From: Sander Eikelenboom <linux@eikelenboom.it>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
<xen-devel@lists.xensource.com>, <linux-kernel@vger.kernel.org>
Subject: Re: [Xen-devel] Regression introduced with 14e568e78f6f80ca1e27256641ddf524c7dbdc51 (stop_machine: Use smpboot threads)
Date: Tue, 26 Feb 2013 21:33:41 +0100 [thread overview]
Message-ID: <114314748.20130226213341@eikelenboom.it> (raw)
In-Reply-To: <alpine.LFD.2.02.1302261843240.22263@ionos>
Tuesday, February 26, 2013, 6:44:33 PM, you wrote:
> On Tue, 26 Feb 2013, Sander Eikelenboom wrote:
>> Tuesday, February 26, 2013, 1:36:36 PM, you wrote:
>> > On Fri, 22 Feb 2013, Konrad Rzeszutek Wilk wrote:
>> >>
>> >> I don't know if this is b/c the Xen code is missing something or
>> >> expects something that never happend. I hadn't looked at your
>> >> patch in any detail (was going to do that on Monday).
>> >>
>> >> Either way, if I boot a HVM guest with PV extensions (aka PVHVM)
>>
>> Hmm i'm seeing this booting on baremetal as well.
>> (see http://lkml.indiana.edu/hypermail/linux/kernel/1302.3/00836.html)
> Ok. I decoded it with the help of Konrad. Does the patch below work
> for you as well?
Did a few reboots and yes it seems to work here as well !
Thx
--
Sander
> Thanks,
> tglx
> Index: linux-2.6/include/linux/smpboot.h
> ===================================================================
> --- linux-2.6.orig/include/linux/smpboot.h
> +++ linux-2.6/include/linux/smpboot.h
> @@ -24,6 +24,9 @@ struct smpboot_thread_data;
> * parked (cpu offline)
> * @unpark: Optional unpark function, called when the thread is
> * unparked (cpu online)
> + * @pre_unpark: Optional unpark function, called before the thread is
> + * unparked (cpu online). This is not guaranteed to be
> + * called on the target cpu of the thread. Careful!
> * @selfparking: Thread is not parked by the park function.
> * @thread_comm: The base name of the thread
> */
> @@ -37,6 +40,7 @@ struct smp_hotplug_thread {
> void (*cleanup)(unsigned int cpu, bool online);
> void (*park)(unsigned int cpu);
> void (*unpark)(unsigned int cpu);
> + void (*pre_unpark)(unsigned int cpu);
> bool selfparking;
> const char *thread_comm;
> };
> Index: linux-2.6/kernel/smpboot.c
> ===================================================================
> --- linux-2.6.orig/kernel/smpboot.c
> +++ linux-2.6/kernel/smpboot.c
> @@ -209,6 +209,8 @@ static void smpboot_unpark_thread(struct
> {
> struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu);
>
+ if (ht->>pre_unpark)
+ ht->>pre_unpark(cpu);
> kthread_unpark(tsk);
> }
>
> Index: linux-2.6/kernel/stop_machine.c
> ===================================================================
> --- linux-2.6.orig/kernel/stop_machine.c
> +++ linux-2.6/kernel/stop_machine.c
> @@ -336,7 +336,7 @@ static struct smp_hotplug_thread cpu_sto
> .create = cpu_stop_create,
> .setup = cpu_stop_unpark,
> .park = cpu_stop_park,
> - .unpark = cpu_stop_unpark,
> + .pre_unpark = cpu_stop_unpark,
> .selfparking = true,
> };
>
next prev parent reply other threads:[~2013-02-26 20:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-23 1:18 Regression introduced with 14e568e78f6f80ca1e27256641ddf524c7dbdc51 (stop_machine: Use smpboot threads) Konrad Rzeszutek Wilk
2013-02-26 12:36 ` Thomas Gleixner
2013-02-26 13:07 ` [Xen-devel] " Sander Eikelenboom
2013-02-26 17:44 ` Thomas Gleixner
2013-02-26 20:33 ` Sander Eikelenboom [this message]
2013-02-26 21:38 ` [tip:core/urgent] stop_machine: Mark per cpu stopper enabled early tip-bot for Thomas Gleixner
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