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mm: pgtable: add statistics for P4D level page table

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Like other levels of page tables, add statistics for P4D level page table.

Link: https://lkml.kernel.org/r/d55fe3c286305aae84457da9e1066df99b3de125.1736317725.git.zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Originally-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Qi Zheng
2025-01-08 14:57:20 +08:00
committed by Andrew Morton
parent 98a7e47faa
commit 5fcf5fa612
4 changed files with 26 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/riscv/include/asm/pgalloc.h
View File

@@ -108,8 +108,12 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long addr)
{
if (pgtable_l5_enabled)
if (pgtable_l5_enabled) {
struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
pagetable_p4d_dtor(ptdesc);
riscv_tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
}
}
#endif /* __PAGETABLE_PMD_FOLDED */

3
arch/x86/mm/pgtable.c
View File

@@ -94,6 +94,9 @@ void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
#if CONFIG_PGTABLE_LEVELS > 4
void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
{
struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
pagetable_p4d_dtor(ptdesc);
paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
paravirt_tlb_remove_table(tlb, virt_to_page(p4d));
}

2
include/asm-generic/pgalloc.h
View File

@@ -230,6 +230,7 @@ static inline p4d_t *__p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long
if (!ptdesc)
return NULL;
pagetable_p4d_ctor(ptdesc);
return ptdesc_address(ptdesc);
}
#define __p4d_alloc_one(...) alloc_hooks(__p4d_alloc_one_noprof(__VA_ARGS__))
@@ -247,6 +248,7 @@ static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
pagetable_p4d_dtor(ptdesc);
pagetable_free(ptdesc);
}

16
include/linux/mm.h
View File

@@ -3175,6 +3175,22 @@ static inline void pagetable_pud_dtor(struct ptdesc *ptdesc)
lruvec_stat_sub_folio(folio, NR_PAGETABLE);
}
static inline void pagetable_p4d_ctor(struct ptdesc *ptdesc)
{
struct folio *folio = ptdesc_folio(ptdesc);
__folio_set_pgtable(folio);
lruvec_stat_add_folio(folio, NR_PAGETABLE);
}
static inline void pagetable_p4d_dtor(struct ptdesc *ptdesc)
{
struct folio *folio = ptdesc_folio(ptdesc);
__folio_clear_pgtable(folio);
lruvec_stat_sub_folio(folio, NR_PAGETABLE);
}
extern void __init pagecache_init(void);
extern void free_initmem(void);