From patchwork Tue Dec 1 11:51:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11942739 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4E64C64E7A for ; Tue, 1 Dec 2020 11:52:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1007D2080A for ; Tue, 1 Dec 2020 11:52:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1007D2080A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 84E108D0003; Tue, 1 Dec 2020 06:52:12 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 824708D0001; Tue, 1 Dec 2020 06:52:12 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 738D98D0003; Tue, 1 Dec 2020 06:52:12 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0155.hostedemail.com [216.40.44.155]) by kanga.kvack.org (Postfix) with ESMTP id 5D8D48D0001 for ; Tue, 1 Dec 2020 06:52:12 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 2311E824999B for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-FDA: 77544550104.08.night12_51076e0273aa Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin08.hostedemail.com (Postfix) with ESMTP id 09F341819E624 for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-HE-Tag: night12_51076e0273aa X-Filterd-Recvd-Size: 6154 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Tue, 1 Dec 2020 11:52:11 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 69443ACC4; Tue, 1 Dec 2020 11:52:10 +0000 (UTC) From: Oscar Salvador To: david@redhat.com Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com, Oscar Salvador Subject: [RFC PATCH v3 1/4] mm,memory_hotplug: Add mhp_supports_memmap_on_memory Date: Tue, 1 Dec 2020 12:51:55 +0100 Message-Id: <20201201115158.22638-2-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20201201115158.22638-1-osalvador@suse.de> References: <20201201115158.22638-1-osalvador@suse.de> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: mhp_supports_memmap_on_memory is meant to be used by the caller prior to hot-adding memory in order to figure out whether it can enable MHP_MEMMAP_ON_MEMORY or not. Enabling MHP_MEMMAP_ON_MEMORY requires: - memmap_on_memory_enabled is set (by mhp_memmap_on_memory kernel boot option) - CONFIG_SPARSEMEM_VMEMMAP - architecture support for altmap - hot-added range spans a single memory block Note that mhp_memmap_on_memory kernel boot option will be added in a coming patch. At the moment, only three architectures support passing altmap when building the page tables: x86, POWERPC and ARM. Define an arch_support_memmap_on_memory function on those architectures that returns true, and define a __weak variant of it that will be used on the others. Signed-off-by: Oscar Salvador --- arch/arm64/mm/mmu.c | 5 +++++ arch/powerpc/mm/mem.c | 5 +++++ arch/x86/mm/init_64.c | 5 +++++ include/linux/memory_hotplug.h | 10 ++++++++++ mm/memory_hotplug.c | 24 ++++++++++++++++++++++++ 5 files changed, 49 insertions(+) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 30c6dd02e706..8a33ac97dcbb 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1454,6 +1454,11 @@ static bool inside_linear_region(u64 start, u64 size) (start + size - 1) <= __pa(PAGE_END - 1); } +bool arch_support_memmap_on_memory(void) +{ + return true; +} + int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) { diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 0694bdcce653..c5ef015c3189 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -181,6 +181,11 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size, __remove_pages(start_pfn, nr_pages, altmap); arch_remove_linear_mapping(start, size); } + +bool arch_support_memmap_on_memory(void) +{ + return true; +} #endif #ifndef CONFIG_NEED_MULTIPLE_NODES diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index b5a3fa4033d3..ffb9d87c77e8 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -860,6 +860,11 @@ int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, return ret; } +bool arch_support_memmap_on_memory(void) +{ + return true; +} + int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) { diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 15acce5ab106..a54310abee79 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -70,6 +70,14 @@ typedef int __bitwise mhp_t; */ #define MEMHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) +/* + * We want memmap (struct page array) to be self contained. + * To do so, we will use the beginning of the hot-added range to build + * the page tables for the memmap array that describes the entire range. + * Only selected architectures support it with SPARSE_VMEMMAP. + */ +#define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1)) + /* * Extended parameters for memory hotplug: * altmap: