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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ja12-20020a170902efcc00b0016ce3d67e7csi4253197plb.387.2022.10.20.14.59.59; Thu, 20 Oct 2022 15:00:12 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=XzHIddvg; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230140AbiJTVzW (ORCPT + 99 others); Thu, 20 Oct 2022 17:55:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229616AbiJTVyx (ORCPT ); Thu, 20 Oct 2022 17:54:53 -0400 Received: from mail-qt1-x82e.google.com (mail-qt1-x82e.google.com [IPv6:2607:f8b0:4864:20::82e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D8FE88A39; Thu, 20 Oct 2022 14:54:44 -0700 (PDT) Received: by mail-qt1-x82e.google.com with SMTP id w3so520534qtv.9; Thu, 20 Oct 2022 14:54:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ON4FfF7RtuDZjsoHxYv/wuBnH0JKvImdT9/cPL7B4E0=; b=XzHIddvgjbn/DEGuAOcP7G4+LhPADOsmHOVPx+eK/tArDp0m1ApsQjdzDRhDWjBjze FV7WvmZ3Z1YIylkFLO79TwLXVHmmpJiiMr4LzhKu5IQtBXgM1BWHrk9NnmQRBxx2R9of wXxEz7cErjAV/icB62wzyIHImPD22fCv2VuRDuHHzJ/eLMTeuoQTBvURVuUU8IuP5i77 Wwvv2l7MRAVvir55myuZNw2HjXsQ/g4bjHDnSPw6oJ4iQFcDR+ET2mGaH38XxNKI72wk jfitbMd/w6o0N3l/Q9xIA/puo4psu3OFDqXj5GIeGkX9Szoh/jdbWQUtBPei4RUXXhmg xH0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ON4FfF7RtuDZjsoHxYv/wuBnH0JKvImdT9/cPL7B4E0=; b=stcW/4VLuSCjXZaKN9FggnIeIbGd8A41RaFtd1K3iG/03TUX4sLSYXgaCHavnskogR j/9yOUzt7Vc/DfXM2TkecqD7GNwqgPACy0EufNdvjcSQnuLDSqmUiV49lle2sMlBBq2R khU1+F5fVORb70CQ7QF2dyRw6uwI00LTY0rmGDhRw0xitw/lD6y/6TQn56AGxltmMR6w WYAdFQpMdeKXEtJzVnn/i15psZ+7oX584Qxz2rM5x05JvJ3NjSsS4ZNbb4aITcH9d/nU lnljXOB0fN0y8KFwjxgZQG4CXzU7WDUa5uCSaserL9ZfhOben9J59eNm/lKzgRIuzDiO 8m6g== X-Gm-Message-State: ACrzQf18D/m61/fSHZViAExdN81Gbc5+Om9gfmrcZOBZPbPpGUlbdvHl 3XhP5GKoFLaPpPo9z3K2t6A= X-Received: by 2002:ac8:7f89:0:b0:39c:e339:3076 with SMTP id z9-20020ac87f89000000b0039ce3393076mr13067224qtj.526.1666302882230; Thu, 20 Oct 2022 14:54:42 -0700 (PDT) Received: from stbirv-lnx-3.igp.broadcom.net ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id bj41-20020a05620a192900b006bb29d932e1sm8121067qkb.105.2022.10.20.14.54.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Oct 2022 14:54:41 -0700 (PDT) From: Doug Berger To: Andrew Morton Cc: Jonathan Corbet , Mike Rapoport , Borislav Petkov , "Paul E. McKenney" , Neeraj Upadhyay , Randy Dunlap , Damien Le Moal , Muchun Song , Vlastimil Babka , Johannes Weiner , Michal Hocko , KOSAKI Motohiro , Mel Gorman , Mike Kravetz , Florian Fainelli , David Hildenbrand , Oscar Salvador , Joonsoo Kim , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Doug Berger Subject: [PATCH v3 7/9] mm/dmb: Introduce Designated Movable Blocks Date: Thu, 20 Oct 2022 14:53:16 -0700 Message-Id: <20221020215318.4193269-8-opendmb@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221020215318.4193269-1-opendmb@gmail.com> References: <20221020215318.4193269-1-opendmb@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747245557627484321?= X-GMAIL-MSGID: =?utf-8?q?1747245557627484321?= Designated Movable Blocks are blocks of memory that are composed of one or more adjacent memblocks that have the MEMBLOCK_MOVABLE designation. These blocks must be reserved before receiving that designation and will be located in the ZONE_MOVABLE zone rather than any other zone that may span them. Signed-off-by: Doug Berger --- include/linux/dmb.h | 29 ++++++++++++++ mm/Kconfig | 12 ++++++ mm/Makefile | 1 + mm/dmb.c | 91 +++++++++++++++++++++++++++++++++++++++++++ mm/memblock.c | 6 ++- mm/page_alloc.c | 95 ++++++++++++++++++++++++++++++++++++++------- 6 files changed, 220 insertions(+), 14 deletions(-) create mode 100644 include/linux/dmb.h create mode 100644 mm/dmb.c diff --git a/include/linux/dmb.h b/include/linux/dmb.h new file mode 100644 index 000000000000..fa2976c0fa21 --- /dev/null +++ b/include/linux/dmb.