On Mon, Nov 20, 2023 at 6:12 PM <sxwjean@xxxxxx> wrote:
>
> From: Xiongwei Song <xiongwei.song@xxxxxxxxxxxxx>
>
> Since slab allocatoer has already been removed, so we should also remove
> the related parameters. And change the global flag from slab_nomerge
> to slub_nomerge.
No, kernel parameters should be changed only in a backward-compatible
way (if possible)
Before slab merging was supported in SLAB, only SLUB supported it.
After commit 423c929cbbec ("mm/slab_common: commonize slab merge logic"), using
slab_[no]merge parameters for CONFIG_SLUB builds became legal.
I think what the documentation says is "slab_[no]merge enables or
disables slab merging
and slub_[no]merge remain supported only for backward compatibility"
>
> Signed-off-by: Xiongwei Song <xiongwei.song@xxxxxxxxxxxxx>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 11 ++---------
> mm/Kconfig | 2 +-
> mm/slab_common.c | 13 +++++--------
> 3 files changed, 8 insertions(+), 18 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index c7709a11f8ce..afca9ff7c9f0 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -5870,11 +5870,11 @@
>
> slram= [HW,MTD]
>
> - slab_merge [MM]
> + slub_merge [MM]
> Enable merging of slabs with similar size when the
> kernel is built without CONFIG_SLAB_MERGE_DEFAULT.
>
> - slab_nomerge [MM]
> + slub_nomerge [MM]
> Disable merging of slabs with similar size. May be
> necessary if there is some reason to distinguish
> allocs to different slabs, especially in hardened
> @@ -5915,13 +5915,6 @@
> lower than slub_max_order.
> For more information see Documentation/mm/slub.rst.
>
> - slub_merge [MM, SLUB]
> - Same with slab_merge.
> -
> - slub_nomerge [MM, SLUB]
> - Same with slab_nomerge. This is supported for legacy.
> - See slab_nomerge for more information.
> -
> smart2= [HW]
> Format: <io1>[,<io2>[,...,<io8>]]
