Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-19 Thread Toshi Kani
On Wed, 2013-07-17 at 20:24 -0400, KOSAKI Motohiro wrote: > On Wed, Jul 17, 2013 at 7:51 PM, Toshi Kani wrote: > > On Wed, 2013-07-17 at 19:33 -0400, KOSAKI Motohiro wrote: > >> On Wed, Jul 17, 2013 at 7:29 PM, Toshi Kani wrote: > >> > On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: > >

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Toshi Kani
On Thu, 2013-07-18 at 13:29 -0700, Dave Hansen wrote: > On 07/18/2013 01:10 PM, Toshi Kani wrote: > > On Thu, 2013-07-18 at 11:34 -0700, Dave Hansen wrote: > > I do not think so. Using echo command to write a value to /dev/sda is > > not how it is instructed to use in the document. I am not sayin

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Dave Hansen
On 07/18/2013 01:10 PM, Toshi Kani wrote: > On Thu, 2013-07-18 at 11:34 -0700, Dave Hansen wrote: > I do not think so. Using echo command to write a value to /dev/sda is > not how it is instructed to use in the document. I am not saying that > we need to protect from a privileged user doing somet

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Toshi Kani
On Thu, 2013-07-18 at 11:34 -0700, Dave Hansen wrote: > On 07/18/2013 09:26 AM, Toshi Kani wrote: > > On Thu, 2013-07-18 at 08:27 -0700, Dave Hansen wrote: > >> I'd really prefer you don't do this. Do you really have random > >> processes on your system poking at random sysfs files and then > >> c

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Dave Hansen
On 07/18/2013 09:26 AM, Toshi Kani wrote: > On Thu, 2013-07-18 at 08:27 -0700, Dave Hansen wrote: >> I'd really prefer you don't do this. Do you really have random >> processes on your system poking at random sysfs files and then >> complaining when things break? > > I am afraid that the "probe"

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Toshi Kani
On Thu, 2013-07-18 at 08:27 -0700, Dave Hansen wrote: > On 07/17/2013 02:45 PM, Toshi Kani wrote: > > +CONFIG_ARCH_MEMORY_PROBE is supported on powerpc only. On x86, this config > > +option is disabled by default since ACPI notifies a memory hotplug event to > > +the kernel, which performs its hotp

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Toshi Kani
On Thu, 2013-07-18 at 10:48 +0900, Yasuaki Ishimatsu wrote: > (2013/07/18 8:51), Toshi Kani wrote: > > On Wed, 2013-07-17 at 19:33 -0400, KOSAKI Motohiro wrote: > >> On Wed, Jul 17, 2013 at 7:29 PM, Toshi Kani wrote: > >>> On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: > On Wed, Ju

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-18 Thread Dave Hansen
On 07/17/2013 02:45 PM, Toshi Kani wrote: > +CONFIG_ARCH_MEMORY_PROBE is supported on powerpc only. On x86, this config > +option is disabled by default since ACPI notifies a memory hotplug event to > +the kernel, which performs its hotplug operation as the result. Please > +enable this option if y

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread Toshi Kani
On Wed, 2013-07-17 at 20:24 -0400, KOSAKI Motohiro wrote: > On Wed, Jul 17, 2013 at 7:51 PM, Toshi Kani wrote: > > On Wed, 2013-07-17 at 19:33 -0400, KOSAKI Motohiro wrote: > >> On Wed, Jul 17, 2013 at 7:29 PM, Toshi Kani wrote: > >> > On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: > >

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread KOSAKI Motohiro
On Wed, Jul 17, 2013 at 7:51 PM, Toshi Kani wrote: > On Wed, 2013-07-17 at 19:33 -0400, KOSAKI Motohiro wrote: >> On Wed, Jul 17, 2013 at 7:29 PM, Toshi Kani wrote: >> > On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: >> >> On Wed, Jul 17, 2013 at 5:45 PM, Toshi Kani wrote: >> >> > CON

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread Toshi Kani
On Wed, 2013-07-17 at 19:33 -0400, KOSAKI Motohiro wrote: > On Wed, Jul 17, 2013 at 7:29 PM, Toshi Kani wrote: > > On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: > >> On Wed, Jul 17, 2013 at 5:45 PM, Toshi Kani wrote: > >> > CONFIG_ARCH_MEMORY_PROBE enables /sys/devices/system/memory/p

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread KOSAKI Motohiro
On Wed, Jul 17, 2013 at 7:29 PM, Toshi Kani wrote: > On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: >> On Wed, Jul 17, 2013 at 5:45 PM, Toshi Kani wrote: >> > CONFIG_ARCH_MEMORY_PROBE enables /sys/devices/system/memory/probe >> > interface, which allows a given memory address to be hot

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread Toshi Kani
On Wed, 2013-07-17 at 19:22 -0400, KOSAKI Motohiro wrote: > On Wed, Jul 17, 2013 at 5:45 PM, Toshi Kani wrote: > > CONFIG_ARCH_MEMORY_PROBE enables /sys/devices/system/memory/probe > > interface, which allows a given memory address to be hot-added as > > follows. (See Documentation/memory-hotplug.

Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread KOSAKI Motohiro
On Wed, Jul 17, 2013 at 5:45 PM, Toshi Kani wrote: > CONFIG_ARCH_MEMORY_PROBE enables /sys/devices/system/memory/probe > interface, which allows a given memory address to be hot-added as > follows. (See Documentation/memory-hotplug.txt for more detail.) > > # echo start_address_of_new_memory > /sy

[PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

2013-07-17 Thread Toshi Kani
CONFIG_ARCH_MEMORY_PROBE enables /sys/devices/system/memory/probe interface, which allows a given memory address to be hot-added as follows. (See Documentation/memory-hotplug.txt for more detail.) # echo start_address_of_new_memory > /sys/devices/system/memory/probe This probe interface is requir