lkml.org 
[lkml]   [2008]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[patch] fix sched_debug livelock
From
Date
(resending, didn't cc lkml)

Revert debugging commit 7ba2e74ab5a0518bc953042952dd165724bc70c9. print_cfs_rq_tasks()
can induce live-lock if a task is dequeued during list traversal.

Signed-off-by: Mike Galbraith <efault@gmx.de>

index 89fa32b..d72e8b4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1611,30 +1611,6 @@ static const struct sched_class fair_sched_class = {
};

#ifdef CONFIG_SCHED_DEBUG
-static void
-print_cfs_rq_tasks(struct seq_file *m, struct cfs_rq *cfs_rq, int depth)
-{
- struct sched_entity *se;
-
- if (!cfs_rq)
- return;
-
- list_for_each_entry_rcu(se, &cfs_rq->tasks, group_node) {
- int i;
-
- for (i = depth; i; i--)
- seq_puts(m, " ");
-
- seq_printf(m, "%lu %s %lu\n",
- se->load.weight,
- entity_is_task(se) ? "T" : "G",
- calc_delta_weight(SCHED_LOAD_SCALE, se)
- );
- if (!entity_is_task(se))
- print_cfs_rq_tasks(m, group_cfs_rq(se), depth + 1);
- }
-}
-
static void print_cfs_stats(struct seq_file *m, int cpu)
{
struct cfs_rq *cfs_rq;
@@ -1642,9 +1618,6 @@ static void print_cfs_stats(struct seq_file *m, int cpu)
rcu_read_lock();
for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
print_cfs_rq(m, cpu, cfs_rq);
-
- seq_printf(m, "\nWeight tree:\n");
- print_cfs_rq_tasks(m, &cpu_rq(cpu)->cfs, 1);
rcu_read_unlock();
}
#endif



\
 
 \ /
  Last update: 2008-04-29 14:45    [W:0.066 / U:0.712 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site