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Mon, 22 Dec 2025 14:06:58 +0000 Message-ID: <0b166dd0-c368-4586-9c4b-16f5e104108a@intel.com> Date: Mon, 22 Dec 2025 22:06:48 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 2/2] mm/memory hotplug: fix zone->contiguous always false when hotplug From: "Li, Tianyou" To: Mike Rapoport , Oscar Salvador , "David Hildenbrand" , Wei Yang CC: , Yong Hu , Nanhai Zou , Yuan Liu , Tim Chen , Qiuxu Zhuo , Yu C Chen , Pan Deng , Chen Zhang , References: <20251215130437.3914342-1-tianyou.li@intel.com> <20251215130437.3914342-3-tianyou.li@intel.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR02CA0011.apcprd02.prod.outlook.com (2603:1096:3:17::23) To MW4PR11MB8289.namprd11.prod.outlook.com (2603:10b6:303:1e8::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW4PR11MB8289:EE_|SA2PR11MB4810:EE_ X-MS-Office365-Filtering-Correlation-Id: 782e8203-5b3b-40ed-491e-08de41635e90 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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Patch v7 has been tested by Yuan Liu and sent for your kind review. Looking forward to your comments. Thanks. Regards, Tianyou On 12/19/2025 10:33 PM, Li, Tianyou wrote: > > On 12/19/2025 5:37 PM, Mike Rapoport wrote: >> Hi, >> >> On Mon, Dec 15, 2025 at 09:04:37PM +0800, Tianyou Li wrote: >>> From: Yuan Liu >>> >>> Function set_zone_contiguous used __pageblock_pfn_to_page to >>> check the whole pageblock is in the same zone. One assumption is >>> the memory section must online, otherwise the __pageblock_pfn_to_page >>> will return NULL, then the set_zone_contiguous will be false. >>> When move_pfn_range_to_zone invoked set_zone_contiguous, since the >>> memory section did not online, the return value will always be false. >>> >>> To fix this issue, we removed the set_zone_contiguous from the >>> move_pfn_range_to_zone, and place it after memory section onlined. >>> >>> Function remove_pfn_range_from_zone did not have this issue because >>> memory section remains online at the time set_zone_contiguous invoked. >> Since the fix is relevant even without the optimization patch, can we >> please reorder the patches so that the fix will be the first in the >> series? >> Than it can be applied to stable trees as well. > > > Thanks for the comments. That's totally make sense. I will work on the > patch v7, will rebase with 6.19-rc1. I will be out of office next > week, probably slow response but will keep working on the patch with > Yuan Liu. Thanks. > > > Regards, > > Tianyou > > >>> Reviewed-by: Tianyou Li >>> Reviewed-by: Nanhai Zou >>> Signed-off-by: Yuan Liu >>> --- >>>   mm/memory_hotplug.c | 18 ++++++++++++++---- >>>   1 file changed, 14 insertions(+), 4 deletions(-) >>> >>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c >>> index 12839032ad42..0220021f6a68 100644 >>> --- a/mm/memory_hotplug.c >>> +++ b/mm/memory_hotplug.c >>> @@ -810,8 +810,7 @@ void move_pfn_range_to_zone(struct zone *zone, >>> unsigned long start_pfn, >>>   { >>>       struct pglist_data *pgdat = zone->zone_pgdat; >>>       int nid = pgdat->node_id; >>> -    const enum zone_contig_state new_contiguous_state = >>> -        zone_contig_state_after_growing(zone, start_pfn, nr_pages); >>> + >>>       clear_zone_contiguous(zone); >>>         if (zone_is_empty(zone)) >>> @@ -841,8 +840,6 @@ void move_pfn_range_to_zone(struct zone *zone, >>> unsigned long start_pfn, >>>       memmap_init_range(nr_pages, nid, zone_idx(zone), start_pfn, 0, >>>                MEMINIT_HOTPLUG, altmap, migratetype, >>>                isolate_pageblock); >>> - >>> -    set_zone_contiguous(zone, new_contiguous_state); >>>   } >>>     struct auto_movable_stats { >>> @@ -1151,6 +1148,7 @@ int mhp_init_memmap_on_memory(unsigned long >>> pfn, unsigned long nr_pages, >>>   { >>>       unsigned long end_pfn = pfn + nr_pages; >>>       int ret, i; >>> +    enum zone_contig_state new_contiguous_state = ZONE_CONTIG_NO; >>>         ret = kasan_add_zero_shadow(__va(PFN_PHYS(pfn)), >>> PFN_PHYS(nr_pages)); >>>       if (ret) >>> @@ -1165,6 +1163,14 @@ int mhp_init_memmap_on_memory(unsigned long >>> pfn, unsigned long nr_pages, >>>       if (mhp_off_inaccessible) >>>           page_init_poison(pfn_to_page(pfn), sizeof(struct page) * >>> nr_pages); >>>   +    /* >>> +     * If the allocated memmap pages are not in a full section, >>> keep the >>> +     * contiguous state as ZONE_CONTIG_NO. >>> +     */ >>> +    if (IS_ALIGNED(end_pfn, PAGES_PER_SECTION)) >>> +        new_contiguous_state = zone_contig_state_after_growing(zone, >>> +                                pfn, nr_pages); >>> + >>>       move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, >>> MIGRATE_UNMOVABLE, >>>                      false); >>>   @@ -1183,6 +1189,7 @@ int mhp_init_memmap_on_memory(unsigned long >>> pfn, unsigned long nr_pages, >>>       if (nr_pages >= PAGES_PER_SECTION) >>>               online_mem_sections(pfn, ALIGN_DOWN(end_pfn, >>> PAGES_PER_SECTION)); >>>   +    set_zone_contiguous(zone, new_contiguous_state); >>>       return ret; >>>   } >>>   @@ -1221,6 +1228,7 @@ int online_pages(unsigned long pfn, unsigned >>> long nr_pages, >>>       }; >>>       const int nid = zone_to_nid(zone); >>>       int need_zonelists_rebuild = 0; >>> +    enum zone_contig_state new_contiguous_state = ZONE_CONTIG_NO; >>>       unsigned long flags; >>>       int ret; >>>   @@ -1235,6 +1243,7 @@ int online_pages(unsigned long pfn, unsigned >>> long nr_pages, >>>                !IS_ALIGNED(pfn + nr_pages, PAGES_PER_SECTION))) >>>           return -EINVAL; >>>   +    new_contiguous_state = zone_contig_state_after_growing(zone, >>> pfn, nr_pages); >>>         /* associate pfn range with the zone */ >>>       move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, >>> MIGRATE_MOVABLE, >>> @@ -1273,6 +1282,7 @@ int online_pages(unsigned long pfn, unsigned >>> long nr_pages, >>>       } >>>         online_pages_range(pfn, nr_pages); >>> +    set_zone_contiguous(zone, new_contiguous_state); >>>       adjust_present_page_count(pfn_to_page(pfn), group, nr_pages); >>>         if (node_arg.nid >= 0) >>> -- >>> 2.47.1 >>>