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lib/stackdepot: use fixed-sized slots for stack records

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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>
This commit is contained in:
Andrey Konovalov
2023-11-20 18:47:04 +01:00
committed by Andrew Morton
parent 83130ab2d8
commit fc60e0caa9
2 changed files with 19 additions and 4 deletions
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10
lib/Kconfig
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@@ -713,10 +713,20 @@ config ARCH_STACKWALK
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