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 v6 11/16] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper
Date: Tue, 24 Nov 2020 17:52:54 +0800 [thread overview]
Message-ID: <20201124095259.58755-12-songmuchun@bytedance.com> (raw)
In-Reply-To: <20201124095259.58755-1-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_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
next prev parent reply other threads:[~2020-11-24 9:59 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 9:52 [PATCH v6 00/16] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-24 9:52 ` [PATCH v6 01/16] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2021-06-10 12:15 ` chengkaitao
2020-11-24 9:52 ` [PATCH v6 02/16] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-24 9:52 ` [PATCH v6 03/16] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-11-24 9:52 ` [PATCH v6 04/16] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-24 9:52 ` [PATCH v6 05/16] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-24 9:52 ` [PATCH v6 06/16] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Muchun Song
2020-11-24 9:52 ` [PATCH v6 07/16] x86/mm/64: Disable PMD page mapping of vmemmap Muchun Song
2020-11-24 10:24 ` Oscar Salvador
2020-11-24 10:31 ` Song Bao Hua (Barry Song)
2020-11-24 11:13 ` [External] " Muchun Song
2020-11-24 9:52 ` [PATCH v6 08/16] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-24 9:52 ` [PATCH v6 09/16] mm/hugetlb: Defer freeing of HugeTLB pages Muchun Song
2020-11-24 11:51 ` Michal Hocko
2020-11-24 12:45 ` [External] " Muchun Song
2020-11-24 13:14 ` Michal Hocko
2020-11-24 9:52 ` [PATCH v6 10/16] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-24 9:52 ` Muchun Song [this message]
2020-11-24 9:52 ` [PATCH v6 12/16] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-24 9:52 ` [PATCH v6 13/16] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-24 9:52 ` [PATCH v6 14/16] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-11-24 10:53 ` Song Bao Hua (Barry Song)
2020-11-24 11:07 ` [External] " Muchun Song
2020-11-24 9:52 ` [PATCH v6 15/16] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-24 9:52 ` [PATCH v6 16/16] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
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