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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
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 v2 10/19] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper
Date: Mon, 26 Oct 2020 22:51:05 +0800
Message-ID: <20201026145114.59424-11-songmuchun@bytedance.com> (raw)
In-Reply-To: <20201026145114.59424-1-songmuchun@bytedance.com>

The __free_huge_page_pmd_vmemmap and __remap_huge_page_pmd_vmemmap are
almost the same code. So introduce remap_free_huge_page_pmd_vmemmap
helper to simplify the code.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 mm/hugetlb.c | 98 +++++++++++++++++++++-------------------------------
 1 file changed, 39 insertions(+), 59 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index cea580058a16..bd0c4e7fd994 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1482,6 +1482,41 @@ static inline int freed_vmemmap_hpage_dec(struct page *page)
 	return atomic_dec_return_relaxed(&page->_mapcount) + 1;
 }
 
+typedef void (*remap_pte_fn)(struct page *reuse, pte_t *ptep,
+			     unsigned long start, unsigned int nr_pages,
+			     struct list_head *pages);
+
+static void remap_huge_page_pmd_vmemmap(struct hstate *h, pmd_t *pmd,
+					unsigned long addr,
+					struct list_head *pages,
+					remap_pte_fn remap_fn)
+{
+	unsigned long next;
+	unsigned long start = addr + RESERVE_VMEMMAP_SIZE;
+	unsigned long end = addr + nr_vmemmap_size(h);
+	struct page *reuse = NULL;
+
+	flush_cache_vunmap(start, end);
+
+	addr = start;
+	do {
+		unsigned int nr_pages;
+		pte_t *ptep;
+
+		ptep = pte_offset_kernel(pmd, addr);
+		if (!reuse) {
+			reuse = pte_page(ptep[-1]);
+			set_page_private(reuse, addr - PAGE_SIZE);
+		}
+
+		next = vmemmap_hpage_addr_end(addr, end);
+		nr_pages = (next - addr) >> PAGE_SHIFT;
+		remap_fn(reuse, ptep, addr, nr_pages, pages);
+	} while (pmd++, addr = next, addr != end);
+
+	flush_tlb_kernel_range(start, end);
+}
+
 static inline void free_vmemmap_page_list(struct list_head *list)
 {
 	struct page *page, *next;
@@ -1513,33 +1548,6 @@ static void __free_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep,
 	}
 }
 
-static void __free_huge_page_pmd_vmemmap(struct hstate *h, pmd_t *pmd,
-					 unsigned long addr,
-					 struct list_head *free_pages)
-{
-	unsigned long next;
-	unsigned long start = addr + RESERVE_VMEMMAP_NR * PAGE_SIZE;
-	unsigned long end = addr + nr_vmemmap_size(h);
-	struct page *reuse = NULL;
-
-	addr = start;
-	do {
-		unsigned int nr_pages;
-		pte_t *ptep;
-
-		ptep = pte_offset_kernel(pmd, addr);
-		if (!reuse)
-			reuse = pte_page(ptep[-1]);
-
-		next = vmemmap_hpage_addr_end(addr, end);
-		nr_pages = (next - addr) >> PAGE_SHIFT;
-		__free_huge_page_pte_vmemmap(reuse, ptep, addr, nr_pages,
-					     free_pages);
-	} while (pmd++, addr = next, addr != end);
-
-	flush_tlb_kernel_range(start, end);
-}
-
 static void split_vmemmap_pmd(pmd_t *pmd, pte_t *pte_p, unsigned long addr)
 {
 	struct mm_struct *mm = &init_mm;
@@ -1598,7 +1606,8 @@ static void free_huge_page_vmemmap(struct hstate *h, struct page *head)
 		split_vmemmap_huge_page(head, pmd);
 	}
 
-	__free_huge_page_pmd_vmemmap(h, pmd, (unsigned long)head, &free_pages);
+	remap_huge_page_pmd_vmemmap(h, pmd, (unsigned long)head, &free_pages,
+				    __free_huge_page_pte_vmemmap);
 	freed_vmemmap_hpage_inc(pmd_page(*pmd));
 	spin_unlock(ptl);
 
@@ -1638,35 +1647,6 @@ static void __remap_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep,
 	}
 }
 
