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Message-ID: <20230919064744.GE3303@kernel.org>
Date: Tue, 19 Sep 2023 09:47:44 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: akpm@...ux-foundation.org, will@...nel.org,
aneesh.kumar@...ux.ibm.com, npiggin@...il.com,
peterz@...radead.org, catalin.marinas@....com,
chenhuacai@...nel.org, tsbogend@...ha.franken.de,
dave.hansen@...ux.intel.com, luto@...nel.org, tglx@...utronix.de,
mingo@...hat.com, bp@...en8.de, arnd@...db.de, willy@...radead.org,
linux-arch@...r.kernel.org, linux-mm@...ck.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
loongarch@...ts.linux.dev, linux-mips@...r.kernel.org
Subject: Re: [PATCH] mm: add statistics for PUD level pagetable
On Mon, Sep 18, 2023 at 02:31:42PM +0800, Baolin Wang wrote:
> Recently, we found that cross-die access to pagetable pages on ARM64
> machines can cause performance fluctuations in our business. Currently,
> there are no PMU events available to track this situation on our ARM64
> machines, so an accurate pagetable accounting can help to analyze this
> issue, but now the PUD level pagetable accounting is missed.
>
> So introducing pagetable_pud_ctor/dtor() to help to get an accurate
> PUD pagetable accounting, as well as converting the architectures with
> using generic PUD pagatable allocation to add corresponding PUD 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().
>
> On my testing machine, I can see more pagetables statistics after the patch
> with page-types tool:
>
> Before patch:
> flags page-count MB symbolic-flags long-symbolic-flags
> 0x0000000004000000 27326 106 __________________________g_________________ pgtable
> After patch:
> 0x0000000004000000 27541 107 __________________________g_________________ pgtable
>
> Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
Acked-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---
> arch/arm64/include/asm/tlb.h | 5 ++++-
> arch/loongarch/include/asm/pgalloc.h | 1 +
> arch/mips/include/asm/pgalloc.h | 1 +
> arch/x86/mm/pgtable.c | 3 +++
> include/asm-generic/pgalloc.h | 7 ++++++-
> include/linux/mm.h | 16 ++++++++++++++++
> 6 files changed, 31 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
> index 2c29239d05c3..846c563689a8 100644
> --- a/arch/arm64/include/asm/tlb.h
> +++ b/arch/arm64/include/asm/tlb.h
> @@ -96,7 +96,10 @@ 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_ptdesc(tlb, virt_to_ptdesc(pudp));
> + struct ptdesc *ptdesc = virt_to_ptdesc(pudp);
> +
> + pagetable_pud_dtor(ptdesc);
> + tlb_remove_ptdesc(tlb, ptdesc);
> }
> #endif
>
> diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h
> index 79470f0b4f1d..4e2d6b7ca2ee 100644
> --- a/arch/loongarch/include/asm/pgalloc.h
> +++ b/arch/loongarch/include/asm/pgalloc.h
> @@ -84,6 +84,7 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
>
> if (!ptdesc)
> return NULL;
> + pagetable_pud_ctor(ptdesc);
> pud = ptdesc_address(ptdesc);
>
> pud_init(pud);
> diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
> index 40e40a7eb94a..f4440edcd8fe 100644
> --- a/arch/mips/include/asm/pgalloc.h
> +++ b/arch/mips/include/asm/pgalloc.h
> @@ -95,6 +95,7 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
>
> if (!ptdesc)
> return NULL;
> + pagetable_pud_ctor(ptdesc);
> pud = ptdesc_address(ptdesc);
>
> pud_init(pud);
> diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
> index 9deadf517f14..0cbc1b8e8e3d 100644
> --- a/arch/x86/mm/pgtable.c
> +++ b/arch/x86/mm/pgtable.c
> @@ -76,6 +76,9 @@ 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 ptdesc *ptdesc = virt_to_ptdesc(pud);
> +
> + pagetable_pud_dtor(ptdesc);
> paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
> paravirt_tlb_remove_table(tlb, virt_to_page(pud));
> }
> diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
> index c75d4a753849..879e5f8aa5e9 100644
> --- a/include/asm-generic/pgalloc.h
> +++ b/include/asm-generic/pgalloc.h
> @@ -169,6 +169,8 @@ static inline pud_t *__pud_alloc_one(struct mm_struct *mm, unsigned long addr)
> ptdesc = pagetable_alloc(gfp, 0);
> if (!ptdesc)
> return NULL;
> +
> + pagetable_pud_ctor(ptdesc);
> return ptdesc_address(ptdesc);
> }
>
> @@ -190,8 +192,11 @@ 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 ptdesc *ptdesc = virt_to_ptdesc(pud);
> +
> BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
> - pagetable_free(virt_to_ptdesc(pud));
> + pagetable_pud_dtor(ptdesc);
> + pagetable_free(ptdesc);
> }
>
> #ifndef __HAVE_ARCH_PUD_FREE
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 12335de50140..2232bfebb88a 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3049,6 +3049,22 @@ static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud)
> return ptl;
> }
>
> +static inline void pagetable_pud_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_pud_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);
>
> --
> 2.39.3
>
>
--
Sincerely yours,
Mike.
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