linux-kernel - Re: [PATCH v3 1/2] mm: huge_memory: disallow hugepages if the system-wide THP sysfs settings are disabled

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Message-ID: <a9f77007-78c1-4980-bd31-af5dff741f27@redhat.com>
Date: Mon, 23 Jun 2025 15:54:54 +0200
From: David Hildenbrand <david@...hat.com>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>, akpm@...ux-foundation.org,
 hughd@...gle.com
Cc: ziy@...dia.com, lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com,
 npache@...hat.com, ryan.roberts@....com, dev.jain@....com,
 baohua@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mm: huge_memory: disallow hugepages if the
 system-wide THP sysfs settings are disabled


> diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c
> index 4341ce6b3b38..85bfff53dba6 100644
> --- a/tools/testing/selftests/mm/khugepaged.c
> +++ b/tools/testing/selftests/mm/khugepaged.c
> @@ -501,11 +501,7 @@ static void __madvise_collapse(const char *msg, char *p, int nr_hpages,
>   
>   	printf("%s...", msg);
>   
> -	/*
> -	 * Prevent khugepaged interference and tests that MADV_COLLAPSE
> -	 * ignores /sys/kernel/mm/transparent_hugepage/enabled
> -	 */
> -	settings.thp_enabled = THP_NEVER;
> +	settings.thp_enabled = THP_ALWAYS;


Would MADVISE mode also work here? If we don't set MADV_HUGEPAGE, then 
khugepaged should be excluded, correct?


-- 
Cheers,

David / dhildenb