[{"id":3677745,"web_url":"http://patchwork.ozlabs.org/comment/3677745/","msgid":"","date":"2026-04-15T15:55:17","subject":"Re: [PATCH v2 2/6] mm/sparse-vmemmap: Pass @pgmap argument to memory\n deactivation paths","submitter":{"id":77733,"url":"http://patchwork.ozlabs.org/api/people/77733/","name":"Mike Rapoport","email":"rppt@kernel.org"},"content":"On Wed, Apr 15, 2026 at 07:14:08PM +0800, Muchun Song wrote:\n> Currently, the memory hot-remove call chain -- arch_remove_memory(),\n> __remove_pages(), sparse_remove_section() and section_deactivate() --\n> does not carry the struct dev_pagemap pointer. This prevents the lower\n> levels from knowing whether the section was originally populated with\n> vmemmap optimizations (e.g., DAX with vmemmap optimization enabled).\n> \n> Without this information, we cannot call vmemmap_can_optimize() to\n> determine if the vmemmap pages were optimized. As a result, the vmemmap\n> page accounting during teardown will mistakenly assume a non-optimized\n> allocation, leading to incorrect memmap statistics.\n> \n> To lay the groundwork for fixing the vmemmap page accounting, we need\n> to pass the @pgmap pointer down to the deactivation location. Plumb the\n> @pgmap argument through the APIs of arch_remove_memory(), __remove_pages()\n> and sparse_remove_section(), mirroring the corresponding *_activate()\n> paths.\n> \n> Signed-off-by: Muchun Song \n\nAcked-by: Mike Rapoport (Microsoft) \n\n> ---\n> arch/arm64/mm/mmu.c | 5 +++--\n> arch/loongarch/mm/init.c | 5 +++--\n> arch/powerpc/mm/mem.c | 5 +++--\n> arch/riscv/mm/init.c | 5 +++--\n> arch/s390/mm/init.c | 5 +++--\n> arch/x86/mm/init_64.c | 5 +++--\n> include/linux/memory_hotplug.h | 8 +++++---\n> mm/memory_hotplug.c | 12 ++++++------\n> mm/memremap.c | 4 ++--\n> mm/sparse-vmemmap.c | 17 +++++++++--------\n> 10 files changed, 40 insertions(+), 31 deletions(-)\n> \n> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c\n> index dd85e093ffdb..e5a42b7a0160 100644\n> --- a/arch/arm64/mm/mmu.c\n> +++ b/arch/arm64/mm/mmu.c\n> @@ -2024,12 +2024,13 @@ int arch_add_memory(int nid, u64 start, u64 size,\n> \treturn ret;\n> }\n> \n> -void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> +void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\tstruct dev_pagemap *pgmap)\n> {\n> \tunsigned long start_pfn = start >> PAGE_SHIFT;\n> \tunsigned long nr_pages = size >> PAGE_SHIFT;\n> \n> -\t__remove_pages(start_pfn, nr_pages, altmap);\n> +\t__remove_pages(start_pfn, nr_pages, altmap, pgmap);\n> \t__remove_pgd_mapping(swapper_pg_dir, __phys_to_virt(start), size);\n> }\n> \n> diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c\n> index 00f3822b6e47..c9c57f08fa2c 100644\n> --- a/arch/loongarch/mm/init.c\n> +++ b/arch/loongarch/mm/init.c\n> @@ -86,7 +86,8 @@ int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)\n> \treturn ret;\n> }\n> \n> -void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> +void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\tstruct dev_pagemap *pgmap)\n> {\n> \tunsigned long start_pfn = start >> PAGE_SHIFT;\n> \tunsigned long nr_pages = size >> PAGE_SHIFT;\n> @@ -95,7 +96,7 @@ void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> \t/* With altmap the first mapped page is offset from @start */\n> \tif (altmap)\n> \t\tpage += vmem_altmap_offset(altmap);\n> -\t__remove_pages(start_pfn, nr_pages, altmap);\n> +\t__remove_pages(start_pfn, nr_pages, altmap, pgmap);\n> }\n> #endif\n> \n> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c\n> index 648d0c5602ec..4c1afab91996 100644\n> --- a/arch/powerpc/mm/mem.c\n> +++ b/arch/powerpc/mm/mem.c\n> @@ -158,12 +158,13 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,\n> \treturn rc;\n> }\n> \n> -void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> +void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\t