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-rw-r--r--include/linux/cgroup.h6
-rw-r--r--kernel/cgroup/cgroup-v1.c6
-rw-r--r--kernel/cgroup/cgroup.c24
-rw-r--r--kernel/cgroup/cpuset.c6
-rw-r--r--kernel/cgroup/freezer.c6
-rw-r--r--mm/memcontrol.c2
-rw-r--r--net/core/netclassid_cgroup.c2
7 files changed, 30 insertions, 22 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 308b10797a54..cae5831ae650 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -36,9 +36,13 @@
#define CGROUP_WEIGHT_DFL 100
#define CGROUP_WEIGHT_MAX 10000
+/* walk only threadgroup leaders */
+#define CSS_TASK_ITER_PROCS (1U << 0)
+
/* a css_task_iter should be treated as an opaque object */
struct css_task_iter {
struct cgroup_subsys *ss;
+ unsigned int flags;
struct list_head *cset_pos;
struct list_head *cset_head;
@@ -129,7 +133,7 @@ struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
struct cgroup_subsys_state **dst_cssp);
-void css_task_iter_start(struct cgroup_subsys_state *css,
+void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
struct css_task_iter *it);
struct task_struct *css_task_iter_next(struct css_task_iter *it);
void css_task_iter_end(struct css_task_iter *it);
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 60f72475863e..167aaab04bf9 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -121,7 +121,7 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
* ->can_attach() fails.
*/
do {
- css_task_iter_start(&from->self, &it);
+ css_task_iter_start(&from->self, 0, &it);
task = css_task_iter_next(&it);
if (task)
get_task_struct(task);
@@ -373,7 +373,7 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
if (!array)
return -ENOMEM;
/* now, populate the array */
- css_task_iter_start(&cgrp->self, &it);
+ css_task_iter_start(&cgrp->self, 0, &it);
while ((tsk = css_task_iter_next(&it))) {
if (unlikely(n == length))
break;
@@ -749,7 +749,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
}
rcu_read_unlock();
- css_task_iter_start(&cgrp->self, &it);
+ css_task_iter_start(&cgrp->self, 0, &it);
while ((tsk = css_task_iter_next(&it))) {
switch (tsk->state) {
case TASK_RUNNING:
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index e3bda0752501..3c5a37a9a892 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -3643,6 +3643,7 @@ static void css_task_iter_advance(struct css_task_iter *it)
lockdep_assert_held(&css_set_lock);
WARN_ON_ONCE(!l);
+repeat:
/*
* Advance iterator to find next entry. cset->tasks is consumed
* first and then ->mg_tasks. After ->mg_tasks, we move onto the
@@ -3657,11 +3658,18 @@ static void css_task_iter_advance(struct css_task_iter *it)
css_task_iter_advance_css_set(it);
else
it->task_pos = l;
+
+ /* if PROCS, skip over tasks which aren't group leaders */
+ if ((it->flags & CSS_TASK_ITER_PROCS) && it->task_pos &&
+ !thread_group_leader(list_entry(it->task_pos, struct task_struct,
+ cg_list)))
+ goto repeat;
}
/**
* css_task_iter_start - initiate task iteration
* @css: the css to walk tasks of
+ * @flags: CSS_TASK_ITER_* flags
* @it: the task iterator to use
*
* Initiate iteration through the tasks of @css. The caller can call
@@ -3669,7 +3677,7 @@ static void css_task_iter_advance(struct css_task_iter *it)
* returns NULL. On completion of iteration, css_task_iter_end() must be
* called.