alternative allocator for memmap array (optional) @@ -129,6 +137,7 @@ extern int try_online_node(int nid); extern int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params); +extern bool arch_support_memmap_on_memory(void); extern u64 max_mem_size; extern int memhp_online_type_from_str(const char *str); @@ -361,6 +370,7 @@ extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum); extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, unsigned long nr_pages); +extern bool mhp_supports_memmap_on_memory(unsigned long size); extern int arch_create_linear_mapping(int nid, u64 start, u64 size, struct mhp_params *params); void arch_remove_linear_mapping(u64 start, u64 size); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a8cef4955907..e3c310225a60 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1011,6 +1011,20 @@ static int online_memory_block(struct memory_block *mem, void *arg) return device_online(&mem->dev); } +bool __weak arch_support_memmap_on_memory(void) +{ + return false; +} + +bool mhp_supports_memmap_on_memory(unsigned long size) +{ + if (!arch_support_memmap_on_memory() || + !IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP) || + size > memory_block_size_bytes()) + return false; + return true; +} + /* * NOTE: The caller must call lock_device_hotplug() to serialize hotplug * and online/offline operations (triggered e.g. by sysfs). @@ -1046,6 +1060,16 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) goto error; new_node = ret; + /* + * Return -EINVAL if caller specified MHP_MEMMAP_ON_MEMORY and we do + * not support it. + */ + if ((mhp_flags & MHP_MEMMAP_ON_MEMORY) && + !mhp_supports_memmap_on_memory(size)) { + ret = -EINVAL; + goto error; + } + /* call arch's memory hotadd */ ret = arch_add_memory(nid, start, size, ¶ms); if (ret < 0) From patchwork Tue Dec 1 11:51:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11942741 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C594C71155 for ; Tue, 1 Dec 2020 11:52:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B44642080A for ; Tue, 1 Dec 2020 11:52:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B44642080A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7AEC88D0006; Tue, 1 Dec 2020 06:52:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 762178D0005; Tue, 1 Dec 2020 06:52:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5D8DD8D0006; Tue, 1 Dec 2020 06:52:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0091.hostedemail.com [216.40.44.91]) by kanga.kvack.org (Postfix) with ESMTP id 437948D0001 for ; Tue, 1 Dec 2020 06:52:13 -0500 (EST) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id EC07F1F08 for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-FDA: 77544550104.23.milk19_2f0f5af273aa Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id C943A37604 for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-HE-Tag: milk19_2f0f5af273aa X-Filterd-Recvd-Size: 20251 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id EE465AD09; Tue, 1 Dec 2020 11:52:10 +0000 (UTC) From: Oscar Salvador To: david@redhat.com Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com, Oscar Salvador Subject: [RFC PATCH v3 2/4] mm,memory_hotplug: Allocate memmap from the added memory range Date: Tue, 1 Dec 2020 12:51:56 +0100 Message-Id: <20201201115158.22638-3-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20201201115158.22638-1-osalvador@suse.de> References: <20201201115158.22638-1-osalvador@suse.de> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Physical memory hotadd has to allocate a memmap (struct page array) for the newly added memory section. Currently, alloc_pages_node() is used for those allocations. This has some disadvantages: a) an existing memory is consumed for that purpose (eg: ~2MB per 128MB memory section on x86_64) b) if the whole node is movable then we have off-node struct pages which has performance drawbacks. c) It might be there are no PMD_ALIGNED chunks so memmap array gets populated with base pages. This can be improved when CONFIG_SPARSEMEM_VMEMMAP is enabled. Vmemap page tables can map arbitrary memory. That means that we can simply use the beginning of each memory section and map struct pages there. struct pages which back the allocated space then just need to be treated carefully. Implementation wise we will reuse vmem_altmap infrastructure to override the default allocator used by __populate_section_memmap. Part of the implementation also relies on memory_block structure gaining a new field which specifies the number of vmemmap_pages at the beginning. This comes in handy as in {online,offline}_pages, all