Subject: Re: [BUG] CFS vs cpu hotplug
From: Peter Zijlstra <peterz@infradead.org>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Avi Kivity <avi@qumranet.com>,
       linux-kernel@vger.kernel.org,
       Dmitry Adamushko <dmitry.adamushko@gmail.com>
In-Reply-To: <20080619211447.GA6180@osiris.ibm.com>
References: <20080619161949.GA11062@osiris.ibm.com>
	 <1213898711.3223.107.camel@lappy.programming.kicks-ass.net>
	 <1213899242.3223.110.camel@lappy.programming.kicks-ass.net>
	 <20080619211447.GA6180@osiris.ibm.com>
Content-Type: text/plain
Date: Thu, 19 Jun 2008 23:26:38 +0200
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On Thu, 2008-06-19 at 23:14 +0200, Heiko Carstens wrote:
> On Thu, Jun 19, 2008 at 08:14:02PM +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
> > > > }
> > 
> > Ooh, this thing is with CONFIG_GROUP_SCHED... does it still happen when
> > you disable that?
> 
> Indeed, when CONFIG_GROUP_SCHED is disabled I cannot reproduce it anymore.

Ok, that gives us some idea where to look, thanks for this data point.

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