*/
-void css_task_iter_start(struct cgroup_subsys_state *css,
+void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,
struct css_task_iter *it)
{
/* no one should try to iterate before mounting cgroups */
@@ -3680,6 +3688,7 @@ void css_task_iter_start(struct cgroup_subsys_state *css,
spin_lock_irq(&css_set_lock);
it->ss = css->ss;
+ it->flags = flags;
if (it->ss)
it->cset_pos = &css->cgroup->e_csets[css->ss->id];
@@ -3753,13 +3762,8 @@ static void *cgroup_procs_next(struct seq_file *s, void *v, loff_t *pos)
{
struct kernfs_open_file *of = s->private;
struct css_task_iter *it = of->priv;
- struct task_struct *task;
-
- do {
- task = css_task_iter_next(it);
- } while (task && !thread_group_leader(task));
- return task;
+ return css_task_iter_next(it);
}
static void *cgroup_procs_start(struct seq_file *s, loff_t *pos)
@@ -3780,10 +3784,10 @@ static void *cgroup_procs_start(struct seq_file *s, loff_t *pos)
if (!it)
return ERR_PTR(-ENOMEM);
of->priv = it;
- css_task_iter_start(&cgrp->self, it);
+ css_task_iter_start(&cgrp->self, CSS_TASK_ITER_PROCS, it);
} else if (!(*pos)++) {
css_task_iter_end(it);
- css_task_iter_start(&cgrp->self, it);
+ css_task_iter_start(&cgrp->self, CSS_TASK_ITER_PROCS, it);
}
return cgroup_procs_next(s, NULL, NULL);
@@ -3791,7 +3795,7 @@ static void *cgroup_procs_start(struct seq_file *s, loff_t *pos)
static int cgroup_procs_show(struct seq_file *s, void *v)
{
- seq_printf(s, "%d\n", task_tgid_vnr(v));
+ seq_printf(s, "%d\n", task_pid_vnr(v));
return 0;
}
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index ca8376e5008c..252d70c9a49b 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -861,7 +861,7 @@ static void update_tasks_cpumask(struct cpuset *cs)
struct css_task_iter it;
struct task_struct *task;
- css_task_iter_start(&cs->css, &it);
+ css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it)))
set_cpus_allowed_ptr(task, cs->effective_cpus);
css_task_iter_end(&it);
@@ -1091,7 +1091,7 @@ static void update_tasks_nodemask(struct cpuset *cs)
* It's ok if we rebind the same mm twice; mpol_rebind_mm()
* is idempotent. Also migrate pages in each mm to new nodes.
*/
- css_task_iter_start(&cs->css, &it);
+ css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it))) {
struct mm_struct *mm;
bool migrate;
@@ -1284,7 +1284,7 @@ static void update_tasks_flags(struct cpuset *cs)
struct css_task_iter it;
struct task_struct *task;
- css_task_iter_start(&cs->css, &it);
+ css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it)))
cpuset_update_task_spread_flag(cs, task);
css_task_iter_end(&it);
diff --git a/kernel/cgroup/freezer.c b/kernel/cgroup/freezer.c
index 1b72d56edce5..08236798d173 100644
--- a/kernel/cgroup/freezer.c
+++ b/kernel/cgroup/freezer.c
@@ -268,7 +268,7 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
rcu_read_unlock();
/* are all tasks frozen? */
- css_task_iter_start(css, &it);
+ css_task_iter_start(css, 0, &it);
while ((task = css_task_iter_next(&it))) {
if (freezing(task)) {
@@ -320,7 +320,7 @@ static void freeze_cgroup(struct freezer *freezer)
struct css_task_iter it;
struct task_struct *task;
- css_task_iter_start(&freezer->css, &it);
+ css_task_iter_start(&freezer->css, 0, &it);
while ((task = css_task_iter_next(&it)))
freeze_task(task);
css_task_iter_end(&it);
@@ -331,7 +331,7 @@ static void unfreeze_cgroup(struct freezer *freezer)
struct css_task_iter it;
struct task_struct *task;
- css_task_iter_start(&freezer->css, &it);
+ css_task_iter_start(&freezer->css, 0, &it);
while ((task = css_task_iter_next(&it)))
__thaw_task(task);
css_task_iter_end(&it);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3df3c04d73ab..2b2f071f914b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -917,7 +917,7 @@ int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
struct css_task_iter it;
struct task_struct *task;
- css_task_iter_start(&iter->css, &it);
+ css_task_iter_start(&iter->css, 0, &it);
while (!ret && (task = css_task_iter_next(&it)))
ret = fn(task, arg);
css_task_iter_end(&it);
diff --git a/net/core/netclassid_cgroup.c b/net/core/netclassid_cgroup.c
index 029a61ac6cdd..5e4f04004a49 100644
--- a/net/core/netclassid_cgroup.c
+++ b/net/core/netclassid_cgroup.c
@@ -100,7 +100,7 @@ static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft,
cs->classid = (u32)value;
- css_task_iter_start(css, &it);
+ css_task_iter_start(css, 0, &it);
while ((p = css_task_iter_next(&it))) {
task_lock(p);
iterate_fd(p->files, 0, update_classid_sock,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 22:49:21 +0100