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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Date:   Thu, 12 Nov 2020 14:22:00 -0800
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Zi Yan <ziy@...dia.com>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>
CC:     "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 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".