linux-kernel - Re: [PATCH 3/5] mm: add static huge zero folio

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Message-ID: <0e682d8e-12d8-4eac-b4ec-95444bf46ea8@redhat.com>
Date: Mon, 4 Aug 2025 19:08:11 +0200
From: David Hildenbrand <david@...hat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>,
 Ryan Roberts <ryan.roberts@....com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Borislav Petkov <bp@...en8.de>,
 Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
 Vlastimil Babka <vbabka@...e.cz>, Zi Yan <ziy@...dia.com>,
 Mike Rapoport <rppt@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>,
 Michal Hocko <mhocko@...e.com>, Andrew Morton <akpm@...ux-foundation.org>,
 Thomas Gleixner <tglx@...utronix.de>, Nico Pache <npache@...hat.com>,
 Dev Jain <dev.jain@....com>, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, willy@...radead.org, x86@...nel.org,
 linux-block@...r.kernel.org, Ritesh Harjani <ritesh.list@...il.com>,
 linux-fsdevel@...r.kernel.org, "Darrick J . Wong" <djwong@...nel.org>,
 mcgrof@...nel.org, gost.dev@...sung.com, hch@....de,
 Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH 3/5] mm: add static huge zero folio

> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index ff06dee213eb2..f65ba3e6f0824 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -866,9 +866,14 @@ static int __init thp_shrinker_init(void)
>    	huge_zero_folio_shrinker->scan_objects = shrink_huge_zero_folio_scan;
>    	shrinker_register(huge_zero_folio_shrinker);
>    
> -	deferred_split_shrinker->count_objects = deferred_split_count;
> -	deferred_split_shrinker->scan_objects = deferred_split_scan;
> -	shrinker_register(deferred_split_shrinker);
> +	if (IS_ENABLED(CONFIG_STATIC_HUGE_ZERO_FOLIO)) {
> +		if (!get_huge_zero_folio())
> +			pr_warn("Allocating static huge zero folio failed\n");
> +	} else {
> +		deferred_split_shrinker->count_objects = deferred_split_count;
> +		deferred_split_shrinker->scan_objects = deferred_split_scan;
> +		shrinker_register(deferred_split_shrinker);
> +	}

^ disabled the wrong shrinker, but you should get the idea

-- 
Cheers,

David / dhildenb