修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/Documentation/vm/slub.rst
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@@ -36,9 +36,15 @@
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 slub_debug=<Debug-Options>
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 	Enable options for all slabs
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-slub_debug=<Debug-Options>,<slab name>
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-	Enable options only for select slabs
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+slub_debug=<Debug-Options>,<slab name1>,<slab name2>,...
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+	Enable options only for select slabs (no spaces
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+	after a comma)
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+
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+Multiple blocks of options for all slabs or selected slabs can be given, with
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+blocks of options delimited by ';'. The last of "all slabs" blocks is applied
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+to all slabs except those that match one of the "select slabs" block. Options
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+of the first "select slabs" blocks that matches the slab's name are applied.
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 Possible debug options are::
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@@ -48,7 +54,7 @@
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 	P		Poisoning (object and padding)
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 	U		User tracking (free and alloc)
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 	T		Trace (please only use on single slabs)
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-	A		Toggle failslab filter mark for the cache
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+	A		Enable failslab filter mark for the cache
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 	O		Switch debugging off for caches that would have
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 			caused higher minimum slab orders
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 	-		Switch all debugging off (useful if the kernel is
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@@ -62,7 +68,12 @@
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 	slub_debug=,dentry
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-to only enable debugging on the dentry cache.
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+to only enable debugging on the dentry cache.  You may use an asterisk at the
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+end of the slab name, in order to cover all slabs with the same prefix.  For
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+example, here's how you can poison the dentry cache as well as all kmalloc
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+slabs::
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+
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+	slub_debug=P,kmalloc-*,dentry
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 Red zoning and tracking may realign the slab.  We can just apply sanity checks
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 to the dentry cache with::
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 	slub_debug=O
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-In case you forgot to enable debugging on the kernel command line: It is
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-possible to enable debugging manually when the kernel is up. Look at the
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-contents of::
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+You can apply different options to different list of slab names, using blocks
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+of options. This will enable red zoning for dentry and user tracking for
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+kmalloc. All other slabs will not get any debugging enabled::
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+
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+	slub_debug=Z,dentry;U,kmalloc-*
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+
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+You can also enable options (e.g. sanity checks and poisoning) for all caches
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+except some that are deemed too performance critical and don't need to be
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+debugged by specifying global debug options followed by a list of slab names
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+with "-" as options::
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+
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+	slub_debug=FZ;-,zs_handle,zspage
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+
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+The state of each debug option for a slab can be found in the respective files
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+under::
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 	/sys/kernel/slab/<slab name>/
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-Look at the writable files. Writing 1 to them will enable the
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-corresponding debug option. All options can be set on a slab that does
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-not contain objects. If the slab already contains objects then sanity checks
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-and tracing may only be enabled. The other options may cause the realignment
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-of objects.
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+If the file contains 1, the option is enabled, 0 means disabled. The debug
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+options from the ``slub_debug`` parameter translate to the following files::
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+
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+	F	sanity_checks
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+	Z	red_zone
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+	P	poison
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+	U	store_user
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+	T	trace
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+	A	failslab
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 Careful with tracing: It may spew out lots of information and never stop if
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 used on the wrong slab.
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@@ -135,7 +162,7 @@
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 	(list_lock) where contention may occur.
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 ``slub_min_order``
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-	specifies a minim order of slabs. A similar effect like
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+	specifies a minimum order of slabs. A similar effect like
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 	``slub_min_objects``.
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 ``slub_max_order``
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    can go unnoticed. To deal with that, ``slabinfo-gnuplot.sh`` has two
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    options to 'zoom-in'/'zoom-out':
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-   a) ``-s %d,%d`` -- overwrites the default image width and heigh
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+   a) ``-s %d,%d`` -- overwrites the default image width and height
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    b) ``-r %d,%d`` -- specifies a range of samples to use (for example,
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       in ``slabinfo -X >> FOO_STATS; sleep 1;`` case, using a ``-r
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       40,60`` range will plot only samples collected between 40th and