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>
