linux-kernel - Re: [PATCH 2/4] mm/mm_init: deferred_init

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Message-ID: <b6e79117-bc16-41d9-b981-3610ee2919b5@redhat.com>
Date: Tue, 19 Aug 2025 09:45:11 +0200
From: David Hildenbrand <david@...hat.com>
To: Mike Rapoport <rppt@...nel.org>, linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Bill Wendling <morbo@...gle.com>, Daniel Jordan
 <daniel.m.jordan@...cle.com>, Justin Stitt <justinstitt@...gle.com>,
 Michael Ellerman <mpe@...erman.id.au>, Miguel Ojeda <ojeda@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 2/4] mm/mm_init: deferred_init_memmap: use a job per zone

On 18.08.25 08:46, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> 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@...nel.org>
> ---

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb