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Message-ID: <d373368a-52c9-30b8-5300-edaacad077ef@arm.com>
Date: Thu, 29 Jul 2021 11:21:45 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Gavin Shan <gshan@...hat.com>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, gerald.schaefer@...ux.ibm.com,
aneesh.kumar@...ux.ibm.com, christophe.leroy@...roup.eu,
cai@....pw, catalin.marinas@....com, will@...nel.org,
akpm@...ux-foundation.org, chuhu@...hat.com, shan.gavin@...il.com
Subject: Re: [PATCH v4 10/12] mm/debug_vm_pgtable: Use struct
pgtable_debug_args in PGD and P4D modifying tests
On 7/27/21 11:43 AM, Gavin Shan wrote:
> This uses struct pgtable_debug_args in PGD/P4D modifying tests. No
> allocated huge page is used in these tests. Besides, the unused
> variable @saved_p4dp and @saved_pudp are dropped.
>
> Signed-off-by: Gavin Shan <gshan@...hat.com>
> ---
> mm/debug_vm_pgtable.c | 86 +++++++++++++++++++------------------------
> 1 file changed, 38 insertions(+), 48 deletions(-)
>
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index 863871e70268..0611b5f31e89 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -518,27 +518,26 @@ static void __init pud_populate_tests(struct pgtable_debug_args *args) { }
> #endif /* PAGETABLE_PUD_FOLDED */
>
> #ifndef __PAGETABLE_P4D_FOLDED
> -static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp)
> +static void __init p4d_clear_tests(struct pgtable_debug_args *args)
> {
> - p4d_t p4d = READ_ONCE(*p4dp);
> + p4d_t p4d = READ_ONCE(*args->p4dp);
>
> - if (mm_pud_folded(mm))
> + if (mm_pud_folded(args->mm))
> return;
>
> pr_debug("Validating P4D clear\n");
> p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE);
> - WRITE_ONCE(*p4dp, p4d);
> - p4d_clear(p4dp);
> - p4d = READ_ONCE(*p4dp);
> + WRITE_ONCE(*args->p4dp, p4d);
> + p4d_clear(args->p4dp);
> + p4d = READ_ONCE(*args->p4dp);
> WARN_ON(!p4d_none(p4d));
> }
>
> -static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
> - pud_t *pudp)
> +static void __init p4d_populate_tests(struct pgtable_debug_args *args)
> {
> p4d_t p4d;
>
> - if (mm_pud_folded(mm))
> + if (mm_pud_folded(args->mm))
> return;
>
> pr_debug("Validating P4D populate\n");
> @@ -546,34 +545,33 @@ static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
> * This entry points to next level page table page.
> * Hence this must not qualify as p4d_bad().
> */
> - pud_clear(pudp);
> - p4d_clear(p4dp);
> - p4d_populate(mm, p4dp, pudp);
> - p4d = READ_ONCE(*p4dp);
> + pud_clear(args->pudp);
> + p4d_clear(args->p4dp);
> + p4d_populate(args->mm, args->p4dp, args->start_pudp);
> + p4d = READ_ONCE(*args->p4dp);
> WARN_ON(p4d_bad(p4d));
> }
>
> -static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp)
> +static void __init pgd_clear_tests(struct pgtable_debug_args *args)
> {
> - pgd_t pgd = READ_ONCE(*pgdp);
> + pgd_t pgd = READ_ONCE(*(args->pgdp));
>
> - if (mm_p4d_folded(mm))
> + if (mm_p4d_folded(args->mm))
> return;
>
> pr_debug("Validating PGD clear\n");
> pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE);
> - WRITE_ONCE(*pgdp, pgd);
> - pgd_clear(pgdp);
> - pgd = READ_ONCE(*pgdp);
> + WRITE_ONCE(*args->pgdp, pgd);
> + pgd_clear(args->pgdp);
> + pgd = READ_ONCE(*args->pgdp);
> WARN_ON(!pgd_none(pgd));
> }
>
> -static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
> - p4d_t *p4dp)
> +static void __init pgd_populate_tests(struct pgtable_debug_args *args)
> {
> pgd_t pgd;
>
> - if (mm_p4d_folded(mm))
> + if (mm_p4d_folded(args->mm))
> return;
>
> pr_debug("Validating PGD populate\n");
> @@ -581,23 +579,17 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
> * This entry points to next level page table page.
> * Hence this must not qualify as pgd_bad().
> */
> - p4d_clear(p4dp);
> - pgd_clear(pgdp);
> - pgd_populate(mm, pgdp, p4dp);
> - pgd = READ_ONCE(*pgdp);
> + p4d_clear(args->p4dp);
> + pgd_clear(args->pgdp);
> + pgd_populate(args->mm, args->pgdp, args->start_p4dp);
> + pgd = READ_ONCE(*args->pgdp);
> WARN_ON(pgd_bad(pgd));
> }
> #else /* !__PAGETABLE_P4D_FOLDED */
> -static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { }
> -static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { }
> -static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
> - pud_t *pudp)
> -{
> -}
> -static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
> - p4d_t *p4dp)
> -{
> -}
> +static void __init p4d_clear_tests(struct pgtable_debug_args *args) { }
> +static void __init pgd_clear_tests(struct pgtable_debug_args *args) { }
> +static void __init p4d_populate_tests(struct pgtable_debug_args *args) { }
> +static void __init pgd_populate_tests(struct pgtable_debug_args *args) { }
> #endif /* PAGETABLE_P4D_FOLDED */
>
> static void __init pte_clear_tests(struct pgtable_debug_args *args)
> @@ -1212,8 +1204,8 @@ static int __init debug_vm_pgtable(void)
> struct vm_area_struct *vma;
> struct mm_struct *mm;
> pgd_t *pgdp;
> - p4d_t *p4dp, *saved_p4dp;
> - pud_t *pudp, *saved_pudp;
> + p4d_t *p4dp;
> + pud_t *pudp;
> pmd_t *pmdp, *saved_pmdp, pmd;
> pte_t *ptep;
> pgtable_t saved_ptep;
> @@ -1258,8 +1250,6 @@ static int __init debug_vm_pgtable(void)
> * page table pages.
> */
> pmd = READ_ONCE(*pmdp);
> - saved_p4dp = p4d_offset(pgdp, 0UL);
> - saved_pudp = pud_offset(p4dp, 0UL);
> saved_pmdp = pmd_offset(pudp, 0UL);
> saved_ptep = pmd_pgtable(pmd);
>
> @@ -1338,15 +1328,15 @@ static int __init debug_vm_pgtable(void)
> pud_populate_tests(&args);
> spin_unlock(ptl);
>
> - spin_lock(&mm->page_table_lock);
> - p4d_clear_tests(mm, p4dp);
> - pgd_clear_tests(mm, pgdp);
> - p4d_populate_tests(mm, p4dp, saved_pudp);
> - pgd_populate_tests(mm, pgdp, saved_p4dp);
> - spin_unlock(&mm->page_table_lock);
> + spin_lock(&(args.mm->page_table_lock));
> + p4d_clear_tests(&args);
> + pgd_clear_tests(&args);
> + p4d_populate_tests(&args);
> + pgd_populate_tests(&args);
> + spin_unlock(&(args.mm->page_table_lock));
>
> - p4d_free(mm, saved_p4dp);
> - pud_free(mm, saved_pudp);
> + p4d_free(mm, p4d_offset(pgdp, 0UL));
> + pud_free(mm, pud_offset(p4dp, 0UL));
> pmd_free(mm, saved_pmdp);
> pte_free(mm, saved_ptep);
>
>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
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