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slub: extend slub debug to handle multiple slabs

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Extend the slub_debug syntax to "slub_debug=<flags>[,<slub>]*", where
<slub> may contain an asterisk at the end.  For example, the following
would poison all kmalloc slabs:

	slub_debug=P,kmalloc*

and the following would apply the default flags to all kmalloc and all
block IO slabs:

	slub_debug=,bio*,kmalloc*

Please note that a similar patch was posted by Iliyan Malchev some time
ago but was never merged:

	https://marc.info/?l=linux-mm&m=131283905330474&w=2

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Aaron Tomlin <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Iliyan Malchev <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Aaron Tomlin 2018-10-26 15:03:15 -07:00 • committed by Linus Torvalds
commit c5fd3ca06b
2 changed files with 53 additions and 9 deletions
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12
Documentation/vm/slub.rst
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@ -36,9 +36,10 @@ debugging is enabled. Format:
slub_debug=<Debug-Options>
Enable options for all slabs
slub_debug=<Debug-Options>,<slab name>
Enable options only for select slabs
slub_debug=<Debug-Options>,<slab name1>,<slab name2>,...
Enable options only for select slabs (no spaces
after a comma)
Possible debug options are::
@ -62,7 +63,12 @@ Trying to find an issue in the dentry cache? Try::
slub_debug=,dentry
to only enable debugging on the dentry cache.
to only enable debugging on the dentry cache. You may use an asterisk at the
end of the slab name, in order to cover all slabs with the same prefix. For
example, here's how you can poison the dentry cache as well as all kmalloc
slabs:
slub_debug=P,kmalloc-*,dentry
Red zoning and tracking may realign the slab. We can just apply sanity checks
to the dentry cache with::