From: Vlastimil Babka <vbabka@suse.cz>
To: Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Pekka Enberg <penberg@kernel.org>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
patches@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH 02/12] mm, slub: add CONFIG_SLUB_TINY
Date: Mon, 21 Nov 2022 18:11:52 +0100 [thread overview]
Message-ID: <20221121171202.22080-3-vbabka@suse.cz> (raw)
In-Reply-To: <20221121171202.22080-1-vbabka@suse.cz>
For tiny systems that have used SLOB until now, SLUB might be
impractical due to its higher memory usage. To help with that, introduce
an option CONFIG_SLUB_TINY that modifies SLUB to use less memory.
This is done by sacrificing scalability, security and debugging
features, therefore not recommended for any system with more than 16MB
RAM.
This commit introduces the option and uses it to set other related
options in a way that reduces memory usage.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
mm/Kconfig | 21 +++++++++++++++++----
mm/Kconfig.debug | 2 +-
2 files changed, 18 insertions(+), 5 deletions(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index 57e1d8c5b505..5941cb34e30d 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -230,6 +230,19 @@ config SLOB
endchoice
+config SLUB_TINY
+ bool "Configure SLUB for minimal memory footprint"
+ depends on SLUB && EXPERT
+ select SLAB_MERGE_DEFAULT
+ help
+ Configures the SLUB allocator in a way to achieve minimal memory
+ footprint, sacrificing scalability, debugging and other features.
+ This is intended only for the smallest system that had used the
+ SLOB allocator and is not recommended for systems with more than
+ 16MB RAM.
+
+ If unsure, say N.
+
config SLAB_MERGE_DEFAULT
bool "Allow slab caches to be merged"
default y
@@ -247,7 +260,7 @@ config SLAB_MERGE_DEFAULT
config SLAB_FREELIST_RANDOM
bool "Randomize slab freelist"
- depends on SLAB || SLUB
+ depends on SLAB || SLUB && !SLUB_TINY
help
Randomizes the freelist order used on creating new pages. This
security feature reduces the predictability of the kernel slab
@@ -255,7 +268,7 @@ config SLAB_FREELIST_RANDOM
config SLAB_FREELIST_HARDENED
bool "Harden slab freelist metadata"
- depends on SLAB || SLUB
+ depends on SLAB || SLUB && !SLUB_TINY
help
Many kernel heap attacks try to target slab cache metadata and
other infrastructure. This options makes minor performance
@@ -267,7 +280,7 @@ config SLAB_FREELIST_HARDENED
config SLUB_STATS
default n
bool "Enable SLUB performance statistics"
- depends on SLUB && SYSFS
+ depends on SLUB && SYSFS && !SLUB_TINY
help
SLUB statistics are useful to debug SLUBs allocation behavior in
order find ways to optimize the allocator. This should never be
@@ -279,7 +292,7 @@ config SLUB_STATS
config SLUB_CPU_PARTIAL
default y
- depends on SLUB && SMP
+ depends on SLUB && SMP && !SLUB_TINY
bool "SLUB per cpu partial cache"
help
Per cpu partial caches accelerate objects allocation and freeing
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index ce8dded36de9..fca699ad1fb0 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -56,7 +56,7 @@ config DEBUG_SLAB
config SLUB_DEBUG
default y
bool "Enable SLUB debugging support" if EXPERT
- depends on SLUB && SYSFS
+ depends on SLUB && SYSFS && !SLUB_TINY
select STACKDEPOT if STACKTRACE_SUPPORT
help
SLUB has extensive debug support features. Disabling these can
--
2.38.1
next prev parent reply other threads:[~2022-11-21 17:12 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-21 17:11 [PATCH 00/12] Introduce CONFIG_SLUB_TINY and deprecate SLOB Vlastimil Babka
2022-11-21 17:11 ` Vlastimil Babka
2022-11-21 17:11 ` Vlastimil Babka
2022-11-21 17:11 ` Vlastimil Babka
2022-11-21 17:11 ` [PATCH 01/12] mm, slab: ignore hardened usercopy parameters when disabled Vlastimil Babka
2022-11-21 21:35 ` Kees Cook
2022-11-23 14:23 ` Vlastimil Babka
2022-11-24 11:16 ` Hyeonggon Yoo
2022-11-24 11:26 ` Vlastimil Babka
