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authorQian Cai <cai@lca.pw>2019-05-16 22:57:41 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-17 01:51:55 +0300
commit7878c231dae05bae9dcf2ad4d309f02e51625033 (patch)
treec5719939c6bccf3a52a92795539cb9dfdf0bba35 /lib
parent01be377c62210a8d8fef35be906f9349591bb7cd (diff)
downloadlinux-7878c231dae05bae9dcf2ad4d309f02e51625033.tar.xz
slab: remove /proc/slab_allocators
It turned out that DEBUG_SLAB_LEAK is still broken even after recent recue efforts that when there is a large number of objects like kmemleak_object which is normal on a debug kernel, # grep kmemleak /proc/slabinfo kmemleak_object 2243606 3436210 ... reading /proc/slab_allocators could easily loop forever while processing the kmemleak_object cache and any additional freeing or allocating objects will trigger a reprocessing. To make a situation worse, soft-lockups could easily happen in this sitatuion which will call printk() to allocate more kmemleak objects to guarantee an infinite loop. Also, since it seems no one had noticed when it was totally broken more than 2-year ago - see the commit fcf88917dd43 ("slab: fix a crash by reading /proc/slab_allocators"), probably nobody cares about it anymore due to the decline of the SLAB. Just remove it entirely. Suggested-by: Vlastimil Babka <vbabka@suse.cz> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Qian Cai <cai@lca.pw> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug4
1 files changed, 0 insertions, 4 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index fdfa173651eb..eae43952902e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -542,10 +542,6 @@ config DEBUG_SLAB
allocation as well as poisoning memory on free to catch use of freed
memory. This can make kmalloc/kfree-intensive workloads much slower.
-config DEBUG_SLAB_LEAK
- bool "Memory leak debugging"
- depends on DEBUG_SLAB
-
config SLUB_DEBUG_ON
bool "SLUB debugging on by default"
depends on SLUB && SLUB_DEBUG