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __DMB_H__ +#define __DMB_H__ + +#include + +/* + * the buddy -- especially pageblock merging and alloc_contig_range() + * -- can deal with only some pageblocks of a higher-order page being + * MIGRATE_MOVABLE, we can use pageblock_nr_pages. + */ +#define DMB_MIN_ALIGNMENT_PAGES pageblock_nr_pages +#define DMB_MIN_ALIGNMENT_BYTES (PAGE_SIZE * DMB_MIN_ALIGNMENT_PAGES) + +enum { + DMB_DISJOINT = 0, + DMB_INTERSECTS, + DMB_MIXED, +}; + +struct dmb; + +extern int dmb_intersects(unsigned long spfn, unsigned long epfn); + +extern int dmb_reserve(phys_addr_t base, phys_addr_t size, + struct dmb **res_dmb); +extern void dmb_init_region(struct memblock_region *region); + +#endif diff --git a/mm/Kconfig b/mm/Kconfig index 57e1d8c5b505..3a058b34e77e 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -868,6 +868,18 @@ config CMA_AREAS If unsure, leave the default value "7" in UMA and "19" in NUMA. +config DMB_COUNT + int "Maximum count of Designated Movable Blocks" + default 19 if NUMA + default 7 + help + Designated Movable Blocks are blocks of memory that can be used + by the page allocator exclusively for movable pages. They are + managed in ZONE_MOVABLE but may overlap with other zones. This + parameter sets the maximum number of DMBs in the system. + + If unsure, leave the default value "7" in UMA and "19" in NUMA. + config MEM_SOFT_DIRTY bool "Track memory changes" depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY && PROC_FS diff --git a/mm/Makefile b/mm/Makefile index 8e105e5b3e29..824be8fb11cd 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -67,6 +67,7 @@ obj-y += page-alloc.o obj-y += init-mm.o obj-y += memblock.o obj-y += $(memory-hotplug-y) +obj-y += dmb.o ifdef CONFIG_MMU obj-$(CONFIG_ADVISE_SYSCALLS) += madvise.o diff --git a/mm/dmb.c b/mm/dmb.c new file mode 100644 index 000000000000..f6c4e2662e0f --- /dev/null +++ b/mm/dmb.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Designated Movable Block + */ + +#define pr_fmt(fmt) "dmb: " fmt + +#include + +struct dmb { + unsigned long start_pfn; + unsigned long end_pfn; +}; + +static struct dmb dmb_areas[CONFIG_DMB_COUNT]; +static unsigned int dmb_area_count; + +int dmb_intersects(unsigned long spfn, unsigned long epfn) +{ + int i; + struct dmb *dmb; + + if (spfn >= epfn) + return DMB_DISJOINT; + + for (i = 0; i < dmb_area_count; i++) { + dmb = &dmb_areas[i]; + if (spfn >= dmb->end_pfn) + continue; + if (epfn <= dmb->start_pfn) + return DMB_DISJOINT; + if (spfn >= dmb->start_pfn && epfn <= dmb->end_pfn) + return DMB_INTERSECTS; + else + return DMB_MIXED; + } + + return DMB_DISJOINT; +} +EXPORT_SYMBOL(dmb_intersects); + +int __init dmb_reserve(phys_addr_t base, phys_addr_t size, + struct dmb **res_dmb) +{ + struct dmb *dmb; + + /* Sanity checks */ + if (!size || !memblock_is_region_reserved(base, size)) + return -EINVAL; + + /* ensure minimal alignment required by mm core */ + if (!IS_ALIGNED(base | size, DMB_MIN_ALIGNMENT_BYTES)) + return -EINVAL; + + if (dmb_area_count == ARRAY_SIZE(dmb_areas)) { + pr_warn("Not enough slots for DMB reserved regions!