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Mon, 15 Nov 2021 14:37:48 -0500 (EST) From: Zi Yan To: David Hildenbrand , linux-mm@kvack.org Subject: [RFC PATCH 1/3] mm: cma: alloc_contig_range: use pageblock_order as the single alignment. Date: Mon, 15 Nov 2021 14:37:22 -0500 Message-Id: <20211115193725.737539-2-zi.yan@sent.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211115193725.737539-1-zi.yan@sent.com> References: <20211115193725.737539-1-zi.yan@sent.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Zi Yan Cc: Robin Murphy , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Zi Yan , virtualization@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Marek Szyprowski Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Zi Yan Pages are grouped in unit of pageblock_order for mobility. cma and alloc_contig_range() uses pageblock for isolation and migration, so aligning PFNs to pageblock_order is necessary. But the PFNs used in cma and alloc_contig_range() were aligned to max(pageblock_order, MAX_ORDER-1). This makes no difference than aligning only to pageblock_order, since if pageblock_order > MAX_ORDER, the PFN is pageblock aligned, otherwise, the PFN is still pageblock aligned. Drop MAX_ORDER alignment requirement. When commit 47118af076f6 ("mm: mmzone: MIGRATE_CMA migration type added") introduced MIGRATE_CMA, __free_one_page() did not prevent merging freepages on isolate pagelbock and normal pageblock, thus it required max(pageblock_order, MAX_ORDER-1) alignment. __free_one_page() has changed and does prevent such merges. Signed-off-by: Zi Yan --- include/linux/mmzone.h | 5 +---- kernel/dma/contiguous.c | 2 +- mm/cma.c | 6 ++---- mm/page_alloc.c | 12 +++++------- 4 files changed, 9 insertions(+), 16 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 58e744b78c2c..6c61aa41a779 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -54,10 +54,7 @@ enum migratetype { * * The way to use it is to change migratetype of a range of * pageblocks to MIGRATE_CMA which can be done by - * __free_pageblock_cma() function. What is important though - * is that a range of pageblocks must be aligned to - * MAX_ORDER_NR_PAGES should biggest page be bigger than - * a single pageblock. + * __free_pageblock_cma() function. */ MIGRATE_CMA, #endif diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index 3d63d91cba5c..ac35b14b0786 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -399,7 +399,7 @@ static const struct reserved_mem_ops rmem_cma_ops = { static int __init rmem_cma_setup(struct reserved_mem *rmem) { - phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order); + phys_addr_t align = PAGE_SIZE << pageblock_order; phys_addr_t mask = align - 1; unsigned long node = rmem->fdt_node; bool default_cma = of_get_flat_dt_prop(node, "linux,cma-default", NULL); diff --git a/mm/cma.c b/mm/cma.c index bc9ca8f3c487..d171158bd418 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -180,8 +180,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, return -EINVAL; /* ensure minimal alignment required by mm core */ - alignment = PAGE_SIZE << - max_t(unsigned long, MAX_ORDER - 1, pageblock_order); + alignment = PAGE_SIZE << pageblock_order; /* alignment should be aligned with order_per_bit */ if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit)) @@ -268,8 +267,7 @@ int __init cma_declare_contiguous_nid(phys_addr_t base, * migratetype page by page allocator's buddy algorithm. In the case, * you couldn't get a contiguous memory, which is not what we want. */ - alignment = max(alignment, (phys_addr_t)PAGE_SIZE << - max_t(unsigned long, MAX_ORDER - 1, pageblock_order)); + alignment = max(alignment, (phys_addr_t)PAGE_SIZE << pageblock_order); if (fixed && base & (alignment - 1)) { ret = -EINVAL; pr_err("Region at %pa must be aligned to %pa bytes\n", diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c5952749ad40..5700f5502d59 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8922,14 +8922,12 @@ struct page *has_unmovable_pages(struct zone *zone, struct page *page, #ifdef CONFIG_CONTIG_ALLOC static unsigned long pfn_max_align_down(unsigned long pfn) { - return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, - pageblock_nr_pages) - 1); + return pfn & ~(pageblock_nr_pages - 1); } static unsigned long pfn_max_align_up(unsigned long pfn) { - return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, - pageblock_nr_pages)); + return ALIGN(pfn, pageblock_nr_pages); } #if defined(CONFIG_DYNAMIC_DEBUG) || \ @@ -9022,8 +9020,8 @@ static int __alloc_contig_migrate_range(struct compact_control *cc, * be either of the two. * @gfp_mask: GFP mask to use during compaction * - * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES - * aligned. The PFN range must belong to a single zone. + * The PFN range does not have to be pageblock aligned. The PFN range must + * belong to a single zone. * * The first thing this routine does is attempt to MIGRATE_ISOLATE all * pageblocks in the range. Once isolated, the pageblocks should not @@ -9099,7 +9097,7 @@ int alloc_contig_range(unsigned long start, unsigned long end, ret = 0; /* - * Pages from [start, end) are within a MAX_ORDER_NR_PAGES + * Pages from [start, end) are within a pageblock_nr_pages * aligned blocks that are marked as MIGRATE_ISOLATE. What's * more, all pages in [start, end) are free in page allocator. * What we are going to do is to allocate all pages from From patchwork Mon Nov 15 19:37:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zi Yan X-Patchwork-Id: 1555502 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=sent.com header.i=@sent.com header.a=rsa-sha256 header.s=fm2 header.b=BKmBzgqZ; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm1 header.b=kiuzRyPO; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; 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Mon, 15 Nov 2021 14:37:49 -0500 (EST) From: Zi Yan To: David Hildenbrand , linux-mm@kvack.org Subject: [RFC PATCH 2/3] drivers: virtio_mem: use pageblock size as the minimum virtio_mem size. Date: Mon, 15 Nov 2021 14:37:23 -0500 Message-Id: <20211115193725.737539-3-zi.yan@sent.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211115193725.737539-1-zi.yan@sent.com> References: <20211115193725.737539-1-zi.yan@sent.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Zi Yan Cc: Robin Murphy , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Zi Yan , virtualization@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Marek Szyprowski Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Zi Yan alloc_contig_range() now only needs to be aligned to pageblock_order, drop virtio_mem size requirement that it needs to be the max of pageblock_order and MAX_ORDER. Signed-off-by: Zi Yan --- drivers/virtio/virtio_mem.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 0da0af251c73..a0a0994b42e2 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -2436,15 +2436,13 @@ static int virtio_mem_init_hotplug(struct virtio_mem *vm) VIRTIO_MEM_DEFAULT_OFFLINE_THRESHOLD); /* - * We want subblocks to span at least MAX_ORDER_NR_PAGES and - * pageblock_nr_pages pages. This: + * We want subblocks to span at least pageblock_nr_pages pages. This: * - Simplifies our page onlining code (virtio_mem_online_page_cb) * and fake page onlining code (virtio_mem_fake_online). * - Is required for now for alloc_contig_range() to work reliably - * it doesn't properly handle smaller granularity on ZONE_NORMAL. */ - sb_size = max_t(uint64_t, MAX_ORDER_NR_PAGES, - pageblock_nr_pages) * PAGE_SIZE; + sb_size = pageblock_nr_pages * PAGE_SIZE; sb_size = max_t(uint64_t, vm->device_block_size, sb_size); if (sb_size < memory_block_size_bytes() && !force_bbm) { From patchwork Mon Nov 15 19:37:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zi Yan X-Patchwork-Id: 1555501 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=sent.com header.i=@sent.com header.a=rsa-sha256 header.s=fm2 header.b=xB60fto7; 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Mon, 15 Nov 2021 14:37:50 -0500 (EST) From: Zi Yan To: David Hildenbrand , linux-mm@kvack.org Subject: [RFC PATCH 3/3] arch: powerpc: adjust fadump alignment to be pageblock aligned. Date: Mon, 15 Nov 2021 14:37:24 -0500 Message-Id: <20211115193725.737539-4-zi.yan@sent.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211115193725.737539-1-zi.yan@sent.com> References: <20211115193725.737539-1-zi.yan@sent.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Zi Yan Cc: Robin Murphy , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Zi Yan , virtualization@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Marek Szyprowski Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Zi Yan CMA only requires pageblock alignment now. Change CMA alignment in fadump too. Signed-off-by: Zi Yan --- arch/powerpc/include/asm/fadump-internal.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/powerpc/include/asm/fadump-internal.h b/arch/powerpc/include/asm/fadump-internal.h index 8d61c8f3fec4..9198f20b6b68 100644 --- a/arch/powerpc/include/asm/fadump-internal.h +++ b/arch/powerpc/include/asm/fadump-internal.h @@ -20,9 +20,7 @@ #define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt) /* Alignment per CMA requirement. */ -#define FADUMP_CMA_ALIGNMENT (PAGE_SIZE << \ - max_t(unsigned long, MAX_ORDER - 1, \ - pageblock_order)) +#define FADUMP_CMA_ALIGNMENT (PAGE_SIZE << pageblock_order) /* FAD commands */ #define FADUMP_REGISTER 1