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Message-Id: <20201124095259.58755-12-songmuchun@bytedance.com>
Date: Tue, 24 Nov 2020 17:52:54 +0800
From: Muchun Song <songmuchun@...edance.com>
To: corbet@....net, mike.kravetz@...cle.com, tglx@...utronix.de,
mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
paulmck@...nel.org, mchehab+huawei@...nel.org,
pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org,
oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de,
almasrymina@...gle.com, rientjes@...gle.com, willy@...radead.org,
osalvador@...e.de, mhocko@...e.com, song.bao.hua@...ilicon.com
Cc: duanxiongchun@...edance.com, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v6 11/16] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper
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@...edance.com>
---
mm/hugetlb_vmemmap.c | 87 +++++++++++++++++++++-------------------------------
1 file changed, 35 insertions(+), 52 deletions(-)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index d6a1b06c1322..509ca451e232 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -127,6 +127,10 @@
(__boundary - 1 < (end) - 1) ? __boundary : (end); \
})
+typedef void (*vmemmap_pte_remap_func_t)(struct page *reuse, pte_t *ptep,
+ unsigned long start, unsigned long end,
+ void *priv);
+
static inline unsigned int vmemmap_pages_per_hpage(struct hstate *h)
{
return free_vmemmap_pages_per_hpage(h) + RESERVE_VMEMMAP_NR;
@@ -162,21 +166,42 @@ static pmd_t *vmemmap_to_pmd(unsigned long page)
return pmd_offset(pud, page);
}
+static void remap_huge_page_pmd_vmemmap(pmd_t *pmd, unsigned long start,
+ unsigned long end,
+ vmemmap_pte_remap_func_t fn, void *priv)
+{
+ unsigned long next, addr = start;
+ struct page *reuse = NULL;
+
+ do {
+ pte_t *ptep;
+
+ ptep = pte_offset_kernel(pmd, addr);
+ if (!reuse)
+ reuse = pte_page(ptep[TAIL_PAGE_REUSE]);
+
+ next = vmemmap_hpage_addr_end(addr, end);
+ fn(reuse, ptep, addr, next, priv);
+ } while (pmd++, addr = next, addr != end);
+
+ flush_tlb_kernel_range(start, end);
+}
+
static void __remap_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep,
unsigned long start,
- unsigned long end,
- struct list_head *remap_pages)
+ unsigned long end, void *priv)
{
pgprot_t pgprot = PAGE_KERNEL;
void *from = page_to_virt(reuse);
unsigned long addr;
+ struct list_head *pages = priv;
for (addr = start; addr < end; addr += PAGE_SIZE) {
void *to;
struct page *page;
pte_t entry, old = *ptep;
- page = list_first_entry(remap_pages, struct page, lru);
+ page = list_first_entry(pages, struct page, lru);
list_del(&page->lru);
to = page_to_virt(page);
copy_page(to, from);
@@ -196,28 +221,6 @@ static void __remap_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep,
}
}
-static void __remap_huge_page_pmd_vmemmap(pmd_t *pmd, unsigned long start,
- unsigned long end,
- struct list_head *vmemmap_pages)
-{
- unsigned long next, addr = start;
- struct page *reuse = NULL;
-
- do {
- pte_t *ptep;
-
- ptep = pte_offset_kernel(pmd, addr);
- if (!reuse)
- reuse = pte_page(ptep[TAIL_PAGE_REUSE]);
-
- next = vmemmap_hpage_addr_end(addr, end);
- __remap_huge_page_pte_vmemmap(reuse, ptep, addr, next,
- vmemmap_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)
{
unsigned int nr = free_vmemmap_pages_per_hpage(h);
@@ -258,7 +261,8 @@ void alloc_huge_page_vmemmap(struct hstate *h, struct page *head)
start = vmemmap_addr + RESERVE_VMEMMAP_SIZE;
end = vmemmap_addr + vmemmap_pages_size_per_hpage(h);
- __remap_huge_page_pmd_vmemmap(pmd, start, end, &map_pages);
+ remap_huge_page_pmd_vmemmap(pmd, start, end,
+ __remap_huge_page_pte_vmemmap, &map_pages);
}
static inline void free_vmemmap_page_list(struct list_head *list)
@@ -273,13 +277,13 @@ static inline void free_vmemmap_page_list(struct list_head *list)
static void __free_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep,
unsigned long start,
- unsigned long end,
- struct list_head *free_pages)
+ unsigned long end, void *priv)
{
/* Make the tail pages are mapped read-only. */
pgprot_t pgprot = PAGE_KERNEL_RO;
pte_t entry = mk_pte(reuse, pgprot);
unsigned long addr;
+ struct list_head *pages = priv;
for (addr = start; addr < end; addr += PAGE_SIZE, ptep++) {
struct page *page;
@@ -287,34 +291,12 @@ static void __free_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep,
VM_WARN_ON(!pte_present(old));
page = pte_page(old);
- list_add(&page->lru, free_pages);
+ list_add(&page->lru, pages);
set_pte_at(&init_mm, addr, ptep, entry);
}
}
-static void __free_huge_page_pmd_vmemmap(pmd_t *pmd, unsigned long start,
- unsigned long end,
- struct list_head *vmemmap_pages)
-{
- unsigned long next, addr = start;
- struct page *reuse = NULL;
-
- do {
- pte_t *ptep;
-
- ptep = pte_offset_kernel(pmd, addr);
- if (!reuse)
- reuse = pte_page(ptep[TAIL_PAGE_REUSE]);
-
- next = vmemmap_hpage_addr_end(addr, end);
- __free_huge_page_pte_vmemmap(reuse, ptep, addr, next,
- vmemmap_pages);
- } while (pmd++, addr = next, addr != end);
-
- flush_tlb_kernel_range(start, end);
-}
-
void free_huge_page_vmemmap(struct hstate *h, struct page *head)
{
pmd_t *pmd;
@@ -330,7 +312,8 @@ void free_huge_page_vmemmap(struct hstate *h, struct page *head)
start = vmemmap_addr + RESERVE_VMEMMAP_SIZE;
end = vmemmap_addr + vmemmap_pages_size_per_hpage(h);
- __free_huge_page_pmd_vmemmap(pmd, start, end, &free_pages);
+ remap_huge_page_pmd_vmemmap(pmd, start, end,
+ __free_huge_page_pte_vmemmap, &free_pages);
free_vmemmap_page_list(&free_pages);
}
--
2.11.0
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