From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/Documentation/vm/slub.rst | 55 +++++++++++++++++++++++++++++++++++++++++--------------
1 files changed, 41 insertions(+), 14 deletions(-)
diff --git a/kernel/Documentation/vm/slub.rst b/kernel/Documentation/vm/slub.rst
index 3602959..d302855 100644
--- a/kernel/Documentation/vm/slub.rst
+++ b/kernel/Documentation/vm/slub.rst
@@ -36,9 +36,15 @@
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)
+
+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::
@@ -48,7 +54,7 @@
P Poisoning (object and padding)
U User tracking (free and alloc)
T Trace (please only use on single slabs)
- A Toggle failslab filter mark for the cache
+ A Enable failslab filter mark for the cache
O Switch debugging off for caches that would have
caused higher minimum slab orders
- Switch all debugging off (useful if the kernel is
@@ -62,7 +68,12 @@
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::
@@ -77,17 +88,33 @@
slub_debug=O
-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::
+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
+
+The state of each debug option for a slab can be found in the respective files
+under::
/sys/kernel/slab/<slab name>/
-Look at the writable files. Writing 1 to them will enable the
-corresponding debug option. All options can be set on a slab that does
-not contain objects. If the slab already contains objects then sanity checks
-and tracing may only be enabled. The other options may cause the realignment
-of objects.
+If the file contains 1, the option is enabled, 0 means disabled. The debug
+options from the ``slub_debug`` parameter translate to the following files::
+
+ F sanity_checks
+ Z red_zone
+ P poison
+ U store_user
+ T trace
+ A failslab
Careful with tracing: It may spew out lots of information and never stop if
used on the wrong slab.
@@ -135,7 +162,7 @@
(list_lock) where contention may occur.
``slub_min_order``
- specifies a minim order of slabs. A similar effect like
+ specifies a minimum order of slabs. A similar effect like
``slub_min_objects``.
``slub_max_order``
@@ -351,7 +378,7 @@
can go unnoticed. To deal with that, ``slabinfo-gnuplot.sh`` has two
options to 'zoom-in'/'zoom-out':
- a) ``-s %d,%d`` -- overwrites the default image width and heigh
+ a) ``-s %d,%d`` -- overwrites the default image width and height
b) ``-r %d,%d`` -- specifies a range of samples to use (for example,
in ``slabinfo -X >> FOO_STATS; sleep 1;`` case, using a ``-r
40,60`` range will plot only samples collected between 40th and
--
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