task->cpus_allowed) ||
+ !cpumask_test_cpu(lowest_rq->cpu, task->cpus_ptr) ||
task_running(rq, task) ||
!rt_task(task) ||
!task_on_rq_queued(task))) {
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -279,7 +279,7 @@ static void move_to_next_cpu(void)
* of this thread, than stop migrating for the duration
* of the current test.
*/
- if (!cpumask_equal(current_mask, ¤t->cpus_allowed))
+ if (!cpumask_equal(current_mask, current->cpus_ptr))
goto disable;
get_online_cpus();
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -22,7 +22,7 @@ notrace static unsigned int check_preemp
* Kernel threads bound to a single CPU can safely use
* smp_processor_id():
*/
- if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu)))
+ if (cpumask_equal(current->cpus_ptr, cpumask_of(this_cpu)))
goto out;
/*
--- a/samples/trace_events/trace-events-sample.c
+++ b/samples/trace_events/trace-events-sample.c
@@ -33,7 +33,7 @@ static void simple_thread_func(int cnt)
/* Silly tracepoints */
trace_foo_bar("hello", cnt, array, random_strings[len],
- ¤t->cpus_allowed);
+ current->cpus_ptr);
trace_foo_with_template_simple("HELLO", cnt);