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From: Muchun Song <songmuchun@bytedance.com>
To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
	dave.hansen@linux.intel.com, luto@kernel.org,
	peterz@infradead.org, viro@zeniv.linux.org.uk,
	akpm@linux-foundation.org, paulmck@kernel.org,
	mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com,
	rdunlap@infradead.org, oneukum@suse.com,
	anshuman.khandual@arm.com, jroedel@suse.de,
	almasrymina@google.com, rientjes@google.com, willy@infradead.org,
	osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com
Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org,
	Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH v5 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP
Date: Fri, 20 Nov 2020 14:43:07 +0800	[thread overview]
Message-ID: <20201120064325.34492-4-songmuchun@bytedance.com> (raw)
In-Reply-To: <20201120064325.34492-1-songmuchun@bytedance.com>

The purpose of introducing HUGETLB_PAGE_FREE_VMEMMAP is to configure
whether to enable the feature of freeing unused vmemmap associated
with HugeTLB pages. Now only support x86.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 arch/x86/mm/init_64.c |  2 +-
 fs/Kconfig            | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 0a45f062826e..0435bee2e172 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1225,7 +1225,7 @@ static struct kcore_list kcore_vsyscall;
 
 static void __init register_page_bootmem_info(void)
 {
-#ifdef CONFIG_NUMA
+#if defined(CONFIG_NUMA) || defined(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP)
 	int i;
 
 	for_each_online_node(i)
diff --git a/fs/Kconfig b/fs/Kconfig
index 976e8b9033c4..4961dd488444 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -245,6 +245,20 @@ config HUGETLBFS
 config HUGETLB_PAGE
 	def_bool HUGETLBFS
 
+config HUGETLB_PAGE_FREE_VMEMMAP
+	def_bool HUGETLB_PAGE
+	depends on X86
+	depends on SPARSEMEM_VMEMMAP
+	depends on HAVE_BOOTMEM_INFO_NODE
+	help
+	  When using HUGETLB_PAGE_FREE_VMEMMAP, the system can save up some
+	  memory from pre-allocated HugeTLB pages when they are not used.
+	  6 pages per 2MB HugeTLB page and 4094 per 1GB HugeTLB page.
+
+	  When the pages are going to be used or freed up, the vmemmap array
+	  representing that range needs to be remapped again and the pages
+	  we discarded earlier need to be rellocated again.
+
 config MEMFD_CREATE
 	def_bool TMPFS || HUGETLBFS
 
-- 
2.11.0


  parent reply	other threads:[~2020-11-20  6:47 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20  6:43 [PATCH v5 00/21] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-20  6:43 ` [PATCH v5 01/21] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2020-11-20  6:43 ` [PATCH v5 02/21] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-20  6:43 ` Muchun Song [this message]
2020-11-20  7:49   ` [PATCH v5 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Michal Hocko
2020-11-20  8:35     ` [External] " Muchun Song
2020-11-20  8:47       ` Michal Hocko
2020-11-20  8:53         ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 04/21] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-20  6:43 ` [PATCH v5 05/21] mm/hugetlb: Introduce pgtable allocation/freeing helpers Muchun Song
2020-11-20  6:43 ` [PATCH v5 06/21] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-20  6:43 ` [PATCH v5 07/21] mm/bootmem_info: Combine bootmem info and type into page->freelist Muchun Song
2020-11-20  6:43 ` [PATCH v5 08/21] mm/hugetlb: Initialize page table lock for vmemmap Muchun Song
2020-11-20  6:43 ` [PATCH v5 09/21] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-20  6:43 ` [PATCH v5 10/21] mm/hugetlb: Defer freeing of hugetlb pages Muchun Song
2020-11-20  6:43 ` [PATCH v5 11/21] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-20  8:11   ` Michal Hocko
2020-11-20  8:51     ` [External] " Muchun Song
2020-11-20  9:28       ` Michal Hocko
2020-11-20  9:37         ` Muchun Song
2020-11-20 11:10           ` Michal Hocko
2020-11-20 11:56             ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 12/21] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper Muchun Song
2020-11-20  6:43 ` [PATCH v5 13/21] mm/hugetlb: Use PG_slab to indicate split pmd Muchun Song
2020-11-20  8:16   ` Michal Hocko
2020-11-20  9:30     ` [External] " Muchun Song
2020-11-23  7:48       ` Michal Hocko
2020-11-23  8:01         ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 14/21] mm/hugetlb: Support freeing vmemmap pages of gigantic page Muchun Song
2020-11-20  6:43 ` [PATCH v5 15/21] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-20  8:19   ` Michal Hocko
2020-11-20 10:32     ` [External] " Muchun Song
2020-11-20  6:43 ` [PATCH v5 16/21] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-20  8:20   ` Michal Hocko
2020-11-20  6:43 ` [PATCH v5 17/21] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-11-20  8:22   ` Michal Hocko
2020-11-20 10:39     ` [External] " Muchun Song
2020-11-20  6:43 ` [PATCH v5 18/21] mm/hugetlb: Merge pte to huge pmd only for gigantic page Muchun Song
2020-11-20  8:23   ` Michal Hocko
2020-11-20 10:41     ` [External] " Muchun Song
2020-11-20  6:43 ` [PATCH v5 19/21] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-20  6:43 ` [PATCH v5 20/21] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
2020-11-20  6:43 ` [PATCH v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Muchun Song
2020-11-20  8:25   ` Michal Hocko
2020-11-20  9:15     ` David Hildenbrand
2020-11-22 13:30       ` Mike Rapoport
2020-11-22 19:00     ` Matthew Wilcox
2020-11-23  3:14       ` [External] " Muchun Song
2020-11-20  9:16   ` David Hildenbrand
2020-11-20 10:42     ` [External] " Muchun Song
2020-11-20  8:42 ` [PATCH v5 00/21] Free some vmemmap pages of hugetlb page Michal Hocko
2020-11-20  9:27   ` David Hildenbrand
2020-11-20  9:39     ` Michal Hocko
2020-11-20  9:43       ` David Hildenbrand
2020-11-20 17:45         ` Mike Kravetz
2020-11-20 18:00           ` David Hildenbrand
2020-11-22  7:29           ` [External] " Muchun Song
2020-11-23  7:38           ` Michal Hocko
2020-11-23 21:52             ` Mike Kravetz
2020-11-23 22:01               ` Matthew Wilcox
2020-11-20 12:40   ` [External] " Muchun Song
2020-11-20 13:11     ` Michal Hocko
2020-11-20 15:44       ` Muchun Song
2020-11-23  7:40         ` Michal Hocko
2020-11-23  8:53           ` Muchun Song
2020-11-23  9:43             ` Michal Hocko
2020-11-23 10:36               ` Muchun Song
2020-11-23 10:42                 ` Michal Hocko
2020-11-23 11:16                   ` Muchun Song
2020-11-23 11:32                     ` Michal Hocko
2020-11-23 12:07                       ` Muchun Song
2020-11-23 12:18                         ` Michal Hocko
2020-11-23 12:40                           ` Muchun Song
2020-11-23 12:48                             ` Michal Hocko
2020-11-23 12:45                   ` Matthew Wilcox
2020-11-23 13:05                     ` Muchun Song
2020-11-23 13:13                     ` Michal Hocko

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