-static void __remap_huge_page_pmd_vmemmap(struct hstate *h, pmd_t *pmd,
-					  unsigned long addr,
-					  struct list_head *remap_pages)
-{
-	unsigned long next;
-	unsigned long start = addr + RESERVE_VMEMMAP_NR * PAGE_SIZE;
-	unsigned long end = addr + nr_vmemmap_size(h);
-	struct page *reuse = NULL;
-
-	addr = start;
-	do {
-		unsigned int nr_pages;
-		pte_t *ptep;
-
-		ptep = pte_offset_kernel(pmd, addr);
-		if (!reuse) {
-			reuse = pte_page(ptep[-1]);
-			set_page_private(reuse, addr - PAGE_SIZE);
-		}
-
-		next = vmemmap_hpage_addr_end(addr, end);
-		nr_pages = (next - addr) >> PAGE_SHIFT;
-		__remap_huge_page_pte_vmemmap(reuse, ptep, addr, nr_pages,
-					      remap_pages);
-	} while (pmd++, addr = next, addr != end);
-
-	flush_tlb_kernel_range(start, end);
-}
-
 static inline void alloc_vmemmap_pages(struct hstate *h, struct list_head *list)
 {
 	int i;
@@ -1695,8 +1675,8 @@ static void alloc_huge_page_vmemmap(struct hstate *h, struct page *head)
 	ptl = vmemmap_pmd_lockptr(pmd);
 
 	spin_lock(ptl);
-	__remap_huge_page_pmd_vmemmap(h, pmd, (unsigned long)head,
-				      &remap_pages);
+	remap_huge_page_pmd_vmemmap(h, pmd, (unsigned long)head, &remap_pages,
+				    __remap_huge_page_pte_vmemmap);
 	if (!freed_vmemmap_hpage_dec(pmd_page(*pmd))) {
 		/*
 		 * Todo:
-- 
2.20.1


  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-26 14:50 [PATCH v2 00/19] Free some vmemmap pages of hugetlb page Muchun Song
2020-10-26 14:50 ` [PATCH v2 01/19] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2020-10-26 14:50 ` [PATCH v2 02/19] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-10-26 14:50 ` [PATCH v2 03/19] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-10-29 10:29   ` Oscar Salvador
2020-10-29 13:34     ` [External] " Muchun Song
2020-10-26 14:50 ` [PATCH v2 04/19] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-10-27 22:03   ` Mike Kravetz
2020-10-29 13:26   ` Oscar Salvador
2020-10-29 13:41     ` [External] " Muchun Song
2020-10-26 14:51 ` [PATCH v2 05/19] mm/hugetlb: Introduce pgtable allocation/freeing helpers Muchun Song
2020-10-28  0:32   ` Mike Kravetz
2020-10-28  7:26     ` [External] " Muchun Song
2020-10-28 23:42       ` Mike Kravetz
2020-11-05 13:23   ` Oscar Salvador
2020-11-05 16:08     ` [External] " Muchun Song
2020-11-06  9:46       ` Oscar Salvador
2020-11-06 16:43         ` Muchun Song
2020-10-26 14:51 ` [PATCH v2 06/19] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-10-26 14:51 ` [PATCH v2 07/19] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-10-26 16:01   ` Matthew Wilcox
2020-10-27  2:58     ` [External] " Muchun Song
2020-10-28 23:42   ` Mike Kravetz
2020-10-29  6:13     ` [External] " Muchun Song
2020-10-29 21:59       ` Mike Kravetz
2020-10-30  2:58         ` Muchun Song
2020-10-26 14:51 ` [PATCH v2 08/19] mm/hugetlb: Defer freeing of hugetlb pages Muchun Song
2020-10-26 14:51 ` [PATCH v2 09/19] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-10-26 14:51 ` Muchun Song [this message]
2020-10-26 14:51 ` [PATCH v2 11/19] mm/hugetlb: Use PG_slab to indicate split pmd Muchun Song
2020-10-26 14:51 ` [PATCH v2 12/19] mm/hugetlb: Support freeing vmemmap pages of gigantic page Muchun Song
2020-10-26 14:51 ` [PATCH v2 13/19] mm/hugetlb: Add a BUILD_BUG_ON to check if struct page size is a power of two Muchun Song
2020-10-26 14:51 ` [PATCH v2 14/19] mm/hugetlb: Clear PageHWPoison on the non-error memory page Muchun Song
2020-10-26 14:51 ` [PATCH v2 15/19] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-10-26 14:51 ` [PATCH v2 16/19] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-10-26 14:51 ` [PATCH v2 17/19] mm/hugetlb: Merge pte to huge pmd only for gigantic page Muchun Song
2020-10-26 14:51 ` [PATCH v2 18/19] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-10-26 14:51 ` [PATCH v2 19/19] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
2020-10-26 15:53 ` [PATCH v2 00/19] Free some vmemmap pages of hugetlb page Matthew Wilcox
2020-10-27  2:54   ` [External] " Muchun Song
2020-10-30  9:14 ` Michal Hocko
2020-10-30 10:24   ` [External] " Muchun Song
2020-10-30 15:19     ` Michal Hocko

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