From: Yeoreum Yun <yeoreum.yun@arm.com>
To: Zi Yan <ziy@nvidia.com>
Cc: Yeoreum Yun <yeoreum.yun@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Liam R. Howlett" <liam@infradead.org>,
Nico Pache <nico.pache@linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Shuah Khan <shuah@kernel.org>,
Kevin Brodsky <kevin.brodsky@arm.com>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] kselftest: mm: prevent random failure of huge page split for khugepaged
Date: Thu, 20 Aug 2026 22:23:02 +0100 [thread overview]
Message-ID: <aodwNr_zgOn55z3W@e129823.arm.com> (raw)
In-Reply-To: <DKU173CETFYO.1RJA1CSOC5S99@nvidia.com>
On Thu, Aug 20, 2026 at 03:51:34PM -0400, Zi Yan wrote:
> On Thu Aug 20, 2026 at 3:40 PM EDT, Yeoreum Yun wrote:
> > There're some random failure for split_huge_page_test when khugepaged
> > collapses pages into pmd again which had split by the test.
> >
> > Prevent the khugepaged's collapses for split page by setting the
> > mapped pmd-huge-page with MADV_NOHUGEPAGE before split.
>
> Why not disable khugepaged using APIs from hugepage_setting.h?
Well, this also works with hugepage_save_settings() and write the
khugepaged/scan_sleep_millisecs with the maximum integer.
I don't have a strong opinion but since it seems more hackish way to
change scan_sllep_millisecs, I use madvise() with MADV_NOHUGEPATE.
Would it be better to change using APIs in hugepage_setting,h?
--
Sincerely,
Yeoreum Yun
next prev parent reply other threads:[~2026-08-20 21:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-20 19:40 [PATCH 0/2] kselftest: mm: fix some failure of split_huge_page_test Yeoreum Yun
2026-08-20 19:40 ` [PATCH 1/2] kselftest: mm: prevent random failure of huge page split for khugepaged Yeoreum Yun
2026-08-20 19:51 ` Zi Yan
2026-08-20 21:23 ` Yeoreum Yun [this message]
2026-08-20 23:37 ` Zi Yan
2026-08-20 23:55 ` Yeoreum Yun
2026-08-20 19:40 ` [PATCH 2/2] kselftest: mm: replace usage of /proc/self/smaps for check_huge_xxx() helper Yeoreum Yun
2026-08-20 19:55 ` Zi Yan
2026-08-20 21:26 ` Yeoreum Yun
2026-08-21 0:09 ` Zi Yan
2026-08-21 0:26 ` Yeoreum Yun
2026-08-21 1:19 ` Baolin Wang
2026-08-21 1:40 ` Zi Yan
2026-08-20 23:49 ` Yeoreum Yun
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