linux-kernel - Re: [PATCH 0/4] mm/mm_init: simplify deferred init of struct pages

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Message-ID: <aKgGGLEcLEKEHt0Q@kernel.org>
Date: Fri, 22 Aug 2025 08:54:32 +0300
From: Mike Rapoport <rppt@...nel.org>
To: 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>,
	Wei Yang <richard.weiyang@...il.com>, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH 0/4] mm/mm_init: simplify deferred init of struct pages

On Mon, Aug 18, 2025 at 09:46:11AM +0300, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> Hi,
> 
> These patches simplify deferred initialization of the memory map.
> 
> Beside nice negative diffstat I measured 3ms reduction in the
> initialization of deferred pages on single node system with 64GiB of RAM.
> 
> I don't have access to large memory machines, so I'd really appreciate
> testing of these patches on them to make sure there's no regression there.
> 
> The patches are also available at git:
> https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=deferred-memmap-init/v1
> 
> Mike Rapoport (Microsoft) (4):
>   mm/mm_init: use deferred_init_memmap_chunk() in deferred_grow_zone()
>   mm/mm_init: deferred_init_memmap: use a job per zone
>   mm/mm_init: drop deferred_init_maxorder()
>   memblock: drop for_each_free_mem_pfn_range_in_zone_from()

I've added those to memblock tree
 
>  .clang-format            |   1 -
>  include/linux/memblock.h |  22 -----
>  mm/memblock.c            |  64 -------------
>  mm/mm_init.c             | 195 +++++++++++++--------------------------
>  4 files changed, 62 insertions(+), 220 deletions(-)
> 
> 
> base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
> -- 
> 2.50.1
> 

-- 
Sincerely yours,
Mike.