diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | Documentation/vm/slub.rst | 18 |
2 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index ef66b3c45ba2..c95552269689 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4689,7 +4689,7 @@ fragmentation. Defaults to 1 for systems with more than 32MB of RAM, 0 otherwise. - slub_debug[=options[,slabs]] [MM, SLUB] + slub_debug[=options[,slabs][;[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 diff --git a/Documentation/vm/slub.rst b/Documentation/vm/slub.rst index 4eee598555c9..cfccb258cf42 100644 --- a/Documentation/vm/slub.rst +++ b/Documentation/vm/slub.rst @@ -41,6 +41,11 @@ slub_debug=<Debug-Options>,<slab name1>,<slab name2>,... Enable options only for select slabs (no spaces after a comma) +Multiple blocks of options for all slabs or selected slabs can be given, with +blocks of options delimited by ';'. The last of "all slabs" blocks is applied +to all slabs except those that match one of the "select slabs" block. Options +of the first "select slabs" blocks that matches the slab's name are applied. + Possible debug options are:: F Sanity checks on (enables SLAB_DEBUG_CONSISTENCY_CHECKS @@ -83,6 +88,19 @@ switch off debugging for such caches by default, use:: slub_debug=O +You can apply different options to different list of slab names, using blocks +of options. This will enable red zoning for dentry and user tracking for +kmalloc. All other slabs will not get any debugging enabled:: + + slub_debug=Z,dentry;U,kmalloc-* + +You can also enable options (e.g. sanity checks and poisoning) for all caches +except some that are deemed too performance critical and don't need to be +debugged by specifying global debug options followed by a list of slab names +with "-" as options:: + + slub_debug=FZ;-,zs_handle,zspage + In case you forgot to enable debugging on the kernel command line: It is possible to enable debugging manually when the kernel is up. Look at the contents of:: |