the isolation and migration is being one on (buddy_start_pfn, end_pfn] range, being buddy_start_pfn = start_pfn + nr_vmemmap_pages. In this way, we have: (start_pfn, buddy_start_pfn - 1] = Initialized and PageReserved (buddy_start_pfn, end_pfn] = Initialized and sent to buddy Hot-remove: If the range was using memmap on memory (aka vmemmap pages), we construct an altmap structure so free_hugepage_table does the right thing and calls vmem_altmap_free instead of free_pagetable. Signed-off-by: Oscar Salvador --- drivers/base/memory.c | 21 +++++--- include/linux/memory.h | 7 ++- include/linux/memory_hotplug.h | 12 +++-- include/linux/memremap.h | 2 +- mm/memory_hotplug.c | 94 ++++++++++++++++++++++++++-------- mm/page_alloc.c | 4 +- 6 files changed, 105 insertions(+), 35 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 00a2f7191357..ed68fe267837 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -175,7 +175,7 @@ int memory_notify(unsigned long val, void *v) */ static int memory_block_action(unsigned long start_section_nr, unsigned long action, - int online_type, int nid) + int online_type, int nid, unsigned long nr_vmemmap_pages) { unsigned long start_pfn; unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; @@ -185,10 +185,11 @@ memory_block_action(unsigned long start_section_nr, unsigned long action, switch (action) { case MEM_ONLINE: - ret = online_pages(start_pfn, nr_pages, online_type, nid); + ret = online_pages(start_pfn, nr_pages, nr_vmemmap_pages, + online_type, nid); break; case MEM_OFFLINE: - ret = offline_pages(start_pfn, nr_pages); + ret = offline_pages(start_pfn, nr_pages, nr_vmemmap_pages); break; default: WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " @@ -211,7 +212,7 @@ static int memory_block_change_state(struct memory_block *mem, mem->state = MEM_GOING_OFFLINE; ret = memory_block_action(mem->start_section_nr, to_state, - mem->online_type, mem->nid); + mem->online_type, mem->nid, mem->nr_vmemmap_pages); mem->state = ret ? from_state_req : to_state; @@ -571,7 +572,8 @@ int register_memory(struct memory_block *memory) return ret; } -static int init_memory_block(unsigned long block_id, unsigned long state) +static int init_memory_block(unsigned long block_id, unsigned long state, + unsigned long nr_vmemmap_pages) { struct memory_block *mem; unsigned long start_pfn; @@ -591,6 +593,7 @@ static int init_memory_block(unsigned long block_id, unsigned long state) start_pfn = section_nr_to_pfn(mem->start_section_nr); mem->phys_device = arch_get_memory_phys_device(start_pfn); mem->nid = NUMA_NO_NODE; + mem->nr_vmemmap_pages = nr_vmemmap_pages; ret = register_memory(mem); @@ -610,7 +613,7 @@ static int add_memory_block(unsigned long base_section_nr) if (section_count == 0) return 0; return init_memory_block(memory_block_id(base_section_nr), - MEM_ONLINE); + MEM_ONLINE, 0); } static void unregister_memory(struct memory_block *memory) @@ -632,7 +635,8 @@ static void unregister_memory(struct memory_block *memory) * * Called under device_hotplug_lock. */ -int create_memory_block_devices(unsigned long start, unsigned long size) +int create_memory_block_devices(unsigned long start, unsigned long size, + unsigned long vmemmap_pages) { const unsigned long start_block_id = pfn_to_block_id(PFN_DOWN(start)); unsigned long end_block_id = pfn_to_block_id(PFN_DOWN(start + size)); @@ -645,9 +649,10 @@ int create_memory_block_devices(unsigned long start, unsigned long size) return -EINVAL; for (block_id = start_block_id; block_id != end_block_id; block_id++) { - ret = init_memory_block(block_id, MEM_OFFLINE); + ret = init_memory_block(block_id, MEM_OFFLINE, vmemmap_pages); if (ret) break; + vmemmap_pages = 0; } if (ret) { end_block_id = block_id; diff --git a/include/linux/memory.h b/include/linux/memory.h index 439a89e758d8..b910d2aea879 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -30,6 +30,11 @@ struct memory_block { int phys_device; /* to which fru does this belong? */ struct device dev; int nid; /* NID for this memory block */ + unsigned long nr_vmemmap_pages; /* + * Number of vmemmap pages. These pages + * lay at the beginning of the memory + * block. + */ }; int arch_get_memory_phys_device(unsigned long start_pfn); @@ -81,7 +86,7 @@ static inline int memory_notify(unsigned long val, void *v) #else extern int register_memory_notifier(struct notifier_block *nb); extern void unregister_memory_notifier(struct notifier_block *nb); -int create_memory_block_devices(unsigned long start, unsigned long size); +int create_memory_block_devices(unsigned long start, unsigned long size, unsigned long vmemmap_pages); void