diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index aa1d4409fe0a..d9c171ce4190 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2315,8 +2315,11 @@ that the amount of memory usable for all allocations is not too small. - movable_node [KNL] Boot-time switch to enable the effects - of CONFIG_MOVABLE_NODE=y. See mm/Kconfig for details. + movable_node [KNL] Boot-time switch to make hotplugable memory + NUMA nodes to be movable. This means that the memory + of such nodes will be usable only for movable + allocations which rules out almost all kernel + allocations. Use with caution! MTD_Partition= [MTD] Format: <name>,<region-number>,<size>,<offset> @@ -3772,8 +3775,14 @@ slab_nomerge [MM] Disable merging of slabs with similar size. May be necessary if there is some reason to distinguish - allocs to different slabs. Debug options disable - merging on their own. + allocs to different slabs, especially in hardened + environments where the risk of heap overflows and + layout control by attackers can usually be + frustrated by disabling merging. This will reduce + most of the exposure of a heap attack to a single + cache (risks via metadata attacks are mostly + unchanged). Debug options disable merging on their + own. For more information see Documentation/vm/slub.txt. slab_max_order= [MM, SLAB] |