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Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 75 |
1 files changed, 32 insertions, 43 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b3b5ce13de2b..26534c8e927a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3771,10 +3771,6 @@ no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces kernel to use 4-level paging instead. - noaliencache [MM, NUMA, SLAB] Disables the allocation of alien - caches in the slab allocator. Saves per-node memory, - but will impact performance. - noalign [KNL,ARM] noaltinstr [S390,EARLY] Disables alternative instructions @@ -5930,65 +5926,58 @@ simeth= [IA-64] simscsi= - slram= [HW,MTD] - - slab_merge [MM] - Enable merging of slabs with similar size when the - kernel is built without CONFIG_SLAB_MERGE_DEFAULT. - - slab_nomerge [MM] - Disable merging of slabs with similar size. May be - necessary if there is some reason to distinguish - 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/mm/slub.rst. - - slab_max_order= [MM, SLAB] - Determines the maximum allowed order for slabs. - A high setting may cause OOMs due to memory - fragmentation. Defaults to 1 for systems with - more than 32MB of RAM, 0 otherwise. - - slub_debug[=options[,slabs][;[options[,slabs]]...] [MM, SLUB] - Enabling slub_debug allows one to determine the + slab_debug[=options[,slabs][;[options[,slabs]]...] [MM] + Enabling slab_debug allows one to determine the culprit if slab objects become corrupted. Enabling - slub_debug can create guard zones around objects and + slab_debug can create guard zones around objects and may poison objects when not in use. Also tracks the last alloc / free. For more information see Documentation/mm/slub.rst. + (slub_debug legacy name also accepted for now) - slub_max_order= [MM, SLUB] + slab_max_order= [MM] Determines the maximum allowed order for slabs. A high setting may cause OOMs due to memory fragmentation. For more information see Documentation/mm/slub.rst. + (slub_max_order legacy name also accepted for now) + + slab_merge [MM] + Enable merging of slabs with similar size when the + kernel is built without CONFIG_SLAB_MERGE_DEFAULT. + (slub_merge legacy name also accepted for now) - slub_min_objects= [MM, SLUB] + slab_min_objects= [MM] The minimum number of objects per slab. SLUB will - increase the slab order up to slub_max_order to + increase the slab order up to slab_max_order to generate a sufficiently large slab able to contain the number of objects indicated. The higher the number of objects the smaller the overhead of tracking slabs and the less frequently locks need to be acquired. For more information see Documentation/mm/slub.rst. + (slub_min_objects legacy name also accepted for now) - slub_min_order= [MM, SLUB] + slab_min_order= [MM] Determines the minimum page order for slabs. Must be - lower than slub_max_order. - For more information see Documentation/mm/slub.rst. + lower or equal to slab_max_order. For more information see + Documentation/mm/slub.rst. + (slub_min_order legacy name also accepted for now) - slub_merge [MM, SLUB] - Same with slab_merge. + slab_nomerge [MM] + Disable merging of slabs with similar size. May be + necessary if there is some reason to distinguish + 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/mm/slub.rst. + (slub_nomerge legacy name also accepted for now) - slub_nomerge [MM, SLUB] - Same with slab_nomerge. This is supported for legacy. - See slab_nomerge for more information. + slram= [HW,MTD] smart2= [HW] Format: <io1>[,<io2>[,...,<io8>]] |