Re: [PATCH 2/4] mm/mm_init: deferred_init_memmap: use a job per zone

[David Hildenbrand]

On 18.08.25 08:46, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>
>
> deferred_init_memmap() loops over free memory ranges and creates a
> padata_mt_job for every free range that intersects with the zone being
> initialized.
>
> padata_do_multithreaded() then splits every such range to several chunks
> and runs a thread that initializes struct pages in that chunk using
> deferred_init_memmap_chunk(). The number of threads is limited by amount of
> the CPUs on the node (or 1 for memoryless nodes).
>
> Looping through free memory ranges is then repeated in
> deferred_init_memmap_chunk() first to find the first range that should be
> initialized and then to traverse the ranges until the end of the chunk is
> reached.
>
> Remove the loop over free memory regions in deferred_init_memmap() and pass
> the entire zone to padata_do_multithreaded() so that it will be divided to
> several chunks by the parallelization code.
>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
> ---

Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers

David / dhildenb