remove_memory_block_devices(unsigned long start, unsigned long size); extern void memory_dev_init(void); extern int memory_notify(unsigned long val, void *v); diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index a54310abee79..b828ddf07682 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -121,11 +121,13 @@ extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); /* VM interface that may be used by firmware interface */ extern int online_pages(unsigned long pfn, unsigned long nr_pages, - int online_type, int nid); + unsigned long nr_vmemmap_pages, int online_type, + int nid); extern struct zone *test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn); extern void __offline_isolated_pages(unsigned long start_pfn, - unsigned long end_pfn); + unsigned long end_pfn, + unsigned long buddy_start_pfn); typedef void (*online_page_callback_t)(struct page *page, unsigned int order); @@ -321,7 +323,8 @@ static inline void pgdat_resize_init(struct pglist_data *pgdat) {} #ifdef CONFIG_MEMORY_HOTREMOVE extern void try_offline_node(int nid); -extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); +extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages, + unsigned long nr_vmemmap_pages); extern int remove_memory(int nid, u64 start, u64 size); extern void __remove_memory(int nid, u64 start, u64 size); extern int offline_and_remove_memory(int nid, u64 start, u64 size); @@ -329,7 +332,8 @@ extern int offline_and_remove_memory(int nid, u64 start, u64 size); #else static inline void try_offline_node(int nid) {} -static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) +static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages, + unsigned long nr_vmemmap_pages) { return -EINVAL; } diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 86c6c368ce9b..3de5d482ac1a 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -17,7 +17,7 @@ struct device; * @alloc: track pages consumed, private to vmemmap_populate() */ struct vmem_altmap { - const unsigned long base_pfn; + unsigned long base_pfn; const unsigned long end_pfn; const unsigned long reserve; unsigned long free; diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index e3c310225a60..4b4708512f82 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -606,10 +606,12 @@ void generic_online_page(struct page *page, unsigned int order) } EXPORT_SYMBOL_GPL(generic_online_page); -static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages) +static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages, + unsigned long buddy_start_pfn) { const unsigned long end_pfn = start_pfn + nr_pages; unsigned long pfn; + unsigned int order; /* * Online the pages in MAX_ORDER - 1 aligned chunks. The callback might @@ -617,8 +619,12 @@ static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages) * later). We account all pages as being online and belonging to this * zone ("present"). */ - for (pfn = start_pfn; pfn < end_pfn; pfn += MAX_ORDER_NR_PAGES) - (*online_page_callback)(pfn_to_page(pfn), MAX_ORDER - 1); + for (pfn = buddy_start_pfn; pfn < end_pfn; pfn += (1 << order)) { + order = MAX_ORDER - 1; + while (pfn & ((1 << order) - 1)) + order--; + (*online_page_callback)(pfn_to_page(pfn), order); + } /* mark all involved sections as online */ online_mem_sections(start_pfn, end_pfn); @@ -678,6 +684,7 @@ static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned lon pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; } + /* * Associate the pfn range with the given zone, initializing the memmaps * and resizing the pgdat/zone data to span the added pages. After this @@ -777,9 +784,9 @@ struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, } int __ref online_pages(unsigned long pfn, unsigned long nr_pages, - int online_type, int nid) + unsigned long nr_vmemmap_pages, int online_type, int nid) { - unsigned long flags; + unsigned long flags, buddy_start_pfn, buddy_nr_pages; struct zone *zone; int need_zonelists_rebuild = 0; int ret; @@ -790,11 +797,18 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, !IS_ALIGNED(pfn | nr_pages, PAGES_PER_SECTION))) return -EINVAL; + buddy_start_pfn = pfn + nr_vmemmap_pages; + buddy_nr_pages = nr_pages - nr_vmemmap_pages; + mem_hotplug_begin(); /* associate pfn range with the zone */ zone = zone_for_pfn_range(online_type, nid, pfn, nr_pages); - move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE); + if (nr_vmemmap_pages) + move_pfn_range_to_zone(zone, pfn, nr_vmemmap_pages, NULL, + MIGRATE_UNMOVABLE); + move_pfn_range_to_zone(zone, buddy_start_pfn, buddy_nr_pages, NULL, + MIGRATE_ISOLATE); arg.start_pfn = pfn; arg.nr_pages = nr_pages; @@ -810,7 +824,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, * onlining, such that undo_isolate_page_range() works correctly. */ spin_lock_irqsave(&zone->lock, flags); - zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages; + zone->nr_isolate_pageblock += buddy_nr_pages / pageblock_nr_pages; spin_unlock_irqrestore(&zone->lock, flags); /* @@ -823,7 +837,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, setup_zone_pageset(zone); } - online_pages_range(pfn, nr_pages); + online_pages_range(pfn, nr_pages, buddy_start_pfn); zone->present_pages += nr_pages; pgdat_resize_lock(zone->zone_pgdat, &flags); @@ -836,7 +850,9 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, zone_pcp_update(zone); /* Basic onlining is complete, allow allocation of onlined pages. */ - undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE); + undo_isolate_page_range(buddy_start_pfn, + buddy_start_pfn + buddy_nr_pages, + MIGRATE_MOVABLE); /* * Freshly onlined pages aren't shuffled (e.g., all pages are placed to @@ -1034,6 +1050,7 @@ bool mhp_supports_memmap_on_memory(unsigned long size) int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) { struct mhp_params params = { .pgprot = PAGE_KERNEL }; + struct vmem_altmap mhp_altmap = {}; u64 start, size; bool new_node = false; int ret; @@ -1070,13 +1087,22 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) goto error; } + /* + * Self hosted memmap array + */ + if (mhp_flags & MHP_MEMMAP_ON_MEMORY) { + mhp_altmap.free = size >> PAGE_SHIFT; + mhp_altmap.base_pfn = start >> PAGE_SHIFT; + params.altmap = &mhp_altmap; + } + /* call arch's memory hotadd */ ret = arch_add_memory(nid, start, size, ¶ms); if (ret < 0) goto error; /* create memory block devices after memory was added */ - ret = create_memory_block_devices(start, size); + ret = create_memory_block_devices(start, size, mhp_altmap.alloc); if (ret) { arch_remove_memory(nid, start, size, NULL); goto error; @@ -1472,10 +1498,11 @@ static int count_system_ram_pages_cb(unsigned long start_pfn, return 0; } -int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) +int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages, + unsigned long nr_vmemmap_pages) { const unsigned long end_pfn = start_pfn + nr_pages; - unsigned long pfn, system_ram_pages = 0; + unsigned long pfn, buddy_start_pfn, buddy_nr_pages, system_ram_pages = 0; unsigned long flags; struct zone *zone; struct memory_notify arg; @@ -1487,6 +1514,9 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) !IS_ALIGNED(start_pfn | nr_pages, PAGES_PER_SECTION))) return -EINVAL; + buddy_start_pfn = start_pfn + nr_vmemmap_pages; + buddy_nr_pages = nr_pages - nr_vmemmap_pages; + mem_hotplug_begin(); /* @@ -1522,7 +1552,7 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) zone_pcp_disable(zone); /* set above range as isolated */ - ret = start_isolate_page_range(start_pfn, end_pfn, + ret = start_isolate_page_range(buddy_start_pfn, end_pfn, MIGRATE_MOVABLE, MEMORY_OFFLINE | REPORT_FAILURE); if (ret) { @@ -1542,7 +1572,7 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) } do { - pfn = start_pfn; + pfn = buddy_start_pfn; do { if (signal_pending(current)) { ret = -EINTR; @@ -1573,18 +1603,18 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) * offlining actually in order to make hugetlbfs's object * counting consistent. */ - ret = dissolve_free_huge_pages(start_pfn, end_pfn); + ret = dissolve_free_huge_pages(buddy_start_pfn, end_pfn); if (ret) { reason = "failure to dissolve huge pages"; goto failed_removal_isolated; } - ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE); + ret = test_pages_isolated(buddy_start_pfn, end_pfn, MEMORY_OFFLINE); } while (ret); /* Mark all sections offline and remove free pages from the buddy. */ - __offline_isolated_pages(start_pfn, end_pfn); + __offline_isolated_pages(start_pfn, end_pfn, buddy_start_pfn); pr_info("Offlined Pages %ld\n", nr_pages); /* @@ -1593,13 +1623,13 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) * of isolated pageblocks, memory onlining will properly revert this. */ spin_lock_irqsave(&zone->lock, flags); - zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; + zone->nr_isolate_pageblock -= buddy_nr_pages / pageblock_nr_pages; spin_unlock_irqrestore(&zone->lock, flags); zone_pcp_enable(zone); /* removal success */ - adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages); + adjust_managed_page_count(pfn_to_page(start_pfn), -buddy_nr_pages); zone->present_pages -= nr_pages; pgdat_resize_lock(zone->zone_pgdat, &flags); @@ -1659,6 +1689,16 @@ static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) return 0; } +static int