struct dev_pagemap *pgmap)\n> {\n> \tunsigned long start_pfn = start >> PAGE_SHIFT;\n> \tunsigned long nr_pages = size >> PAGE_SHIFT;\n> \n> -\t__remove_pages(start_pfn, nr_pages, altmap);\n> +\t__remove_pages(start_pfn, nr_pages, altmap, pgmap);\n> \tarch_remove_linear_mapping(start, size);\n> }\n> #endif\n> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c\n> index decd7df40fa4..b0092fb842a3 100644\n> --- a/arch/riscv/mm/init.c\n> +++ b/arch/riscv/mm/init.c\n> @@ -1717,9 +1717,10 @@ int __ref arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *param\n> \treturn ret;\n> }\n> \n> -void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> +void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\t struct dev_pagemap *pgmap)\n> {\n> -\t__remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap);\n> +\t__remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap, pgmap);\n> \tremove_linear_mapping(start, size);\n> \tflush_tlb_all();\n> }\n> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c\n> index 1f72efc2a579..11a689423440 100644\n> --- a/arch/s390/mm/init.c\n> +++ b/arch/s390/mm/init.c\n> @@ -276,12 +276,13 @@ int arch_add_memory(int nid, u64 start, u64 size,\n> \treturn rc;\n> }\n> \n> -void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> +void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\tstruct dev_pagemap *pgmap)\n> {\n> \tunsigned long start_pfn = start >> PAGE_SHIFT;\n> \tunsigned long nr_pages = size >> PAGE_SHIFT;\n> \n> -\t__remove_pages(start_pfn, nr_pages, altmap);\n> +\t__remove_pages(start_pfn, nr_pages, altmap, pgmap);\n> \tvmem_remove_mapping(start, size);\n> }\n> #endif /* CONFIG_MEMORY_HOTPLUG */\n> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c\n> index df2261fa4f98..77b889b71cf3 100644\n> --- a/arch/x86/mm/init_64.c\n> +++ b/arch/x86/mm/init_64.c\n> @@ -1288,12 +1288,13 @@ kernel_physical_mapping_remove(unsigned long start, unsigned long end)\n> \tremove_pagetable(start, end, true, NULL);\n> }\n> \n> -void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)\n> +void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\t struct dev_pagemap *pgmap)\n> {\n> \tunsigned long start_pfn = start >> PAGE_SHIFT;\n> \tunsigned long nr_pages = size >> PAGE_SHIFT;\n> \n> -\t__remove_pages(start_pfn, nr_pages, altmap);\n> +\t__remove_pages(start_pfn, nr_pages, altmap, pgmap);\n> \tkernel_physical_mapping_remove(start, start + size);\n> }\n> #endif /* CONFIG_MEMORY_HOTPLUG */\n> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h\n> index 815e908c4135..7c9d66729c60 100644\n> --- a/include/linux/memory_hotplug.h\n> +++ b/include/linux/memory_hotplug.h\n> @@ -135,9 +135,10 @@ static inline bool movable_node_is_enabled(void)\n> \treturn movable_node_enabled;\n> }\n> \n> -extern void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap);\n> +extern void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap,\n> +\t\t\t struct dev_pagemap *pgmap);\n> extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,\n> -\t\t\t struct vmem_altmap *altmap);\n> +\t\t\t struct vmem_altmap *altmap, struct dev_pagemap *pgmap);\n> \n> /* reasonably generic interface to expand the physical pages */\n> extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,\n> @@ -307,7 +308,8 @@ extern int sparse_add_section(int nid, unsigned long pfn,\n> \t\tunsigned long nr_pages, struct vmem_altmap *altmap,\n> \t\tstruct dev_pagemap *pgmap);\n> extern void sparse_remove_section(unsigned long pfn, unsigned long nr_pages,\n> -\t\t\t\t struct vmem_altmap *altmap);\n> +\t\t\t\t struct vmem_altmap *altmap,\n> +\t\t\t\t struct dev_pagemap *pgmap);\n> extern struct zone *zone_for_pfn_range(enum mmop online_type,\n> \t\tint nid, struct memory_group *group, unsigned long start_pfn,\n> \t\tunsigned long nr_pages);\n> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c\n> index 2a943ec57c85..6a9e2dc751d2 100644\n> --- a/mm/memory_hotplug.c\n> +++ b/mm/memory_hotplug.c\n> @@ -583,7 +583,7 @@ void remove_pfn_range_from_zone(struct zone *zone,\n> * calling offline_pages().