linux-kernel - Re: [PATCH 3/4] mm/mm_init: drop deferred_init

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Message-ID: <20250819092254.cddlg6npwl75fvbn@master>
Date: Tue, 19 Aug 2025 09:22:54 +0000
From: Wei Yang <richard.weiyang@...il.com>
To: David Hildenbrand <david@...hat.com>
Cc: Mike Rapoport <rppt@...nel.org>, linux-mm@...ck.org,
	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 3/4] mm/mm_init: drop deferred_init_maxorder()

On Tue, Aug 19, 2025 at 09:54:22AM +0200, David Hildenbrand wrote:
>> -static unsigned long __init
>> -deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn,
>> -			   struct zone *zone)
>> -{
>> -	unsigned long nr_pages = 0;
>> -	unsigned long spfn, epfn;
>> -	u64 i = 0;
>> +		while (spfn < epfn) {
>> +			unsigned long mo_pfn = ALIGN(spfn + 1, MAX_ORDER_NR_PAGES);
>> +			unsigned long chunk_end = min(mo_pfn, epfn);
>> -	deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, start_pfn);
>> +			nr_pages += deferred_init_pages(zone, spfn, chunk_end);
>> +			deferred_free_pages(spfn, chunk_end - spfn);
>
>
>I assume the expectation is that all PFNs in the start_pfn -> end_pfn range
>will go to this zone, correct?

I think so.

defer_init only apply to the highest zone in one node.

>
>-- 
>Cheers
>
>David / dhildenb
>

-- 
Wei Yang
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