From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Gavin Shan <gshan@redhat.com>, linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, gerald.schaefer@linux.ibm.com,
aneesh.kumar@linux.ibm.com, christophe.leroy@csgroup.eu,
cai@lca.pw, catalin.marinas@arm.com, will@kernel.org,
akpm@linux-foundation.org, chuhu@redhat.com,
shan.gavin@gmail.com
Subject: Re: [PATCH v4 06/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in migration and thp tests
Date: Wed, 28 Jul 2021 16:38:02 +0530 [thread overview]
Message-ID: <39de75d2-744a-9194-cbc2-14926b60e68e@arm.com> (raw)
In-Reply-To: <20210727061401.592616-7-gshan@redhat.com>
On 7/27/21 11:43 AM, Gavin Shan wrote:
> This uses struct pgtable_debug_args in the migration and thp test
> functions. It's notable that the pre-allocated page is used in
> swap_migration_tests() as set_pte_at() is used there.
>
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
> mm/debug_vm_pgtable.c | 28 ++++++++++++++--------------
> 1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index bc153cad9045..9136195efde3 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -845,7 +845,7 @@ static void __init pmd_swap_tests(struct pgtable_debug_args *args)
> static void __init pmd_swap_tests(struct pgtable_debug_args *args) { }
> #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
>
> -static void __init swap_migration_tests(void)
> +static void __init swap_migration_tests(struct pgtable_debug_args *args)
> {
> struct page *page;
> swp_entry_t swp;
> @@ -861,9 +861,10 @@ static void __init swap_migration_tests(void)
> * problematic. Lets allocate a dedicated page explicitly for this
> * purpose that will be freed subsequently.
> */
> - page = alloc_page(GFP_KERNEL);
> + page = (args->pte_pfn != ULONG_MAX) ?
> + pfn_to_page(args->pte_pfn) : NULL;
> if (!page) {
> - pr_err("page allocation failed\n");
> + pr_err("no page available\n");
> return;
> }
Please check for a valid page earlier in the function and return. Otherwise
this calls out the page unavailability (after starting the test), which is
inconsistent with all other functions like pxx_advanced_tests().
[ 1.051633] debug_vm_pgtable: [pte_swap_tests ]: Validating PTE swap
[ 1.052697] debug_vm_pgtable: [pmd_swap_tests ]: Validating PMD swap
[ 1.053765] debug_vm_pgtable: [swap_migration_tests ]: Validating swap migration <=====
[ 1.054900] debug_vm_pgtable: [swap_migration_tests ]: no page available <=====
Should do this just before pr_info("Validating swap migration\n").
......
page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL;
if (!page)
return;
.....
next prev parent reply other threads:[~2021-07-28 11:07 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 6:13 [PATCH v4 00/12] mm/debug_vm_pgtable: Enhancements Gavin Shan
2021-07-27 6:13 ` [PATCH v4 01/12] mm/debug_vm_pgtable: Introduce struct pgtable_debug_args Gavin Shan
2021-07-28 7:32 ` Anshuman Khandual
2021-07-28 7:38 ` Gavin Shan
2021-07-29 4:45 ` Anshuman Khandual
2021-07-29 9:40 ` Gavin Shan
2021-07-27 6:13 ` [PATCH v4 02/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in basic tests Gavin Shan
2021-07-29 4:53 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 03/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in leaf and savewrite tests Gavin Shan
2021-07-29 5:00 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 04/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in protnone and devmap tests Gavin Shan
2021-07-29 5:02 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 05/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in soft_dirty and swap tests Gavin Shan
2021-07-29 5:07 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 06/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in migration and thp tests Gavin Shan
2021-07-28 11:08 ` Anshuman Khandual [this message]
2021-07-28 23:54 ` Gavin Shan
2021-07-27 6:13 ` [PATCH v4 07/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PTE modifying tests Gavin Shan
2021-07-29 5:16 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 08/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PMD " Gavin Shan
2021-07-29 5:30 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 09/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PUD " Gavin Shan
2021-07-29 5:44 ` Anshuman Khandual
2021-07-27 6:13 ` [PATCH v4 10/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PGD and P4D " Gavin Shan
2021-07-29 5:51 ` Anshuman Khandual
2021-07-27 6:14 ` [PATCH v4 11/12] mm/debug_vm_pgtable: Remove unused code Gavin Shan
2021-07-29 5:59 ` Anshuman Khandual
2021-07-27 6:14 ` [PATCH v4 12/12] mm/debug_vm_pgtable: Fix corrupted page flag Gavin Shan
2021-07-28 7:53 ` Christophe Leroy
2021-07-28 10:05 ` Anshuman Khandual
2021-07-29 0:00 ` Gavin Shan
2021-07-29 6:05 ` Anshuman Khandual
2021-07-29 7:14 ` [PATCH v4 00/12] mm/debug_vm_pgtable: Enhancements Anshuman Khandual
2021-08-02 0:09 ` Gavin Shan
2021-08-02 4:53 ` Anshuman Khandual
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