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authorOliver Glitta <glittao@gmail.com>2021-07-07 18:07:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-08 11:48:20 -0700
commit788691464c29455346dc613a3b43c2fb9e5757a4 (patch)
tree9cc94b1811c694b18e10bfeceb6cc9a9ee0b6f21 /init
parent113616ec5b64b23a1c9b663adafadabdfbec0f51 (diff)
downloadlwn-788691464c29455346dc613a3b43c2fb9e5757a4.tar.gz
lwn-788691464c29455346dc613a3b43c2fb9e5757a4.zip
mm/slub: use stackdepot to save stack trace in objects
Many stack traces are similar so there are many similar arrays. Stackdepot saves each unique stack only once. Replace field addrs in struct track with depot_stack_handle_t handle. Use stackdepot to save stack trace. The benefits are smaller memory overhead and possibility to aggregate per-cache statistics in the future using the stackdepot handle instead of matching stacks manually. [rdunlap@infradead.org: rename save_stack_trace()] Link: https://lkml.kernel.org/r/20210513051920.29320-1-rdunlap@infradead.org [vbabka@suse.cz: fix lockdep splat] Link: https://lkml.kernel.org/r/20210516195150.26740-1-vbabka@suse.czLink: https://lkml.kernel.org/r/20210414163434.4376-1-glittao@gmail.com Signed-off-by: Oliver Glitta <glittao@gmail.com> Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: David Rientjes <rientjes@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 55f9f7738ebb..bb0d6e6262b1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1847,6 +1847,7 @@ config SLUB_DEBUG
default y
bool "Enable SLUB debugging support" if EXPERT
depends on SLUB && SYSFS
+ select STACKDEPOT if STACKTRACE_SUPPORT
help
SLUB has extensive debug support features. Disabling these can
result in significant savings in code size. This also disables