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authorLinus Torvalds <torvalds@linux-foundation.org>2014-06-09 15:03:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-09 15:03:33 -0700
commit14208b0ec56919f5333dd654b1a7d10765d0ad05 (patch)
tree474b46c351efced45925d15dc2e0049c49784716 /kernel/cpuset.c
parent6ea4fa70e4af0da8b133b246458fb789d8cb3985 (diff)
parentc731ae1d0f02a300697a8b1564780ad28a6c2013 (diff)
Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup updates from Tejun Heo: "A lot of activities on cgroup side. Heavy restructuring including locking simplification took place to improve the code base and enable implementation of the unified hierarchy, which currently exists behind a __DEVEL__ mount option. The core support is mostly complete but individual controllers need further work. To explain the design and rationales of the the unified hierarchy Documentation/cgroups/unified-hierarchy.txt is added. Another notable change is css (cgroup_subsys_state - what each controller uses to identify and interact with a cgroup) iteration update. This is part of continuing updates on css object lifetime and visibility. cgroup started with reference count draining on removal way back and is now reaching a point where csses behave and are iterated like normal refcnted objects albeit with some complexities to allow distinguishing the state where they're being deleted. The css iteration update isn't taken advantage of yet but is planned to be used to simplify memcg significantly" * 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (77 commits) cgroup: disallow disabled controllers on the default hierarchy cgroup: don't destroy the default root cgroup: disallow debug controller on the default hierarchy cgroup: clean up MAINTAINERS entries cgroup: implement css_tryget() device_cgroup: use css_has_online_children() instead of has_children() cgroup: convert cgroup_has_live_children() into css_has_online_children() cgroup: use CSS_ONLINE instead of CGRP_DEAD cgroup: iterate cgroup_subsys_states directly cgroup: introduce CSS_RELEASED and reduce css iteration fallback window cgroup: move cgroup->serial_nr into cgroup_subsys_state cgroup: link all cgroup_subsys_states in their sibling lists cgroup: move cgroup->sibling and ->children into cgroup_subsys_state cgroup: remove cgroup->parent device_cgroup: remove direct access to cgroup->children memcg: update memcg_has_children() to use css_next_child() memcg: remove tasks/children test from mem_cgroup_force_empty() cgroup: remove css_parent() cgroup: skip refcnting on normal root csses and cgrp_dfl_root self css cgroup: use cgroup->self.refcnt for cgroup refcnting ...
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c46
1 files changed, 23 insertions, 23 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 130017843899..f6b33c696224 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -119,7 +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
@@ -691,11 +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;
@@ -870,7 +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();
@@ -885,6 +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,
@@ -1105,7 +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();
@@ -1600,13 +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
@@ -1630,7 +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;
@@ -1645,7 +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;
}
/*
@@ -1747,7 +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,
},
@@ -1755,7 +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,
},
@@ -2011,7 +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");
}
@@ -2149,7 +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();
@@ -2530,7 +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.
@@ -2548,7 +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);
@@ -2640,10 +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");
}