\n"); + return -ENOSPC; + } + + /* + * Each reserved area must be initialised later, when more kernel + * subsystems (like slab allocator) are available. + */ + dmb = &dmb_areas[dmb_area_count++]; + + dmb->start_pfn = PFN_DOWN(base); + dmb->end_pfn = PFN_DOWN(base + size); + if (res_dmb) + *res_dmb = dmb; + + memblock_mark_movable(base, size); + return 0; +} + +void __init dmb_init_region(struct memblock_region *region) +{ + unsigned long pfn; + int i; + + for (pfn = memblock_region_memory_base_pfn(region); + pfn < memblock_region_memory_end_pfn(region); + pfn += pageblock_nr_pages) { + struct page *page = pfn_to_page(pfn); + + for (i = 0; i < pageblock_nr_pages; i++) + set_page_zone(page + i, ZONE_MOVABLE); + + /* free reserved pageblocks to page allocator */ + init_reserved_pageblock(page); + } +} diff --git a/mm/memblock.c b/mm/memblock.c index 46a4deb07d92..2a957337bd8b 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -2090,13 +2091,16 @@ static void __init memmap_init_reserved_pages(void) for_each_reserved_mem_range(i, &start, &end) reserve_bootmem_region(start, end); - /* and also treat struct pages for the NOMAP regions as PageReserved */ for_each_mem_region(region) { + /* treat struct pages for the NOMAP regions as PageReserved */ if (memblock_is_nomap(region)) { start = region->base; end = start + region->size; reserve_bootmem_region(start, end); } + /* move Designated Movable Block pages to ZONE_MOVABLE */ + if (memblock_is_movable(region)) + dmb_init_region(region); } } diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d7a5a05ead4b..82cad751e0b8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -76,6 +76,7 @@ #include #include #include +#include #include #include #include @@ -434,6 +435,8 @@ static unsigned long required_kernelcore __initdata; static unsigned long required_kernelcore_percent __initdata; static unsigned long required_movablecore __initdata; static unsigned long required_movablecore_percent __initdata; +static unsigned long min_dmb_pfn[MAX_NUMNODES] __initdata; +static unsigned long max_dmb_pfn[MAX_NUMNODES] __initdata; static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata; bool mirrored_kernelcore __initdata_memblock; @@ -2171,7 +2174,7 @@ static int __init deferred_init_memmap(void *data) } zone_empty: /* Sanity check that the next zone really is unpopulated */ - WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); + WARN_ON(++zid < ZONE_MOVABLE && populated_zone(++zone)); pr_info("node %d deferred pages initialised in %ums\n", pgdat->node_id, jiffies_to_msecs(jiffies - start)); @@ -6978,6 +6981,10 @@ static void __init memmap_init_zone_range(struct zone *zone, unsigned long zone_end_pfn = zone_start_pfn + zone->spanned_pages; int nid = zone_to_nid(zone), zone_id = zone_idx(zone); + /* Skip overlap of ZONE_MOVABLE */ + if (zone_id == ZONE_MOVABLE && zone_start_pfn < *hole_pfn) + zone_start_pfn = *hole_pfn; + start_pfn = clamp(start_pfn, zone_start_pfn, zone_end_pfn); end_pfn = clamp(end_pfn, zone_start_pfn, zone_end_pfn); @@ -7438,6 +7445,12 @@ static unsigned long __init zone_spanned_pages_in_node(int nid, node_start_pfn, node_end_pfn, zone_start_pfn, zone_end_pfn); + if (zone_type == ZONE_MOVABLE && max_dmb_pfn[nid]) { + if (*zone_start_pfn == *zone_end_pfn) + *zone_end_pfn = max_dmb_pfn[nid]; + *zone_start_pfn = min(*zone_start_pfn, min_dmb_pfn[nid]); + } + /* Check that this node has pages within the zone's required range */ if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn) return 0; @@ -7506,12 +7519,21 @@ static unsigned long __init zone_absent_pages_in_node(int nid, &zone_start_pfn, &zone_end_pfn); nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); + if (zone_type == ZONE_MOVABLE && max_dmb_pfn[nid]) { + if (zone_start_pfn == zone_end_pfn) + zone_end_pfn = max_dmb_pfn[nid]; + else + zone_end_pfn = zone_movable_pfn[nid]; + zone_start_pfn = min(zone_start_pfn, min_dmb_pfn[nid]); + nr_absent += zone_end_pfn - zone_start_pfn; + } + /* * ZONE_MOVABLE handling. - * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages + * Treat pages to be ZONE_MOVABLE in other zones as absent pages * and vice versa. */ - if (mirrored_kernelcore && zone_movable_pfn[nid]) { + if (zone_movable_pfn[nid]) { unsigned long