\n> */\n> void __remove_pages(unsigned long pfn, unsigned long nr_pages,\n> -\t\t struct vmem_altmap *altmap)\n> +\t\t struct vmem_altmap *altmap, struct dev_pagemap *pgmap)\n> {\n> \tconst unsigned long end_pfn = pfn + nr_pages;\n> \tunsigned long cur_nr_pages;\n> @@ -598,7 +598,7 @@ void __remove_pages(unsigned long pfn, unsigned long nr_pages,\n> \t\t/* Select all remaining pages up to the next section boundary */\n> \t\tcur_nr_pages = min(end_pfn - pfn,\n> \t\t\t\t SECTION_ALIGN_UP(pfn + 1) - pfn);\n> -\t\tsparse_remove_section(pfn, cur_nr_pages, altmap);\n> +\t\tsparse_remove_section(pfn, cur_nr_pages, altmap, pgmap);\n> \t}\n> }\n> \n> @@ -1425,7 +1425,7 @@ static void remove_memory_blocks_and_altmaps(u64 start, u64 size)\n> \n> \t\tremove_memory_block_devices(cur_start, memblock_size);\n> \n> -\t\tarch_remove_memory(cur_start, memblock_size, altmap);\n> +\t\tarch_remove_memory(cur_start, memblock_size, altmap, NULL);\n> \n> \t\t/* Verify that all vmemmap pages have actually been freed. */\n> \t\tWARN(altmap->alloc, \"Altmap not fully unmapped\");\n> @@ -1468,7 +1468,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group,\n> \t\tret = create_memory_block_devices(cur_start, memblock_size, nid,\n> \t\t\t\t\t\t params.altmap, group);\n> \t\tif (ret) {\n> -\t\t\tarch_remove_memory(cur_start, memblock_size, NULL);\n> +\t\t\tarch_remove_memory(cur_start, memblock_size, NULL, NULL);\n> \t\t\tkfree(params.altmap);\n> \t\t\tgoto out;\n> \t\t}\n> @@ -1554,7 +1554,7 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)\n> \t\t/* create memory block devices after memory was added */\n> \t\tret = create_memory_block_devices(start, size, nid, NULL, group);\n> \t\tif (ret) {\n> -\t\t\tarch_remove_memory(start, size, params.altmap);\n> +\t\t\tarch_remove_memory(start, size, params.altmap, NULL);\n> \t\t\tgoto error;\n> \t\t}\n> \t}\n> @@ -2266,7 +2266,7 @@ static int try_remove_memory(u64 start, u64 size)\n> \t\t * No altmaps present, do the removal directly\n> \t\t */\n> \t\tremove_memory_block_devices(start, size);\n> -\t\tarch_remove_memory(start, size, NULL);\n> +\t\tarch_remove_memory(start, size, NULL, NULL);\n> \t} else {\n> \t\t/* all memblocks in the range have altmaps */\n> \t\tremove_memory_blocks_and_altmaps(start, size);\n> diff --git a/mm/memremap.c b/mm/memremap.c\n> index ac7be07e3361..c45b90f334ea 100644\n> --- a/mm/memremap.c\n> +++ b/mm/memremap.c\n> @@ -97,10 +97,10 @@ static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)\n> \t\t\t\t PHYS_PFN(range_len(range)));\n> \tif (pgmap->type == MEMORY_DEVICE_PRIVATE) {\n> \t\t__remove_pages(PHYS_PFN(range->start),\n> -\t\t\t PHYS_PFN(range_len(range)), NULL);\n> +\t\t\t PHYS_PFN(range_len(range)), NULL, pgmap);\n> \t} else {\n> \t\tarch_remove_memory(range->start, range_len(range),\n> -\t\t\t\tpgmap_altmap(pgmap));\n> +\t\t\t\tpgmap_altmap(pgmap), pgmap);\n> \t\tkasan_remove_zero_shadow(__va(range->start), range_len(range));\n> \t}\n> \tmem_hotplug_done();\n> diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c\n> index a7b11248b989..40290fbc1db4 100644\n> --- a/mm/sparse-vmemmap.c\n> +++ b/mm/sparse-vmemmap.c\n> @@ -665,7 +665,7 @@ static struct page * __meminit populate_section_memmap(unsigned long pfn,\n> }\n> \n> static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,\n> -\t\tstruct vmem_altmap *altmap)\n> +\t\tstruct vmem_altmap *altmap, struct dev_pagemap *pgmap)\n> {\n> \tunsigned long start = (unsigned long) pfn_to_page(pfn);\n> \tunsigned long end = start + nr_pages * sizeof(struct page);\n> @@ -674,7 +674,8 @@ static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,\n> \tvmemmap_free(start, end, altmap);\n> }\n> \n> -static void free_map_bootmem(struct page *memmap)\n> +static void free_map_bootmem(struct page *memmap, struct vmem_altmap *altmap,\n> +\t\tstruct dev_pagemap *pgmap)\n> {\n> \tunsigned long start = (unsigned long)memmap;\n> \tunsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);\n> @@ -746,7 +747,7 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)\n> * usage map, but still need to free the vmemmap range.