2022-11-24 12:33 ` Hyeonggon Yoo
2022-11-21 17:11 ` Vlastimil Babka [this message]
2022-11-24 1:08 ` [PATCH 02/12] mm, slub: add CONFIG_SLUB_TINY Roman Gushchin
2022-11-24 11:33 ` Hyeonggon Yoo
2022-11-25 7:55 ` Vlastimil Babka
2022-11-21 17:11 ` [PATCH 03/12] mm, slub: disable SYSFS support with CONFIG_SLUB_TINY Vlastimil Babka
2022-11-24 1:12 ` Roman Gushchin
2022-11-24 9:00 ` Vlastimil Babka
2022-11-21 17:11 ` [PATCH 04/12] mm, slub: retain no free slabs on partial list " Vlastimil Babka
2022-11-24 1:12 ` Roman Gushchin
2022-11-24 11:38 ` Hyeonggon Yoo
2022-11-21 17:11 ` [PATCH 05/12] mm, slub: lower the default slub_max_order " Vlastimil Babka
2022-11-24 1:16 ` Roman Gushchin
2022-11-24 11:40 ` Hyeonggon Yoo
2022-11-21 17:11 ` [PATCH 06/12] mm, slub: don't create kmalloc-rcl caches " Vlastimil Babka
2022-11-23 13:53 ` Vlastimil Babka
2022-11-24 12:06 ` Hyeonggon Yoo
2022-11-24 12:12 ` Vlastimil Babka
2022-11-24 12:55 ` Hyeonggon Yoo
2022-11-24 13:23 ` Hyeonggon Yoo
2022-11-24 14:25 ` Hyeonggon Yoo
2022-11-21 17:11 ` [PATCH 07/12] mm, slab: ignore SLAB_RECLAIM_ACCOUNT " Vlastimil Babka
2022-11-24 1:20 ` Roman Gushchin
2022-11-24 9:09 ` Vlastimil Babka
2022-11-24 9:21 ` Christoph Lameter
2022-11-27 23:11 ` Vlastimil Babka
2022-11-21 17:11 ` [PATCH 08/12] mm, slub: refactor free debug processing Vlastimil Babka
2022-11-27 10:18 ` Hyeonggon Yoo
2022-11-21 17:11 ` [PATCH 09/12] mm, slub: split out allocations from pre/post hooks Vlastimil Babka
2022-11-27 10:54 ` Hyeonggon Yoo
2022-11-27 23:01 ` Vlastimil Babka
2022-11-28 13:06 ` Hyeonggon Yoo
2022-11-21 17:12 ` [PATCH 10/12] mm, slub: remove percpu slabs with CONFIG_SLUB_TINY Vlastimil Babka
2022-11-27 11:05 ` Hyeonggon Yoo
2022-12-12 10:54 ` Vlastimil Babka
2022-12-12 13:11 ` Dennis Zhou
2022-12-13 3:04 ` Baoquan He
2022-12-13 14:02 ` Hyeonggon Yoo
2022-12-18 10:16 ` Hyeonggon Yoo
2022-11-21 17:12 ` [PATCH 11/12] mm, slub: don't aggressively inline " Vlastimil Babka
2022-11-28 13:19 ` Hyeonggon Yoo
2022-11-21 17:12 ` [PATCH 12/12] mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED Vlastimil Babka
2022-11-21 17:12 ` Vlastimil Babka
2022-11-21 17:12 ` Vlastimil Babka
2022-11-21 17:12 ` Vlastimil Babka
2022-11-21 18:41 ` Aaro Koskinen
2022-11-21 18:41 ` Aaro Koskinen
2022-11-21 18:41 ` Aaro Koskinen
2022-11-21 18:41 ` Aaro Koskinen
2022-11-21 19:42 ` Vlastimil Babka
2022-11-21 19:42 ` Vlastimil Babka
2022-11-21 19:42 ` Vlastimil Babka
2022-11-21 19:42 ` Vlastimil Babka
2022-11-22 6:47 ` Damien Le Moal
2022-11-22 6:47 ` Damien Le Moal
2022-11-22 6:47 ` Damien Le Moal
2022-11-22 6:47 ` Damien Le Moal
2022-11-22 16:08 ` Arnd Bergmann
2022-11-22 16:08 ` Arnd Bergmann
2022-11-22 16:08 ` Arnd Bergmann
2022-11-22 16:08 ` Arnd Bergmann
2022-11-24 1:21 ` Roman Gushchin
2022-11-24 1:21 ` Roman Gushchin
2022-11-24 1:21 ` Roman Gushchin
2022-11-24 1:21 ` Roman Gushchin
2022-12-02 17:59 ` Palmer Dabbelt
2022-12-02 17:59 ` Palmer Dabbelt
2022-12-02 17:59 ` Palmer Dabbelt
2022-12-02 17:59 ` Palmer Dabbelt
2022-12-05 12:25 ` Damien Le Moal
2022-12-05 12:25 ` Damien Le Moal
2022-12-05 12:25 ` Damien Le Moal
2022-12-05 12:25 ` Damien Le Moal
2022-12-13 13:41 ` Hyeonggon Yoo
2022-12-13 13:41 ` Hyeonggon Yoo
2022-12-13 13:41 ` Hyeonggon Yoo
2022-12-13 13:41 ` Hyeonggon Yoo
2022-11-22 16:33 ` [PATCH 00/12] Introduce CONFIG_SLUB_TINY and deprecate SLOB Arnd Bergmann
2022-11-22 16:33 ` Arnd Bergmann
2022-11-22 16:33 ` Arnd Bergmann
2022-11-22 16:33 ` Arnd Bergmann
2022-11-22 16:59 ` Vlastimil Babka
2022-11-22 16:59 ` Vlastimil Babka
2022-11-22 16:59 ` Vlastimil Babka
2022-11-22 16:59 ` Vlastimil Babka
2022-11-22 17:15 ` Arnd Bergmann
2022-11-22 17:15 ` Arnd Bergmann
2022-11-22 17:15 ` Arnd Bergmann
2022-11-22 17:15 ` Arnd Bergmann
2022-11-24 20:30 ` Mike Rapoport
2022-11-24 20:30 ` Mike Rapoport
2022-11-24 20:30 ` Mike Rapoport
2022-11-24 20:30 ` Mike Rapoport
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