Messages in this thread | | | Date | Wed, 11 May 2011 09:56:35 -0700 | Subject | Re: [GIT PULL rcu/next] rcu commits for 2.6.40 | From | Yinghai Lu <> |
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On Tue, May 10, 2011 at 9:54 PM, Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote: > On Tue, May 10, 2011 at 01:52:52PM -0700, Yinghai Lu wrote: >> On 05/10/2011 12:32 PM, Paul E. McKenney wrote: >> > On Tue, May 10, 2011 at 11:04:57AM -0700, Yinghai Lu wrote: >> >> On 05/10/2011 01:56 AM, Paul E. McKenney wrote: >> >>> On Mon, May 09, 2011 at 02:09:21PM -0700, Yinghai Lu wrote: >> >>>> On Mon, May 9, 2011 at 12:36 AM, Ingo Molnar <mingo@elte.hu> wrote: >> >>>>> >> >>>>> * Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote: >> >>>>> >> >>>>>> Hello, Ingo, >> >>>>>> >> >>>>>> This pull request covers RCU chnages for 2.6.40. The major new features >> >>>>>> are RCU priority boosting and the addition of kfree_rcu(), the latter >> >>>>>> courtesy of Lai Jiangshan. These two features cover well over half >> >>>>>> of the commits. There are a number of smaller features and bug fixes. >> >>>>>> All have been sent to LKML in the following batches: >> >>>>>> >> >>>>>> 0. https://lkml.org/lkml/2011/2/22/660: RCU priority boosting preview >> >>>>>> 1. https://lkml.org/lkml/2011/5/1/19: RCU priority boosting, kfree_rcu() >> >>>>>> 2. https://lkml.org/lkml/2011/5/2/40: More uses of kfree_rcu() >> >>>>>> 3. https://lkml.org/lkml/2011/5/8/60: miscellaneous >> >>>>>> >> >>>>>> The kfree_rcu() uses in the pull request have Acked-by:s from the >> >>>>>> maintainers. I have some additional kfree_rcu() requests that lack >> >>>>>> Acked-by:s, and I will deal with these later. >> >>>>>> >> >>>>>> These channges are available in the -rcu git repository at: >> >>>>>> >> >>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git rcu/next >> >>>>> >> >>>>> Pulled, thanks a lot Paul! >> >>>>> >> >>>> >> >>>> it seems with this one in tip, my 8 sockets test setup will report cpu stall. >> >>>> >> >>>> after hard code to enable rcu_cpu_stall_suppress >> >>>> >> >>>> Index: linux-2.6/kernel/rcutree.c >> >>>> =================================================================== >> >>>> --- linux-2.6.orig/kernel/rcutree.c >> >>>> +++ linux-2.6/kernel/rcutree.c >> >>>> @@ -174,7 +174,7 @@ module_param(blimit, int, 0); >> >>>> module_param(qhimark, int, 0); >> >>>> module_param(qlowmark, int, 0); >> >>>> >> >>>> -int rcu_cpu_stall_suppress __read_mostly; >> >>>> +int rcu_cpu_stall_suppress __read_mostly = 1; >> >>>> module_param(rcu_cpu_stall_suppress, int, 0644); >> >>>> >> >>>> static void force_quiescent_state(struct rcu_state *rsp, int relaxed); >> >>>> >> >>>> will get system hang after pnp ACPI init. >> >>> >> >>> Could you please send the stack traces from the RCU CPU stall? Also, >> >>> you do have ce31332d3c77532d6ea97ddcb475a2b02dd358b4 applied, correct? >> >>> >> >>> Thanx, Paul >> >> >> >> Do not have time to bisect it at this point. >> > >> > Could you please send the stack traces from the RCU CPU stall? > > Thank you! OK, so CPU 0 has not been responding, despite resched IPIs. > Everyone is idle, except for CPU 124, which detected the stall, and > possibly CPU 0, which has csum_partial_copy_generic() on the stack, though > that looks like a backtrace error to me. The fact that it hangs if you > disable RCU CPU stall detection leads me to believe that something real > is being detected.
the problem is that now I can not disable RCU CPU stall detection any more.
Thanks
Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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