diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 38 | ||||
| -rw-r--r-- | Documentation/vm/slub.txt | 2 |
2 files changed, 23 insertions, 17 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 4344f69ae24a..8916410307f1 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1580,35 +1580,39 @@ and is between 256 and 4096 characters. It is defined in the file slram= [HW,MTD] - slub_debug [MM, SLUB] - Enabling slub_debug allows one to determine the culprit - if slab objects become corrupted. Enabling slub_debug - creates guard zones around objects and poisons objects - when not in use. Also tracks the last alloc / free. - For more information see Documentation/vm/slub.txt. + slub_debug[=options[,slabs]] [MM, SLUB] + Enabling slub_debug allows one to determine the + culprit if slab objects become corrupted. Enabling + slub_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/vm/slub.txt. slub_max_order= [MM, SLUB] - Determines the maximum allowed order for slabs. Setting - this too high may cause fragmentation. - For more information see Documentation/vm/slub.txt. + Determines the maximum allowed order for slabs. + A high setting may cause OOMs due to memory + fragmentation. For more information see + Documentation/vm/slub.txt. slub_min_objects= [MM, SLUB] - The minimum objects per slab. SLUB will increase the - slab order up to slub_max_order to generate a - sufficiently big slab to satisfy the number of objects. - The higher the number of objects the smaller the overhead - of tracking slabs. + The minimum number of objects per slab. SLUB will + increase the slab order up to slub_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/vm/slub.txt. slub_min_order= [MM, SLUB] Determines the mininum page order for slabs. Must be - lower than slub_max_order + lower than slub_max_order. For more information see Documentation/vm/slub.txt. slub_nomerge [MM, SLUB] - Disable merging of slabs of similar size. May be + Disable merging of slabs with similar size. May be necessary if there is some reason to distinguish - allocs to different slabs. + allocs to different slabs. Debug options disable + merging on their own. For more information see Documentation/vm/slub.txt. smart2= [HW] diff --git a/Documentation/vm/slub.txt b/Documentation/vm/slub.txt index 1523320abd87..df812b03b65d 100644 --- a/Documentation/vm/slub.txt +++ b/Documentation/vm/slub.txt @@ -41,6 +41,8 @@ Possible debug options are P Poisoning (object and padding) U User tracking (free and alloc) T Trace (please only use on single slabs) + - Switch all debugging off (useful if the kernel is + configured with CONFIG_SLUB_DEBUG_ON) F.e. in order to boot just with sanity checks and red zoning one would specify: |