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SubjectRe: [BUG] CFS vs cpu hotplug
On Thu, Jun 19, 2008 at 11:32:29PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-19 at 20:05 +0200, Peter Zijlstra wrote:
> > On Thu, 2008-06-19 at 18:19 +0200, Heiko Carstens wrote:
>
> > > The sched_entity that belongs to the cfs_rq:
> > >
> > > >> px *(sched_entity *) 0x759300
> > > struct sched_entity {
> > > load = struct load_weight {
> > > weight = 0x800
> > > inv_weight = 0x1ffc01
> > > }
> > > run_node = struct rb_node {
> > > rb_parent_color = 0x1
> > > rb_right = (nil)
> > > rb_left = (nil)
> > > }
> > > group_node = struct list_head {
> > > next = 0x75a3b8
> > > prev = 0x75a3b8
> > > }
> > > on_rq = 0x1
> > > exec_start = 0x189685acb4aa46
> > > sum_exec_runtime = 0x188a2b84c
> > > vruntime = 0xd036bd29
> > > prev_sum_exec_runtime = 0x1672e3f62
> > > last_wakeup = 0x0
> > > avg_overlap = 0x0
> > > parent = (nil)
> > > cfs_rq = 0x75a380
> > > my_q = 0x759400
> > > }
>
> If you still have this dump, could you give the output of:
>
> px *(struct cfs_rq *) 0x759400
>
> And possibly walk down the chain getting its curr and then my_q again
> etc..

Sure, fortunately just a very short chain:

>> px *(struct cfs_rq *) 0x759400
struct cfs_rq {
load = struct load_weight {
weight = 0xc31
inv_weight = 0x0
}
nr_running = 0x1
exec_clock = 0x0
min_vruntime = 0x4f216b005
tasks_timeline = struct rb_root {
rb_node = 0x2fca4d40
}
rb_leftmost = 0x2fca4d40
tasks = struct list_head {
next = 0x2fca4d58
prev = 0x2fca4d58
}
balance_iterator = 0x2e29e700
curr = 0x2ef4f388
next = (nil)
nr_spread_over = 0x0
rq = 0x75a300
leaf_cfs_rq_list = struct list_head {
next = 0x75aaa0
prev = 0x2e1eca70
}
tg = 0x564910
}

>> px *(sched_entity *) 0x2ef4f388
struct sched_entity {
load = struct load_weight {
weight = 0x400
inv_weight = 0x400000
}
run_node = struct rb_node {
rb_parent_color = 0x2f07b399
rb_right = (nil)
rb_left = (nil)
}
group_node = struct list_head {
next = 0x2ef4f3b0
prev = 0x2ef4f3b0
}
on_rq = 0x0
exec_start = 0x189685c9a77b96
sum_exec_runtime = 0x3c51111
vruntime = 0x493becf68
prev_sum_exec_runtime = 0x3c50997
last_wakeup = 0x0
avg_overlap = 0x4b67d1
parent = 0x763300
cfs_rq = 0x763400
my_q = (nil)
}


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