From patchwork Mon Jun 7 19:54:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12304575 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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 62F34C48BCF for ; Mon, 7 Jun 2021 19:55:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C33B611ED for ; Mon, 7 Jun 2021 19:55:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231577AbhFGT53 (ORCPT ); Mon, 7 Jun 2021 15:57:29 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:32417 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231582AbhFGT50 (ORCPT ); Mon, 7 Jun 2021 15:57:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623095734; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=c+4paKvG6GrNLwTw/zPYhocAQ6n+M9UGJdGP/M6kJg4=; b=OifDbZqfpf2VGwyEibLxmzkdmOHgmmH1nAROmaN2DH3SkZwWr+XTOgvFoK+xpAN2pF7VyC JUBIgs/5V39UwdN3t4MRB2/B1A/rnfOso/CkxRnZ45uuzj12bUnR3+CuPT2oFqdP9s5Jwa hty+CnDrNid0Rk0kwNvYdn6nHR6pRfA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-262-a3uJRSwFNpiiVXo8BS2GAA-1; Mon, 07 Jun 2021 15:55:33 -0400 X-MC-Unique: a3uJRSwFNpiiVXo8BS2GAA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4060210074C0; Mon, 7 Jun 2021 19:55:31 +0000 (UTC) Received: from t480s.redhat.com (ovpn-112-9.ams2.redhat.com [10.36.112.9]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0BE8310013C1; Mon, 7 Jun 2021 19:55:26 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , Andrew Morton , Vitaly Kuznetsov , "Michael S. Tsirkin" , Jason Wang , Marek Kedzierski , Hui Zhu , Pankaj Gupta , Wei Yang , Oscar Salvador , Michal Hocko , Dan Williams , Anshuman Khandual , Dave Hansen , Vlastimil Babka , Mike Rapoport , "Rafael J. Wysocki" , Len Brown , Pavel Tatashin , virtualization@lists.linux-foundation.org, linux-mm@kvack.org, linux-acpi@vger.kernel.org Subject: [PATCH v1 06/12] drivers/base/memory: "memory groups" to logically group memory blocks Date: Mon, 7 Jun 2021 21:54:24 +0200 Message-Id: <20210607195430.48228-7-david@redhat.com> In-Reply-To: <20210607195430.48228-1-david@redhat.com> References: <20210607195430.48228-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org In our "auto-movable" memory onlining policy, we want to make decisions across memory blocks of a single memory device. Examples of memory devices include ACPI memory devices (in the simplest case a single DIMM) a virtio-mem. For now, we don't have a connection between a single memory block device and the real memory device. Each memory device consists of 1..X memory block devices. Let's logically group memory blocks belonging to the same memory device in "memory groups". Memory groups can span multiple physical ranges and a memory group itself does not contain any information regarding physical ranges, only properties (e.g., "max_pages") necessary for improved memory onlining. Introduce two memory group types: 1) Static memory group: E.g., a single ACPI memory device, consisting of 1..X memory resources. A memory group consists of 1..Y memory blocks. The whole group is added/removed in one go. If any part cannot get offlined, the whole group cannot be removed. 2) Dynamic memory group: E.g., a single virtio-mem device. Memory is dynamically added/removed in a fixed granularity, called a "unit", consisting of 1..X memory blocks. A unit is added/removed in one go. If any part of a unit cannot get offlined, the whole unit cannot be removed. In case of 1) we usually want either all memory managed by ZONE_MOVABLE or none. In case of 2) we usually want to have as many units as possible managed by ZONE_MOVABLE. We want a single unit to be of the same type. For now, memory groups are an internal concept that is not exposed to user space; we might want to change that in the future, though. add_memory() users can specify a mgid instead of a nid when passing the MHP_NID_IS_MGID flag. Signed-off-by: David Hildenbrand --- drivers/base/memory.c | 102 +++++++++++++++++++++++++++++++-- include/linux/memory.h | 46 ++++++++++++++- include/linux/memory_hotplug.h | 6 +- mm/memory_hotplug.c | 11 +++- 4 files changed, 158 insertions(+), 7 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 427323620ce8..00c58a6632a6 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -82,6 +82,11 @@ static struct bus_type memory_subsys = { */ static DEFINE_XARRAY(memory_blocks); +/* + * Memory groups, indexed by memory group identification (mgid). + */ +static DEFINE_XARRAY_FLAGS(memory_groups, XA_FLAGS_ALLOC); + static BLOCKING_NOTIFIER_HEAD(memory_chain); int register_memory_notifier(struct notifier_block *nb) @@ -634,7 +639,8 @@ int register_memory(struct memory_block *memory) } static int init_memory_block(unsigned long block_id, unsigned long state, - unsigned long nr_vmemmap_pages) + unsigned long nr_vmemmap_pages, + struct memory_group *group) { struct memory_block *mem; int ret = 0; @@ -653,6 +659,11 @@ static int init_memory_block(unsigned long block_id, unsigned long state, mem->nid = NUMA_NO_NODE; mem->nr_vmemmap_pages = nr_vmemmap_pages; + if (group) { + mem->group = group; + refcount_inc(&group->refcount); + } + ret = register_memory(mem); return ret; @@ -671,7 +682,7 @@ 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, 0); + MEM_ONLINE, 0, NULL); } static void unregister_memory(struct memory_block *memory) @@ -681,6 +692,11 @@ static void unregister_memory(struct memory_block *memory) WARN_ON(xa_erase(&memory_blocks, memory->dev.id) == NULL); + if (memory->group) { + refcount_dec(&memory->group->refcount); + memory->group = NULL; + } + /* drop the ref. we got via find_memory_block() */ put_device(&memory->dev); device_unregister(&memory->dev); @@ -694,7 +710,8 @@ static void unregister_memory(struct memory_block *memory) * Called under device_hotplug_lock. */ int create_memory_block_devices(unsigned long start, unsigned long size, - unsigned long vmemmap_pages) + unsigned long vmemmap_pages, + struct memory_group *group) { 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)); @@ -707,7 +724,8 @@ 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, vmemmap_pages); + ret = init_memory_block(block_id, MEM_OFFLINE, vmemmap_pages, + group); if (ret) break; } @@ -891,3 +909,79 @@ int for_each_memory_block(void *arg, walk_memory_blocks_func_t func) return bus_for_each_dev(&memory_subsys, NULL, &cb_data, for_each_memory_block_cb); } + +static int register_memory_group(struct memory_group group) +{ + struct memory_group *new_group; + uint32_t mgid; + int ret; + + if (!node_possible(group.nid)) + return -EINVAL; + + new_group = kzalloc(sizeof(group), GFP_KERNEL); + if (!new_group) + return -ENOMEM; + *new_group = group; + refcount_set(&new_group->refcount, 1); + + ret = xa_alloc(&memory_groups, &mgid, new_group, xa_limit_31b, + GFP_KERNEL); + if (ret) + kfree(new_group); + return ret ? ret : mgid; +} + +int register_static_memory_group(int nid, unsigned long max_pages) +{ + struct memory_group group = { + .nid = nid, + .s = { + .max_pages = max_pages, + }, + }; + + if (!max_pages) + return -EINVAL; + return register_memory_group(group); +} +EXPORT_SYMBOL_GPL(register_static_memory_group); + +int register_dynamic_memory_group(int nid, unsigned long unit_pages) +{ + struct memory_group group = { + .nid = nid, + .is_dynamic = true, + .d = { + .unit_pages = unit_pages, + }, + }; + + if (!unit_pages || !is_power_of_2(unit_pages) || + unit_pages < PHYS_PFN(memory_block_size_bytes())) + return -EINVAL; + return register_memory_group(group); +} +EXPORT_SYMBOL_GPL(register_dynamic_memory_group); + +int unregister_memory_group(int mgid) +{ + struct memory_group *group; + + if (mgid < 0) + return -EINVAL; + + group = xa_load(&memory_groups, mgid); + if (!group || refcount_read(&group->refcount) > 1) + return -EINVAL; + + xa_erase(&memory_groups, mgid); + kfree(group); + return 0; +} +EXPORT_SYMBOL_GPL(unregister_memory_group); + +struct memory_group *get_memory_group(int mgid) +{ + return xa_load(&memory_groups, mgid); +} diff --git a/include/linux/memory.h b/include/linux/memory.h index 97e92e8b556a..6e20a6174fe5 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -23,6 +23,42 @@ #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) +struct memory_group { + /* Nid the whole group belongs to. */ + int nid; + /* References from memory blocks + 1. */ + refcount_t refcount; + /* + * Memory group type: static vs. dynamic. + * + * Static: All memory in the group belongs to a single unit, such as, + * a DIMM. All memory belonging to the group will be added in + * one go and removed in one go -- it's static. + * + * Dynamic: Memory within the group is added/removed dynamically in + * units of the specified granularity of at least one memory block. + */ + bool is_dynamic; + + union { + struct { + /* + * Maximum number of pages we'll have in this static + * memory group. + */ + unsigned long max_pages; + } s; + struct { + /* + * Unit in pages in which memory is added/removed in + * this dynamic memory group. This granularity defines + * the alignment of a unit in physical address space. + */ + unsigned long unit_pages; + } d; + }; +}; + struct memory_block { unsigned long start_section_nr; unsigned long state; /* serialized by the dev->lock */ @@ -34,6 +70,7 @@ struct memory_block { * lay at the beginning of the memory block. */ unsigned long nr_vmemmap_pages; + struct memory_group *group; /* group (if any) for this block */ }; int arch_get_memory_phys_device(unsigned long start_pfn); @@ -86,7 +123,8 @@ static inline int memory_notify(unsigned long val, void *v) 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, - unsigned long vmemmap_pages); + unsigned long vmemmap_pages, + struct memory_group *group); 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); @@ -95,6 +133,12 @@ typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *); extern int walk_memory_blocks(unsigned long start, unsigned long size, void *arg, walk_memory_blocks_func_t func); extern int for_each_memory_block(void *arg, walk_memory_blocks_func_t func); + +extern int register_static_memory_group(int nid, unsigned long max_pages); +extern int register_dynamic_memory_group(int nid, unsigned long unit_pages); +extern int unregister_memory_group(int mgid); +struct memory_group *get_memory_group(int mgid); + #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<nid; + } + if (!node_possible(nid)) { WARN(1, "node %d was absent from the node_possible_map\n", nid); return -EINVAL; @@ -1429,7 +1437,8 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) goto error; /* create memory block devices after memory was added */ - ret = create_memory_block_devices(start, size, mhp_altmap.alloc); + ret = create_memory_block_devices(start, size, mhp_altmap.alloc, + group); if (ret) { arch_remove_memory(start, size, NULL); goto error;