get_memblock_vmemmap_pages_cb(struct memory_block *mem, void *arg) +{ + unsigned long *nr_vmemmap_pages = (unsigned long *)arg; + int ret = !mem->nr_vmemmap_pages; + + if (!ret) + *nr_vmemmap_pages += mem->nr_vmemmap_pages; + return ret; +} + static int check_cpu_on_node(pg_data_t *pgdat) { int cpu; @@ -1733,6 +1773,9 @@ EXPORT_SYMBOL(try_offline_node); static int __ref try_remove_memory(int nid, u64 start, u64 size) { int rc = 0; + struct vmem_altmap mhp_altmap = {}; + struct vmem_altmap *altmap = NULL; + unsigned long nr_vmemmap_pages = 0; BUG_ON(check_hotplug_memory_range(start, size)); @@ -1745,6 +1788,17 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size) if (rc) return rc; + /* + * Prepare a vmem_altmap struct if we used it at hot-add, so + * remove_pmd_table->free_hugepage_table does the right thing. + */ + (void)walk_memory_blocks(start, size, &nr_vmemmap_pages, + get_memblock_vmemmap_pages_cb); + if (nr_vmemmap_pages) { + mhp_altmap.alloc = nr_vmemmap_pages; + altmap = &mhp_altmap; + } + /* remove memmap entry */ firmware_map_remove(start, start + size, "System RAM"); @@ -1756,7 +1810,7 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size) mem_hotplug_begin(); - arch_remove_memory(nid, start, size, NULL); + arch_remove_memory(nid, start, size, altmap); if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { memblock_free(start, size); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f91df593bf71..818fb0223c35 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8856,7 +8856,8 @@ void zone_pcp_reset(struct zone *zone) * All pages in the range must be in a single zone, must not contain holes, * must span full sections, and must be isolated before calling this function. */ -void __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) +void __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn, + unsigned long buddy_start_pfn) { unsigned long pfn = start_pfn; struct page *page; @@ -8867,6 +8868,7 @@ void __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) offline_mem_sections(pfn, end_pfn); zone = page_zone(pfn_to_page(pfn)); spin_lock_irqsave(&zone->lock, flags); + pfn = buddy_start_pfn; while (pfn < end_pfn) { page = pfn_to_page(pfn); /* From patchwork Tue Dec 1 11:51:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11942743 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A72A2C64E7B for ; Tue, 1 Dec 2020 11:52:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2402220770 for ; Tue, 1 Dec 2020 11:52:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2402220770 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9ED338D0001; Tue, 1 Dec 2020 06:52:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7FC468D0007; Tue, 1 Dec 2020 06:52:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 676378D0001; Tue, 1 Dec 2020 06:52:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0111.hostedemail.com [216.40.44.111]) by kanga.kvack.org (Postfix) with ESMTP id 4D4C28D0005 for ; Tue, 1 Dec 2020 06:52:13 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 0D76C8249980 for ; Tue, 1 Dec 2020 11:52:13 +0000 (UTC) X-FDA: 77544550146.04.sofa16_2a010bd273aa Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin04.hostedemail.com (Postfix) with ESMTP id E3E71800A330 for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-HE-Tag: sofa16_2a010bd273aa X-Filterd-Recvd-Size: 3307 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf17.hostedemail.com (Postfix) with ESMTP for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 715A8AD43; Tue, 1 Dec 2020 11:52:11 +0000 (UTC) From: Oscar Salvador To: david@redhat.com Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com, Oscar Salvador Subject: [RFC PATCH v3 3/4] mm,memory_hotplug: Enable MHP_MEMMAP_ON_MEMORY when supported Date: Tue, 1 Dec 2020 12:51:57 +0100 Message-Id: <20201201115158.22638-4-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20201201115158.22638-1-osalvador@suse.de> References: <20201201115158.22638-1-osalvador@suse.de> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Let the callers check whether they can use MHP_MEMMAP_ON_MEMORY by checking mhp_supports_memmap_on_memory(). Currently, we only support MHP_MEMMAP_ON_MEMORY in case CONFIG_SPARSEMEM_VMEMMAP is enabled, the architecture supports altmap, and the range to be added spans a single memory block. Signed-off-by: Oscar Salvador --- arch/powerpc/platforms/pseries/hotplug-memory.c | 5 ++++- drivers/acpi/acpi_memhotplug.