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Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c60
1 files changed, 27 insertions, 33 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 3d54c418bd06..f6b33c696224 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -61,12 +61,7 @@
#include <linux/cgroup.h>
#include <linux/wait.h>
-/*
- * Tracks how many cpusets are currently defined in system.
- * When there is only one cpuset (the root cpuset) we can
- * short circuit some hooks.
- */
-int number_of_cpusets __read_mostly;
+struct static_key cpusets_enabled_key __read_mostly = STATIC_KEY_INIT_FALSE;
/* See "Frequency meter" comments, below. */
@@ -124,7 +119,7 @@ static inline struct cpuset *task_cs(struct task_struct *task)
static inline struct cpuset *parent_cs(struct cpuset *cs)
{
- return css_cs(css_parent(&cs->css));
+ return css_cs(cs->css.parent);
}
#ifdef CONFIG_NUMA
@@ -611,7 +606,7 @@ static int generate_sched_domains(cpumask_var_t **domains,
goto done;
}
- csa = kmalloc(number_of_cpusets * sizeof(cp), GFP_KERNEL);
+ csa = kmalloc(nr_cpusets() * sizeof(cp), GFP_KERNEL);
if (!csa)
goto done;
csn = 0;
@@ -696,11 +691,8 @@ restart:
if (nslot == ndoms) {
static int warnings = 10;
if (warnings) {
- printk(KERN_WARNING
- "rebuild_sched_domains confused:"
- " nslot %d, ndoms %d, csn %d, i %d,"
- " apn %d\n",
- nslot, ndoms, csn, i, apn);
+ pr_warn("rebuild_sched_domains confused: nslot %d, ndoms %d, csn %d, i %d, apn %d\n",
+ nslot, ndoms, csn, i, apn);
warnings--;
}
continue;
@@ -875,7 +867,7 @@ static void update_tasks_cpumask_hier(struct cpuset *root_cs, bool update_root)
continue;
}
}
- if (!css_tryget(&cp->css))
+ if (!css_tryget_online(&cp->css))
continue;
rcu_read_unlock();
@@ -890,6 +882,7 @@ static void update_tasks_cpumask_hier(struct cpuset *root_cs, bool update_root)
/**
* update_cpumask - update the cpus_allowed mask of a cpuset and all tasks in it
* @cs: the cpuset to consider
+ * @trialcs: trial cpuset
* @buf: buffer of cpu numbers written to this cpuset
*/
static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
@@ -1110,7 +1103,7 @@ static void update_tasks_nodemask_hier(struct cpuset *root_cs, bool update_root)
continue;
}
}
- if (!css_tryget(&cp->css))
+ if (!css_tryget_online(&cp->css))
continue;
rcu_read_unlock();
@@ -1605,13 +1598,15 @@ out_unlock:
/*
* Common handling for a write to a "cpus" or "mems" file.
