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, Vineet Gupta <vgupta@synopsys.com>
Subject: Re: [PATCH v4 00/12] mm/debug_vm_pgtable: Enhancements
Date: Mon, 2 Aug 2021 10:23:27 +0530 [thread overview]
Message-ID: <5ef150b0-60dc-3cf6-da6e-34fe0734ee2e@arm.com> (raw)
In-Reply-To: <05736d94-3bd1-3193-69b1-3c71aa22d0a7@redhat.com>
On 8/2/21 5:39 AM, Gavin Shan wrote:
> Hi Anshuman,
>
> On 7/29/21 5:14 PM, Anshuman Khandual wrote:
>> On 7/27/21 11:43 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 access 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
>>> =========
>>> v4:
>>> * Determine the page allocation method according to
>>> MAX_ORDER (Anshuman)
>>> * Move existing comments to init_args() (Anshuman)
>>> * Code refactoring as suggested by Anshuman (Anshuman)
>>> * Improved commit log and add comments for flush_dcache_page()
>>> in PATCH[v4 12/12] (Anshuman)
>>> * Address misc comments (Anshuman
>>
>> This series builds ok on all supported platforms but should also be tested
>> on them as well i.e s390, ppc, arc and riscv. I was able to do some tests
>> on arm64 and x86 platforms.
>>
>
> I had tests on the platforms except arc as it's not supported by QEMU yet.
> The test is pretty simple to boot the kernel and see if there is any warning
> raised from mm/debug_vm_pgtable. Everything looks good.
Sure, that should be enough.
>
> The test was done on v5, which will be posted pretty soon. Thanks again for
> your continuous review.
Please also do copy Vineet Gupta <vgupta@synopsys.com> for ARC in the next version.
- Anshuman
prev parent reply other threads:[~2021-08-02 4:52 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
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 [this message]
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