\n> */\n> static void section_deactivate(unsigned long pfn, unsigned long nr_pages,\n> -\t\tstruct vmem_altmap *altmap)\n> +\t\tstruct vmem_altmap *altmap, struct dev_pagemap *pgmap)\n> {\n> \tstruct mem_section *ms = __pfn_to_section(pfn);\n> \tbool section_is_early = early_section(ms);\n> @@ -784,9 +785,9 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,\n> \t * section_activate() and pfn_valid() .\n> \t */\n> \tif (!section_is_early)\n> -\t\tdepopulate_section_memmap(pfn, nr_pages, altmap);\n> +\t\tdepopulate_section_memmap(pfn, nr_pages, altmap, pgmap);\n> \telse if (memmap)\n> -\t\tfree_map_bootmem(memmap);\n> +\t\tfree_map_bootmem(memmap, altmap, pgmap);\n> \n> \tif (empty)\n> \t\tms->section_mem_map = (unsigned long)NULL;\n> @@ -828,7 +829,7 @@ static struct page * __meminit section_activate(int nid, unsigned long pfn,\n> \n> \tmemmap = populate_section_memmap(pfn, nr_pages, nid, altmap, pgmap);\n> \tif (!memmap) {\n> -\t\tsection_deactivate(pfn, nr_pages, altmap);\n> +\t\tsection_deactivate(pfn, nr_pages, altmap, pgmap);\n> \t\treturn ERR_PTR(-ENOMEM);\n> \t}\n> \n> @@ -889,13 +890,13 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn,\n> }\n> \n> void sparse_remove_section(unsigned long pfn, unsigned long nr_pages,\n> -\t\t\t struct vmem_altmap *altmap)\n> +\t\t\t struct vmem_altmap *altmap, struct dev_pagemap *pgmap)\n> {\n> \tstruct mem_section *ms = __pfn_to_section(pfn);\n> \n> \tif (WARN_ON_ONCE(!valid_section(ms)))\n> \t\treturn;\n> \n> -\tsection_deactivate(pfn, nr_pages, altmap);\n> +\tsection_deactivate(pfn, nr_pages, altmap, pgmap);\n> }\n> #endif /* CONFIG_MEMORY_HOTPLUG */\n> -- \n> 2.20.1\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=FN3T4pdX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19779-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=172.234.252.31","lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1776268526;\n\tbh=iwixORW5qtkGBB6dbk60dbN6Q9CKk75q8eWQsJtSYvo=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=FN3T4pdXOcDMmuVqXAKyLFrDTss8cLQMRFGw8K7CpoF2nEsb7j5cXLDUjSBb4ea4l\n\t obR8VUcNr4M4SY2jJ+wft0MXcOKnw+YHpoazAsumBmwPzVT/FVzFxRrfo9e/ysr33N\n\t t+0s1GAYeDmf2mua+idCxuHVlTFp+Hh4Je1KnUrVDG8bSdNuSAirsS5Lil3t6OxbiS\n\t 7Ccqac33uvsQ4JPOMWAJBb4pCBoAjWIyuQiGBx48gPIVQbBCd0f/HhANjb70RDS/xZ\n\t vo7/C/i2DAmxueq1DilcDdUlRD2BQpipPWlca498c/StaRMbBmCrM66q6NiPWHbieg\n\t N0kR+tOvjG+5A==","Date":"Wed, 15 Apr 2026 18:55:17 +0300","From":"Mike Rapoport ","To":"Muchun Song ","Cc":"Andrew Morton ,\n\tDavid Hildenbrand ,\n\tMuchun Song ,\n\tOscar Salvador ,\n\tMichael Ellerman ,\n\tMadhavan Srinivasan ,\n\tLorenzo Stoakes ,\n\t\"Liam R . Howlett\" ,\n\tVlastimil Babka ,\n\tSuren Baghdasaryan ,\n\tMichal Hocko , Nicholas Piggin ,\n\tChristophe Leroy , aneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com, linux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org","Subject":"Re: [PATCH v2 2/6] mm/sparse-vmemmap: Pass @pgmap argument to memory\n deactivation paths","Message-ID":"","References":"<20260415111412.1003526-1-songmuchun@bytedance.com>\n <20260415111412.1003526-3-songmuchun@bytedance.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260415111412.1003526-3-songmuchun@bytedance.com>","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}}]