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index 7efe6ec5d14a..3aba817e729e 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -612,6 +612,7 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb) { unsigned long block_sz; int nid, rc; + mhp_t mhp_flags = MHP_NONE; if (lmb->flags & DRCONF_MEM_ASSIGNED) return -EINVAL; @@ -629,8 +630,10 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb) if (nid < 0 || !node_possible(nid)) nid = first_online_node; + if (mhp_supports_memmap_on_memory(block_sz)) + mhp_flags |= MHP_MEMMAP_ON_MEMORY; /* Add the memory */ - rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_NONE); + rc = __add_memory(nid, lmb->base_addr, block_sz, mhp_flags); if (rc) { invalidate_lmb_associativity_index(lmb); return rc; diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index b02fd51e5589..1fe645ef0b6c 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -172,6 +172,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) int result, num_enabled = 0; struct acpi_memory_info *info; int node; + mhp_t mhp_flags = MHP_NONE; node = acpi_get_node(handle); /* @@ -194,8 +195,10 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) if (node < 0) node = memory_add_physaddr_to_nid(info->start_addr); + if (mhp_supports_memmap_on_memory(info->length)) + mhp_flags |= MHP_MEMMAP_ON_MEMORY; result = __add_memory(node, info->start_addr, info->length, - MHP_NONE); + mhp_flags); /* * If the memory block has been used by the kernel, add_memory() From patchwork Tue Dec 1 11:51:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11942745 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CAFBC64E7A for ; Tue, 1 Dec 2020 11:52:20 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1A35920770 for ; Tue, 1 Dec 2020 11:52:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1A35920770 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E412C8D0007; Tue, 1 Dec 2020 06:52:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DF3668D0005; Tue, 1 Dec 2020 06:52:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CBA238D0008; Tue, 1 Dec 2020 06:52:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0054.hostedemail.com [216.40.44.54]) by kanga.kvack.org (Postfix) with ESMTP id B25078D0005 for ; Tue, 1 Dec 2020 06:52:13 -0500 (EST) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 7568E362D for ; Tue, 1 Dec 2020 11:52:13 +0000 (UTC) X-FDA: 77544550146.26.basin66_150c5f4273aa Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id 535FC1804B668 for ; Tue, 1 Dec 2020 11:52:13 +0000 (UTC) X-HE-Tag: basin66_150c5f4273aa X-Filterd-Recvd-Size: 2623 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf37.hostedemail.com (Postfix) with ESMTP for ; Tue, 1 Dec 2020 11:52:12 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id E5CDEAD6D; Tue, 1 Dec 2020 11:52:11 +0000 (UTC) From: Oscar Salvador To: david@redhat.com Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com, Oscar Salvador Subject: [RFC PATCH v3 4/4] mm,memory_hotplug: Add mhp_memmap_on_memory boot option Date: Tue, 1 Dec 2020 12:51:58 +0100 Message-Id: <20201201115158.22638-5-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20201201115158.22638-1-osalvador@suse.de> References: <20201201115158.22638-1-osalvador@suse.de> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Self stored memmap leads to a sparse memory situation which is unsuitable for workloads that requires large contiguous memory chunks. Make this an opt-in which needs to be explicitly enabled. Signed-off-by: Oscar Salvador --- mm/memory_hotplug.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 4b4708512f82..858d6161e915 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -42,6 +42,8 @@ #include "internal.h" #include "shuffle.h" +static bool memmap_on_memory_enabled __read_mostly = false; + /* * online_page_callback contains pointer to current page onlining function. * Initially it is generic_online_page(). If it is required it could be @@ -1034,7 +1036,7 @@ bool __weak arch_support_memmap_on_memory(void) bool mhp_supports_memmap_on_memory(unsigned long size) { - if (!arch_support_memmap_on_memory() || + if (!memmap_on_memory_enabled || !arch_support_memmap_on_memory() || !IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP) || size > memory_block_size_bytes()) return false; @@ -1422,6 +1424,13 @@ static int __init cmdline_parse_movable_node(char *p) } early_param("movable_node", cmdline_parse_movable_node); +static int __init cmdline_parse_memmap_on_memory(char *p) +{ + memmap_on_memory_enabled = true; + return 0; +} +early_param("mhp_memmap_on_memory", cmdline_parse_memmap_on_memory); + /* check which state of node_states will be changed when offline memory */ static void node_states_check_changes_offline(unsigned long nr_pages, struct zone *zone, struct memory_notify *arg)