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From: Muchun Song <muchun.song@linux.dev>
To: Joao Martins <joao.m.martins@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>,
	Lorenzo Stoakes <ljs@kernel.org>,
	"Liam R . Howlett" <Liam.Howlett@oracle.com>,
	Vlastimil Babka <vbabka@kernel.org>,
	Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Christophe Leroy <chleroy@kernel.org>,
	aneesh.kumar@linux.ibm.com, linux-mm@kvack.org,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	harry.yoo@oracle.com, Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Oscar Salvador <osalvador@suse.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Madhavan Srinivasan <maddy@linux.ibm.com>
Subject: Re: [PATCH v2 4/6] mm/sparse-vmemmap: Pass @pgmap argument to arch vmemmap_populate()
Date: Wed, 15 Apr 2026 20:21:45 +0800	[thread overview]
Message-ID: <FE14CDAA-32AC-48C3-AB9E-31F6B47843AB@linux.dev> (raw)
In-Reply-To: <9ceede7b-45d3-4d15-b8ce-f0b04bbb18dd@oracle.com>



> On Apr 15, 2026, at 20:13, Joao Martins <joao.m.martins@oracle.com> wrote:
> 
> On 15/04/2026 12:14, Muchun Song wrote:
>> Add the struct dev_pagemap pointer as a parameter to the architecture
>> specific vmemmap_populate(), vmemmap_populate_hugepages() and
>> vmemmap_populate_basepages() functions.
>> 
>> Currently, the vmemmap optimization for DAX is handled mostly in an
>> architecture-agnostic way via vmemmap_populate_compound_pages().
>> However, this approach skips crucial architecture-specific initialization
>> steps. For example, the x86 path must call sync_global_pgds() after
>> populating the vmemmap, which is currently being bypassed.
>> 
> 
> Harry's series fixed in a different way (for x86):
> 
> https://lore.kernel.org/linux-mm/20250818020206.4517-1-harry.yoo@oracle.com/#t

Thanks for your information. It indeed fixes the page table sync issue.

I'll drop this one int the next version.

Thanks,
Muhcun

  reply	other threads:[~2026-04-15 12:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-15 11:14 [PATCH v2 0/6] mm: Fix vmemmap optimization accounting and initialization Muchun Song
2026-04-15 11:14 ` [PATCH v2 1/6] mm/sparse-vmemmap: Fix vmemmap accounting underflow Muchun Song
2026-04-15 11:26   ` Muchun Song
2026-04-15 15:53   ` Mike Rapoport
2026-04-15 11:14 ` [PATCH v2 2/6] mm/sparse-vmemmap: Pass @pgmap argument to memory deactivation paths Muchun Song
2026-04-15 15:55   ` Mike Rapoport
2026-04-15 11:14 ` [PATCH v2 3/6] mm/sparse-vmemmap: Fix DAX vmemmap accounting with optimization Muchun Song
2026-04-15 15:58   ` Mike Rapoport
2026-04-15 11:14 ` [PATCH v2 4/6] mm/sparse-vmemmap: Pass @pgmap argument to arch vmemmap_populate() Muchun Song
2026-04-15 12:13   ` Joao Martins
2026-04-15 12:21     ` Muchun Song [this message]
2026-04-15 11:14 ` [PATCH v2 5/6] mm/sparse-vmemmap: Fix missing architecture-specific page table sync Muchun Song
2026-04-15 11:14 ` [PATCH v2 6/6] mm/mm_init: Fix pageblock migratetype for ZONE_DEVICE compound pages Muchun Song

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