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Diffstat (limited to 'kernel/cgroup/debug.c')
-rw-r--r--kernel/cgroup/debug.c53
1 files changed, 39 insertions, 14 deletions
diff --git a/kernel/cgroup/debug.c b/kernel/cgroup/debug.c
index dac46af22782..f661b4cc5efd 100644
--- a/kernel/cgroup/debug.c
+++ b/kernel/cgroup/debug.c
@@ -114,27 +114,49 @@ static int cgroup_css_links_read(struct seq_file *seq, void *v)
{
struct cgroup_subsys_state *css = seq_css(seq);
struct cgrp_cset_link *link;
- int dead_cnt = 0, extra_refs = 0;
+ int dead_cnt = 0, extra_refs = 0, threaded_csets = 0;
spin_lock_irq(&css_set_lock);
+
list_for_each_entry(link, &css->cgroup->cset_links, cset_link) {
struct css_set *cset = link->cset;
struct task_struct *task;
int count = 0;
int refcnt = refcount_read(&cset->refcount);
- seq_printf(seq, " %d", refcnt);
- if (refcnt - cset->nr_tasks > 0) {
- int extra = refcnt - cset->nr_tasks;
-
- seq_printf(seq, " +%d", extra);
- /*
- * Take out the one additional reference in
- * init_css_set.
- */
- if (cset == &init_css_set)
- extra--;
- extra_refs += extra;
+ /*
+ * Print out the proc_cset and threaded_cset relationship
+ * and highlight difference between refcount and task_count.
+ */
+ seq_printf(seq, "css_set %pK", cset);
+ if (rcu_dereference_protected(cset->dom_cset, 1) != cset) {
+ threaded_csets++;
+ seq_printf(seq, "=>%pK", cset->dom_cset);
+ }
+ if (!list_empty(&cset->threaded_csets)) {
+ struct css_set *tcset;
+ int idx = 0;
+
+ list_for_each_entry(tcset, &cset->threaded_csets,
+ threaded_csets_node) {
+ seq_puts(seq, idx ? "," : "<=");
+ seq_printf(seq, "%pK", tcset);
+ idx++;
+ }
+ } else {
+ seq_printf(seq, " %d", refcnt);
+ if (refcnt - cset->nr_tasks > 0) {
+ int extra = refcnt - cset->nr_tasks;
+
+ seq_printf(seq, " +%d", extra);
+ /*
+ * Take out the one additional reference in
+ * init_css_set.
+ */
+ if (cset == &init_css_set)
+ extra--;
+ extra_refs += extra;
+ }
}
seq_puts(seq, "\n");
@@ -163,10 +185,12 @@ static int cgroup_css_links_read(struct seq_file *seq, void *v)
}
spin_unlock_irq(&css_set_lock);
- if (!dead_cnt && !extra_refs)
+ if (!dead_cnt && !extra_refs && !threaded_csets)
return 0;
seq_puts(seq, "\n");
+ if (threaded_csets)
+ seq_printf(seq, "threaded css_sets = %d\n", threaded_csets);
if (extra_refs)
seq_printf(seq, "extra references = %d\n", extra_refs);
if (dead_cnt)
@@ -352,6 +376,7 @@ static int __init enable_cgroup_debug(char *str)
{
debug_cgrp_subsys.dfl_cftypes = debug_files;
debug_cgrp_subsys.implicit_on_dfl = true;
+ debug_cgrp_subsys.threaded = true;
return 1;
}
__setup("cgroup_debug", enable_cgroup_debug);