[PATCH v6 4/6] tunables: Add glibc.elf.hugetlb tunable for THP-aware segment alignment

[Wilco Dijkstra]

Hi Rui,

> Introduce a new tunable, `glibc.elf.hugetlb`, to control
> Transparent Huge Page (THP) aware alignment of ELF loadable segments.
>
> When set to `1`, the dynamic loader will attempt to align sufficiently
> large `PT_LOAD` segments to the PMD huge page size when mapping them.
> This increases the likelihood that the kernel backs these mappings with
> Transparent Huge Pages.
>
> The default value is `0`, which preserves the traditional page-sized
> alignment and keeps existing behavior unchanged.
> 
> On systems without THP support, or when THP is disabled in the kernel,
> enabling this tunable has no effect.

Looks good to me.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

Cheers,
Wilco