diff options
Diffstat (limited to 'Documentation/memory-hotplug.txt')
| -rw-r--r-- | Documentation/memory-hotplug.txt | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/Documentation/memory-hotplug.txt b/Documentation/memory-hotplug.txt index 8e5eacbdcfa3..58340d50f8a6 100644 --- a/Documentation/memory-hotplug.txt +++ b/Documentation/memory-hotplug.txt @@ -163,7 +163,7 @@ a recent addition and not present on older kernels. at read: contains online/offline state of memory. at write: user can specify "online_kernel", "online_movable", "online", "offline" command - which will be performed on al sections in the block. + which will be performed on all sections in the block. 'phys_device' : read-only: designed to show the name of physical memory device. This is not well implemented now. 'removable' : read-only: contains an integer value indicating @@ -210,13 +210,15 @@ If memory device is found, memory hotplug code will be called. 4.2 Notify memory hot-add event by hand ------------ -In some environments, especially virtualized environment, firmware will not -notify memory hotplug event to the kernel. For such environment, "probe" -interface is supported. This interface depends on CONFIG_ARCH_MEMORY_PROBE. - -Now, CONFIG_ARCH_MEMORY_PROBE is supported only by powerpc but it does not -contain highly architecture codes. Please add config if you need "probe" -interface. +On powerpc, the firmware does not notify a memory hotplug event to the kernel. +Therefore, "probe" interface is supported to notify the event to the kernel. +This interface depends on CONFIG_ARCH_MEMORY_PROBE. + +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 you need the "probe" interface for testing purposes +on x86. Probe interface is located at /sys/devices/system/memory/probe |