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,
vgupta@synopsys.com, akpm@linux-foundation.org, chuhu@redhat.com,
shan.gavin@gmail.com
Subject: Re: [PATCH v5 00/12] mm/debug_vm_pgtable: Enhancements
Date: Tue, 3 Aug 2021 12:20:24 +0530 [thread overview]
Message-ID: <b1e180b7-5ead-5423-9724-aaed0b539497@arm.com> (raw)
In-Reply-To: <20210802060419.1360913-1-gshan@redhat.com>
On 8/2/21 11:34 AM, Gavin Shan wrote:
> There are couple of issues with current implementations and this series
> tries to resolve the issues:
>
> (a) All needed information are scattered in variables, passed to various
> test functions. The code is organized in pretty much relaxed fashion.
>
> (b) The page isn't allocated from buddy during page table entry modifying
> tests. The page can be invalid, conflicting to the implementations
> of set_xxx_at() on ARM64. The target page is accessed so that the
> iCache can be flushed when execution permission is given on ARM64.
> Besides, the target page can be unmapped and accessing to it causes
> kernel crash.
>
> "struct pgtable_debug_args" is introduced to address issue (a). For issue
> (b), the used page is allocated from buddy in page table entry modifying
> tests. The corresponding tets will be skipped if we fail to allocate the
> (huge) page. For other test cases, the original page around to kernel
> symbol (@start_kernel) is still used.
>
> The patches are organized as below. PATCH[2-10] could be combined to one
> patch, but it will make the review harder:
>
> PATCH[1] introduces "struct pgtable_debug_args" as place holder of all
> needed information. With it, the old and new implementation
> can coexist.
> PATCH[2-10] uses "struct pgtable_debug_args" in various test functions.
> PATCH[11] removes the unused code for old implementation.
> PATCH[12] fixes the issue of corrupted page flag for ARM64
>
> Changelog
> =========
> v5:
> * Pick r-bs from Anshuman and rebase to 5.14.rc4 (Gavin)
> * Use args->start_p4dp to free p4d entries (Anshuman)
> * Introduce helper to allocate huge page in init_arg() (Anshuman)
> * Bail early if the allocated page doesn't exist in
> swap_migration_tests() and correct the comments (Anshuman)
> * Add fixes tag to PATCH[v4 12/12] (Christophe)
> * Address misc comments (Anshuman)
Apart from the proposed changes discussed for the first patch [PATCH 1/12],
this series overall looks good now. It clears build tests on all supported
platforms. I was able to test this on arm64 and x86 platforms with various
functional config combinations. It would be still great if others can take
a look as well.
- Anshuman
prev parent reply other threads:[~2021-08-03 6:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-02 6:04 [PATCH v5 00/12] mm/debug_vm_pgtable: Enhancements Gavin Shan
2021-08-02 6:04 ` [PATCH v5 01/12] mm/debug_vm_pgtable: Introduce struct pgtable_debug_args Gavin Shan
2021-08-03 4:42 ` Anshuman Khandual
2021-08-03 5:22 ` Gavin Shan
2021-08-02 6:04 ` [PATCH v5 02/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in basic tests Gavin Shan
2021-08-02 6:04 ` [PATCH v5 03/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in leaf and savewrite tests Gavin Shan
2021-08-02 6:04 ` [PATCH v5 04/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in protnone and devmap tests Gavin Shan
2021-08-02 6:04 ` [PATCH v5 05/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in soft_dirty and swap tests Gavin Shan
2021-08-02 6:04 ` [PATCH v5 06/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in migration and thp tests Gavin Shan
2021-08-02 6:04 ` [PATCH v5 07/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PTE modifying tests Gavin Shan
2021-08-02 6:04 ` [PATCH v5 08/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PMD " Gavin Shan
2021-08-02 6:04 ` [PATCH v5 09/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PUD " Gavin Shan
2021-08-02 6:04 ` [PATCH v5 10/12] mm/debug_vm_pgtable: Use struct pgtable_debug_args in PGD and P4D " Gavin Shan
2021-08-02 6:04 ` [PATCH v5 11/12] mm/debug_vm_pgtable: Remove unused code Gavin Shan
2021-08-02 6:04 ` [PATCH v5 12/12] mm/debug_vm_pgtable: Fix corrupted page flag Gavin Shan
2021-08-03 6:50 ` Anshuman Khandual [this message]
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