linux-kernel - Re: System slow down from udev

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Message-ID: <CAE9FiQU=kC7J2Ocqy-Bq8rN-pO_2gDOrngwev_be70j=LLSpUg@mail.gmail.com>
Date:	Thu, 30 May 2013 10:42:09 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>
Subject: Re: System slow down from udev

On Thu, May 30, 2013 at 9:36 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Thursday, May 30, 2013 04:45:35 PM Rafael J. Wysocki wrote:
>> On Thursday, May 30, 2013 04:34:51 PM Rafael J. Wysocki wrote:
> [...]
>> >
>> > I'll try to dig deeper locally in the meantime.
>>
>> Actually, I think I know what the problem is, but I need some more time to
>> debug it.  Fortunately, I'm able to see some symptoms. :-)
>
> OK, one fix is appended, but there still is one more bug I need to investigate.
>
> Please check if this one helps, though.

yes, that fix the problem.


>
> Thanks,
> Rafael
>
>
> ---
>  drivers/acpi/acpi_processor.c   |    5 +++++
>  drivers/acpi/processor_driver.c |    3 ---
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> Index: linux-pm/drivers/acpi/processor_driver.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/processor_driver.c
> +++ linux-pm/drivers/acpi/processor_driver.c
> @@ -78,9 +78,6 @@ static struct device_driver acpi_process
>         .remove = acpi_processor_stop,
>  };
>
> -DEFINE_PER_CPU(struct acpi_processor *, processors);
> -EXPORT_PER_CPU_SYMBOL(processors);
> -
>  static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
>  {
>         struct acpi_device *device = data;
> Index: linux-pm/drivers/acpi/acpi_processor.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/acpi_processor.c
> +++ linux-pm/drivers/acpi/acpi_processor.c
> @@ -29,6 +29,9 @@
>
>  ACPI_MODULE_NAME("processor");
>
> +DEFINE_PER_CPU(struct acpi_processor *, processors);
> +EXPORT_PER_CPU_SYMBOL(processors);
> +
>  /* --------------------------------------------------------------------------
>                                  Errata Handling
>     -------------------------------------------------------------------------- */
> @@ -387,6 +390,7 @@ static int __cpuinit acpi_processor_add(
>          * checks.
>          */
>         per_cpu(processor_device_array, pr->id) = device;
> +       per_cpu(processors, pr->id) = pr;
>
>         dev = get_cpu_device(pr->id);
>         result = acpi_bind_one(dev, pr->handle);
> @@ -406,6 +410,7 @@ static int __cpuinit acpi_processor_add(
>   err:
>         free_cpumask_var(pr->throttling.shared_cpu_map);
>         device->driver_data = NULL;
> +       per_cpu(processors, pr->id) = NULL;
>   err_free_pr:
>         kfree(pr);
>         return result;
>

do you need to remove
    per_cpu(processors, pr->id) = NULL;
from processor_driver.c::acpi_processor_stop ?
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