linux-kernel - Re: [Bug #11989] Suspend failure on NForce4-based boards due to chanes in stop

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Date:	Tue, 11 Nov 2008 17:14:01 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Oleg Nesterov <oleg@...hat.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [Bug #11989] Suspend failure on NForce4-based boards due to
	chanes in stop_machine

> > Could you please apply the following debug patch (due to Jiangshan and
> > myself)?  Then you should be able to build with CONFIG_RCU_TRACE,
> > then mount debugfs after boot, for example, on /debug.  This will
> > create a /debug/rcu directory with three files, "rcucb", "rcu_data",
> > and "rcu_bh_data".  Since you are still able to log in, could you
> > please send the contents of these three files?
> > 
> > 							Thanx, Paul
> 
> This time with the patch actually attached...  Thanks to Peter Z.
> for alerting me to my omission.

Well, your patch doesn't apply on git head. However I used preemptible
RCU instead and had tracing enabled.

This is the output of the three files after it stalled (and continued,
because I caused an interrupt by sending a network packet) twice:

[root@...45001 rcu]# cat rcuctrs 
CPU last cur F M
  1    0   0 1 1
  3    0   0 1 1
  4    0   0 0 0
  5    0   0 0 1
  6    0   0 0 0
ggp = 1640, state = waitack

[root@...45001 rcu]# cat rcugp 
oldggp=1652  newggp=1655

[root@...45001 rcu]# cat rcustats 
na=33948 nl=3 wa=33945 wl=0 da=33945 dl=0 dr=33945 di=0
1=0 e1=0 i1=1674 ie1=4 g1=1670 a1=1920 ae1=251 a2=1669
z1=1669 ze1=0 z2=1669 m1=4411 me1=2742 m2=1669

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