lib/stackdepot: use fixed-sized slots for stack records
Instead of storing stack records in stack depot pools one right after
another, use fixed-sized slots.
Add a new Kconfig option STACKDEPOT_MAX_FRAMES that allows to select the
size of the slot in frames. Use 64 as the default value, which is the
maximum stack trace size both KASAN and KMSAN use right now.
Also add descriptions for other stack depot Kconfig options.
This is preparatory patch for implementing the eviction of stack records
from the stack depot.
Link: https://lkml.kernel.org/r/dce7d030a99ff61022509665187fac45b0827298.1700502145.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/lib/Kconfig b/lib/Kconfig
index 3ea1c83..5ddda7c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -713,10 +713,20 @@
config STACKDEPOT
bool
select STACKTRACE
+ help
+ Stack depot: stack trace storage that avoids duplication
config STACKDEPOT_ALWAYS_INIT
bool
select STACKDEPOT
+ help
+ Always initialize stack depot during early boot
+
+config STACKDEPOT_MAX_FRAMES
+ int "Maximum number of frames in trace saved in stack depot"
+ range 1 256
+ default 64
+ depends on STACKDEPOT
config REF_TRACKER
bool
