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Message-Id: <f7b2a6f6f5dfecbcac07fa3e187f10860c3a39ee.1655887440.git.baolin.wang@linux.alibaba.com>
Date: Wed, 22 Jun 2022 16:58:53 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org
Cc: rppt@...ux.ibm.com, willy@...radead.org,
baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 2/3] mm: Add PUD level pagetable account
Now the PUD level ptes are always protected by mm->page_table_lock,
which means no split pagetable lock needed. So the generic PUD level
pagetable pages allocation will not call pgtable_pte_page_ctor/dtor(),
that means we will miss to account PUD level pagetable pages.
Adding pagetable account by calling pgtable_set_and_inc() or
pgtable_clear_and_dec() when allocating or freeing PUD level pagetable
pages to help to get an accurate pagetable accounting.
Moreover this patch will also mark the PUD level pagetable with PG_table
flag, which will help to do sanity validation in unpoison_memory() and
get more accurate pagetable accounting by /proc/kpageflags interface.
Meanwhile converting the architectures with using generic PUD pagatable
allocation to add corresponding pgtable_set_and_inc() or pgtable_clear_and_dec()
to account PUD level pagetable.
Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
arch/arm64/include/asm/tlb.h | 5 ++++-
arch/loongarch/include/asm/pgalloc.h | 11 ++++++++---
arch/mips/include/asm/pgalloc.h | 11 ++++++++---
arch/s390/include/asm/tlb.h | 1 +
arch/x86/mm/pgtable.c | 5 ++++-
include/asm-generic/pgalloc.h | 12 ++++++++++--
6 files changed, 35 insertions(+), 10 deletions(-)
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
index c995d1f..47e0623 100644
--- a/arch/arm64/include/asm/tlb.h
+++ b/arch/arm64/include/asm/tlb.h
@@ -94,7 +94,10 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
unsigned long addr)
{
- tlb_remove_table(tlb, virt_to_page(pudp));
+ struct page *page = virt_to_page(pudp);
+
+ pgtable_clear_and_dec(page);
+ tlb_remove_table(tlb, page);
}
#endif
diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h
index b0a57b2..50a896f 100644
--- a/arch/loongarch/include/asm/pgalloc.h
+++ b/arch/loongarch/include/asm/pgalloc.h
@@ -89,10 +89,15 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
{
pud_t *pud;
+ struct page *pg;
+
+ pg = alloc_pages(GFP_KERNEL & ~__GFP_HIGHMEM, PUD_ORDER);
+ if (!pg)
+ return NULL;
- pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER);
- if (pud)
- pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
+ pgtable_set_and_inc(pg);
+ pud = (pud_t *)page_address(pg);
+ pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
return pud;
}
diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
index 867e9c3..0950f5f 100644
--- a/arch/mips/include/asm/pgalloc.h
+++ b/arch/mips/include/asm/pgalloc.h
@@ -89,11 +89,16 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
{
+ struct page *pg;
pud_t *pud;
- pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER);
- if (pud)
- pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
+ pg = alloc_pages(GFP_KERNEL & ~__GFP_HIGHMEM, PUD_ORDER);
+ if (!pg)
+ return NULL;
+
+ pgtable_set_and_inc(pg);
+ pud = (pud_t *)page_address(pg);
+ pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
return pud;
}
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index fe6407f..45f9541 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -125,6 +125,7 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
{
if (mm_pud_folded(tlb->mm))
return;
+ pgtable_clear_and_dec(virt_to_page(pud));
tlb->mm->context.flush_mm = 1;
tlb->freed_tables = 1;
tlb->cleared_p4ds = 1;
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index a932d77..a8ab3f9 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -76,8 +76,11 @@ void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
#if CONFIG_PGTABLE_LEVELS > 3
void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
{
+ struct page *page = virt_to_page(pud);
+
+ pgtable_clear_and_dec(page);
paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
- paravirt_tlb_remove_table(tlb, virt_to_page(pud));
+ paravirt_tlb_remove_table(tlb, page);
}
#if CONFIG_PGTABLE_LEVELS > 4
diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
index 977bea1..328a714 100644
--- a/include/asm-generic/pgalloc.h
+++ b/include/asm-generic/pgalloc.h
@@ -149,11 +149,16 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
static inline pud_t *__pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
+ struct page *page;
gfp_t gfp = GFP_PGTABLE_USER;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
- return (pud_t *)get_zeroed_page(gfp);
+ page = alloc_pages((gfp | __GFP_ZERO) & ~__GFP_HIGHMEM, 0);
+ if (!page)
+ return NULL;
+ pgtable_set_and_inc(page);
+ return (pud_t *)page_address(page);
}
#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
@@ -174,8 +179,11 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
static inline void __pud_free(struct mm_struct *mm, pud_t *pud)
{
+ struct page *page = virt_to_page(pud);
+
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
- free_page((unsigned long)pud);
+ pgtable_clear_and_dec(page);
+ __free_page(page);
}
#ifndef __HAVE_ARCH_PUD_FREE
--
1.8.3.1
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