linux-kernel - Re: [RFC PATCH 1/6] mm: huge_memory: add new debugfs interface to trigger split huge page on any page range.

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Message-ID: <86C79569-B59D-43AD-84B3-AEE10E46EC9C@nvidia.com>
Date:   Thu, 12 Nov 2020 17:38:17 -0500
From:   Zi Yan <ziy@...dia.com>
To:     Ralph Campbell <rcampbell@...dia.com>
CC:     <linux-mm@...ck.org>, Matthew Wilcox <willy@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        Yang Shi <shy828301@...il.com>,
        "Michal Hocko" <mhocko@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>
Subject: Re: [RFC PATCH 1/6] mm: huge_memory: add new debugfs interface to
 trigger split huge page on any page range.

On 12 Nov 2020, at 17:22, Ralph Campbell wrote:

> On 11/11/20 12:40 PM, Zi Yan wrote:
>> From: Zi Yan <ziy@...dia.com>
>>
>> Huge pages in the process with the given pid and virtual address range
>> are split. It is used to test split huge page function. In addition,
>> a testing program is added to tools/testing/selftests/vm to utilize the
>> interface by splitting PMD THPs.
>>
>> Signed-off-by: Zi Yan <ziy@...dia.com>
>> ---
>>   mm/huge_memory.c                              |  98 +++++++++++
>>   mm/internal.h                                 |   1 +
>>   mm/migrate.c                                  |   2 +-
>>   tools/testing/selftests/vm/Makefile           |   1 +
>>   .../selftests/vm/split_huge_page_test.c       | 161 ++++++++++++++++++
>>   5 files changed, 262 insertions(+), 1 deletion(-)
>>   create mode 100644 tools/testing/selftests/vm/split_huge_page_test.c
>
> Don't forget to update ".gitignore" to include "split_huge_page_test".

Sure. Thanks for pointing this out.

—
Best Regards,
Yan Zi

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