On Tue, May 23, 2023 at 6:12 PM Vlastimil Babka <vbabka@xxxxxxx> wrote:
As discussed at LSF/MM [1] [2] and with no objections raised there,
deprecate the SLAB allocator. Rename the user-visible option so that
users with CONFIG_SLAB=y get a new prompt with explanation during make
oldconfig, while make olddefconfig will just switch to SLUB.
In all defconfigs with CONFIG_SLAB=y remove the line so those also
switch to SLUB. Regressions due to the switch should be reported to
linux-mm and slab maintainers.
[1] https://lore.kernel.org/all/4b9fc9c6-b48c-198f-5f80-811a44737e5f@xxxxxxx/
[2] https://lwn.net/Articles/932201/
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
---
<snip>
diff --git a/mm/Kconfig b/mm/Kconfig
index 7672a22647b4..b537c4436d18 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -218,11 +218,18 @@ choice
help
This option allows to select a slab allocator.
-config SLAB
- bool "SLAB"
+config SLAB_DEPRECATED
+ bool "SLAB (DEPRECATED)"
depends on !PREEMPT_RT
select HAVE_HARDENED_USERCOPY_ALLOCATOR
help
+ Deprecated and scheduled for removal in a few cycles. Replaced by
+ SLUB.
+
+ If you cannot migrate to SLUB, please contact linux-mm@xxxxxxxxx
+ and the people listed in the SLAB ALLOCATOR section of MAINTAINERS
+ file, explaining why.
+
The regular slab allocator that is established and known to work
well in all environments. It organizes cache hot objects in
per cpu and per node queues.
@@ -240,6 +247,11 @@ config SLUB
endchoice
+config SLAB
+ bool
+ default y
+ depends on SLAB_DEPRECATED
+
config SLUB_TINY
bool "Configure SLUB for minimal memory footprint"
depends on SLUB && EXPERT
--
2.40.1
Thank you for the work!
It looks good to me.
let's see some users raise their voice.
Acked-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
