diff options
Diffstat (limited to 'Documentation/memory-hotplug.txt')
| -rw-r--r-- | Documentation/memory-hotplug.txt | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/memory-hotplug.txt b/Documentation/memory-hotplug.txt index 670f3ded0802..5c628e19d6cd 100644 --- a/Documentation/memory-hotplug.txt +++ b/Documentation/memory-hotplug.txt @@ -282,20 +282,26 @@ offlined it is possible to change the individual block's state by writing to the % echo online > /sys/devices/system/memory/memoryXXX/state This onlining will not change the ZONE type of the target memory block, -If the memory block is in ZONE_NORMAL, you can change it to ZONE_MOVABLE: +If the memory block doesn't belong to any zone an appropriate kernel zone +(usually ZONE_NORMAL) will be used unless movable_node kernel command line +option is specified when ZONE_MOVABLE will be used. + +You can explicitly request to associate it with ZONE_MOVABLE by % echo online_movable > /sys/devices/system/memory/memoryXXX/state (NOTE: current limit: this memory block must be adjacent to ZONE_MOVABLE) -And if the memory block is in ZONE_MOVABLE, you can change it to ZONE_NORMAL: +Or you can explicitly request a kernel zone (usually ZONE_NORMAL) by: % echo online_kernel > /sys/devices/system/memory/memoryXXX/state (NOTE: current limit: this memory block must be adjacent to ZONE_NORMAL) +An explicit zone onlining can fail (e.g. when the range is already within +and existing and incompatible zone already). + After this, memory block XXX's state will be 'online' and the amount of available memory will be increased. -Currently, newly added memory is added as ZONE_NORMAL (for powerpc, ZONE_DMA). This may be changed in future. |