linux-kernel - Re: System slow down from udev

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Date:	Thu, 30 May 2013 21:46:31 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
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 Thursday, May 30, 2013 10:42:09 AM Yinghai Lu wrote:
> 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.

Great!

> > ---
> >  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 ?

Yes, thanks for noticing that!

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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