On Fri, 4 Mar 2011 00:03:55 -0800
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > [ 5066.149853] Call Trace:
> > [ 5066.149853] [<ffffffff8158e4d5>] schedule_timeout+0x215/0x2f0
> > [ 5066.149853] [<ffffffff8104e4fd>] ? task_rq_lock+0x5d/0xa0
> > [ 5066.149853] [<ffffffff81059c93>] ? try_to_wake_up+0xc3/0x410
> > [ 5066.149853] [<ffffffff8158e0cb>] wait_for_common+0xdb/0x180
> > [ 5066.149853] [<ffffffff81059fe0>] ? default_wake_function+0x0/0x20
> > [ 5066.244366] [<ffffffff8158e24d>] wait_for_completion+0x1d/0x20
> > [ 5066.244366] [<ffffffff810d44f5>] synchronize_sched+0x55/0x60
> > [ 5066.244366] [<ffffffff81080b00>] ? wakeme_after_rcu+0x0/0x20
> > [ 5066.244366] [<ffffffff811526a3>] mem_cgroup_start_move+0x93/0xa0
> > [ 5066.244366] [<ffffffff8115739b>] mem_cgroup_force_empty+0xdb/0x640
> > [ 5066.244366] [<ffffffff81157914>] mem_cgroup_pre_destroy+0x14/0x20
> > [ 5066.244366] [<ffffffff810ae681>] cgroup_rmdir+0xc1/0x560
> > [ 5066.244366] [<ffffffff81083d70>] ? autoremove_wake_function+0x0/0x40
> > [ 5066.244366] [<ffffffff81167cc4>] vfs_rmdir+0xb4/0x110
> > [ 5066.244366] [<ffffffff81169d13>] do_rmdir+0x133/0x140
> > [ 5066.244366] [<ffffffff810d3c85>] ? call_rcu_sched+0x15/0x20
> > [ 5066.244366] [<ffffffff810bf6ff>] ? audit_syscall_entry+0x1df/0x280
> > [ 5066.244366] [<ffffffff81169d76>] sys_rmdir+0x16/0x20
> > [ 5066.244366] [<ffffffff8100c042>] system_call_fastpath+0x16/0x1b
>
This seems....
==
static void mem_cgroup_start_move(struct mem_cgroup *mem)
{
.....
put_online_cpus();
synchronize_rcu(); <---------(*)
}
==
Waiting on above synchronize_rcu().
Hmm...
-Kame
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