On 5/24/23 02:29, David Rientjes wrote:
On Tue, 23 May 2023, Vlastimil Babka 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>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Thanks.
The Kconfig option says that SLAB will be removed in a few cycles. I
think we should wait until at least the next LTS kernel is forked at the
end of the year so that users who upgrade to only the LTS releases can be
prompted for this change and surface any concerns. Slab allocation is a
critical subsystem, so I presume this is the safest and most responsible
way to do the SLAB deprecation. Hopefully that timeline works for
everybody.
Sure, and in fact looking at predicted release dates [1], if the deprecation
goes into 6.5 then 6.7 ("few" == 2) is already end of January 2024, anyway.
[1] https://hansen.beer/~dave/phb/
