linux-kernel - Re: [PATCH 1/4] mm/mm_init: use deferred_init_memmap_chunk() in deferred_grow

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Message-ID: <557f34ed-114b-48ff-8c01-ca9c939da08f@redhat.com>
Date: Tue, 19 Aug 2025 09:44:01 +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 1/4] mm/mm_init: use deferred_init_memmap_chunk() in
 deferred_grow_zone()

On 18.08.25 08:46, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> deferred_grow_zone() initializes one or more sections in the memory map
> if buddy runs out of initialized struct pages when
> CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled.
> 
> It loops through memblock regions and initializes and frees pages in
> MAX_ORDER_NR_PAGES chunks.
> 
> Essentially the same loop is implemented in deferred_init_memmap_chunk(),
> the only actual difference is that deferred_init_memmap_chunk() does not
> count initialized pages.
> 
> Make deferred_init_memmap_chunk() count the initialized pages and return
> their number, wrap it with deferred_init_memmap_job() for multithreaded
> initialization with padata_do_multithreaded() and replace open-coded
> initialization of struct pages in deferred_grow_zone() with a call to
> deferred_init_memmap_chunk().
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

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

-- 
Cheers

David / dhildenb