start_pfn, end_pfn; struct memblock_region *r; @@ -7521,6 +7543,19 @@ static unsigned long __init zone_absent_pages_in_node(int nid, end_pfn = clamp(memblock_region_memory_end_pfn(r), zone_start_pfn, zone_end_pfn); + if (memblock_is_movable(r)) { + if (zone_type != ZONE_MOVABLE) { + nr_absent += end_pfn - start_pfn; + continue; + } + + nr_absent -= end_pfn - start_pfn; + continue; + } + + if (!mirrored_kernelcore) + continue; + if (zone_type == ZONE_MOVABLE && memblock_is_mirror(r)) nr_absent += end_pfn - start_pfn; @@ -7540,18 +7575,27 @@ static void __init calculate_node_totalpages(struct pglist_data *pgdat, { unsigned long totalpages = 0; enum zone_type i; + int nid = pgdat->node_id; + + /* + * If Designated Movable Blocks are defined on this node, ensure that + * zone_movable_pfn is also defined for this node. + */ + if (max_dmb_pfn[nid] && !zone_movable_pfn[nid]) + zone_movable_pfn[nid] = min(node_end_pfn, + arch_zone_highest_possible_pfn[movable_zone]); for (i = 0; i < MAX_NR_ZONES; i++) { struct zone *zone = pgdat->node_zones + i; unsigned long zone_start_pfn, zone_end_pfn; unsigned long spanned, absent, size; - spanned = zone_spanned_pages_in_node(pgdat->node_id, i, + spanned = zone_spanned_pages_in_node(nid, i, node_start_pfn, node_end_pfn, &zone_start_pfn, &zone_end_pfn); - absent = zone_absent_pages_in_node(pgdat->node_id, i, + absent = zone_absent_pages_in_node(nid, i, node_start_pfn, node_end_pfn); @@ -8002,15 +8046,27 @@ unsigned long __init node_map_pfn_alignment(void) static unsigned long __init early_calculate_totalpages(void) { unsigned long totalpages = 0; - unsigned long start_pfn, end_pfn; - int i, nid; + struct memblock_region *r; - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { - unsigned long pages = end_pfn - start_pfn; + for_each_mem_region(r) { + unsigned long start_pfn, end_pfn, pages; + int nid; + + nid = memblock_get_region_node(r); + start_pfn = memblock_region_memory_base_pfn(r); + end_pfn = memblock_region_memory_end_pfn(r); - totalpages += pages; - if (pages) + pages = end_pfn - start_pfn; + if (pages) { + totalpages += pages; node_set_state(nid, N_MEMORY); + if (memblock_is_movable(r)) { + if (start_pfn < min_dmb_pfn[nid]) + min_dmb_pfn[nid] = start_pfn; + if (end_pfn > max_dmb_pfn[nid]) + max_dmb_pfn[nid] = end_pfn; + } + } } return totalpages; } @@ -8023,7 +8079,7 @@ static unsigned long __init early_calculate_totalpages(void) */ static void __init find_zone_movable_pfns_for_nodes(void) { - int i, nid; + int nid; unsigned long usable_startpfn; unsigned long kernelcore_node, kernelcore_remaining; /* save the state before borrow the nodemask */ @@ -8151,13 +8207,24 @@ static void __init find_zone_movable_pfns_for_nodes(void) kernelcore_remaining = kernelcore_node; /* Go through each range of PFNs within this node */ - for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { + for_each_mem_region(r) { unsigned long size_pages; + if (memblock_get_region_node(r) != nid) + continue; + + start_pfn = memblock_region_memory_base_pfn(r); + end_pfn = memblock_region_memory_end_pfn(r); start_pfn = max(start_pfn, zone_movable_pfn[nid]); if (start_pfn >= end_pfn) continue; + /* Skip over Designated Movable Blocks */ + if (memblock_is_movable(r)) { + zone_movable_pfn[nid] = end_pfn; + continue; + } + /* Account for what is only usable for kernelcore */ if (start_pfn < usable_startpfn) { unsigned long kernel_pages; @@ -8306,6 +8373,8 @@ void __init free_area_init(unsigned long *max_zone_pfn) } /* Find the PFNs that ZONE_MOVABLE begins at in each node */ + memset(min_dmb_pfn, 0xff, sizeof(min_dmb_pfn)); + memset(max_dmb_pfn, 0, sizeof(max_dmb_pfn)); memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); find_zone_movable_pfns_for_nodes();