*/
-static int cpuset_write_resmask(struct cgroup_subsys_state *css,
- struct cftype *cft, char *buf)
+static ssize_t cpuset_write_resmask(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
{
- struct cpuset *cs = css_cs(css);
+ struct cpuset *cs = css_cs(of_css(of));
struct cpuset *trialcs;
int retval = -ENODEV;
+ buf = strstrip(buf);
+
/*
* CPU or memory hotunplug may leave @cs w/o any execution
* resources, in which case the hotplug code asynchronously updates
@@ -1635,7 +1630,7 @@ static int cpuset_write_resmask(struct cgroup_subsys_state *css,
goto out_unlock;
}
- switch (cft->private) {
+ switch (of_cft(of)->private) {
case FILE_CPULIST:
retval = update_cpumask(cs, trialcs, buf);
break;
@@ -1650,7 +1645,7 @@ static int cpuset_write_resmask(struct cgroup_subsys_state *css,
free_trial_cpuset(trialcs);
out_unlock:
mutex_unlock(&cpuset_mutex);
- return retval;
+ return retval ?: nbytes;
}
/*
@@ -1752,7 +1747,7 @@ static struct cftype files[] = {
{
.name = "cpus",
.seq_show = cpuset_common_seq_show,
- .write_string = cpuset_write_resmask,
+ .write = cpuset_write_resmask,
.max_write_len = (100U + 6 * NR_CPUS),
.private = FILE_CPULIST,
},
@@ -1760,7 +1755,7 @@ static struct cftype files[] = {
{
.name = "mems",
.seq_show = cpuset_common_seq_show,
- .write_string = cpuset_write_resmask,
+ .write = cpuset_write_resmask,
.max_write_len = (100U + 6 * MAX_NUMNODES),
.private = FILE_MEMLIST,
},
@@ -1888,7 +1883,7 @@ static int cpuset_css_online(struct cgroup_subsys_state *css)
if (is_spread_slab(parent))
set_bit(CS_SPREAD_SLAB, &cs->flags);
- number_of_cpusets++;
+ cpuset_inc();
if (!test_bit(CGRP_CPUSET_CLONE_CHILDREN, &css->cgroup->flags))
goto out_unlock;
@@ -1939,7 +1934,7 @@ static void cpuset_css_offline(struct cgroup_subsys_state *css)
if (is_sched_load_balance(cs))
update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
- number_of_cpusets--;
+ cpuset_dec();
clear_bit(CS_ONLINE, &cs->flags);
mutex_unlock(&cpuset_mutex);
@@ -1992,7 +1987,6 @@ int __init cpuset_init(void)
if (!alloc_cpumask_var(&cpus_attach, GFP_KERNEL))
BUG();
- number_of_cpusets = 1;
return 0;
}
@@ -2017,7 +2011,7 @@ static void remove_tasks_in_empty_cpuset(struct cpuset *cs)
parent = parent_cs(parent);
if (cgroup_transfer_tasks(parent->css.cgroup, cs->css.cgroup)) {
- printk(KERN_ERR "cpuset: failed to transfer tasks out of empty cpuset ");
+ pr_err("cpuset: failed to transfer tasks out of empty cpuset ");
pr_cont_cgroup_name(cs->css.cgroup);
pr_cont("\n");
}
@@ -2155,7 +2149,7 @@ static void cpuset_hotplug_workfn(struct work_struct *work)
rcu_read_lock();
cpuset_for_each_descendant_pre(cs, pos_css, &top_cpuset) {
- if (cs == &top_cpuset || !css_tryget(&cs->css))
+ if (cs == &top_cpuset || !css_tryget_online(&cs->css))
continue;
rcu_read_unlock();
@@ -2536,7 +2530,7 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
/**
* cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed
- * @task: pointer to task_struct of some task.
+ * @tsk: pointer to task_struct of some task.
*
* Description: Prints @task's name, cpuset name, and cached copy of its
* mems_allowed to the kernel log.
@@ -2554,7 +2548,7 @@ void cpuset_print_task_mems_allowed(struct task_struct *tsk)
cgrp = task_cs(tsk)->css.cgroup;
nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
tsk->mems_allowed);
- printk(KERN_INFO "%s cpuset=", tsk->comm);
+ pr_info("%s cpuset=", tsk->comm);
pr_cont_cgroup_name(cgrp);
pr_cont(" mems_allowed=%s\n", cpuset_nodelist);
@@ -2646,10 +2640,10 @@ out:
/* Display task mems_allowed in /proc/<pid>/status file. */
void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task)
{
- seq_printf(m, "Mems_allowed:\t");
+ seq_puts(m, "Mems_allowed:\t");
seq_nodemask(m, &task->mems_allowed);
- seq_printf(m, "\n");
- seq_printf(m, "Mems_allowed_list:\t");
+ seq_puts(m, "\n");
+ seq_puts(m, "Mems_allowed_list:\t");
seq_nodemask_list(m, &task->mems_allowed);
- seq_printf(m, "\n");
+ seq_puts(m, "\n");
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-13 20:36:44 +0000