From: "Jose A. Perez de Azpillaga" <azpijr@gmail.com>
To: Qi Zheng <qi.zheng@linux.dev>,
muchun.song@linux.dev, david@kernel.org, osalvador@suse.de,
akpm@linux-foundation.org
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Qi Zheng <zhengqi.arch@bytedance.com>
Subject: Re: [PATCH v2 4/5] mm: hugetlb: avoid recursive CMA allocation during migration
Date: Thu, 22 Oct 2026 10:51:42 +0200 [thread overview]
Message-ID: <5b17b4ae-0db0-4998-bbfa-51bbeefeb551@gmail.com> (raw)
In-Reply-To: <35120f1e65b135ebc7885a85bb39baab90882820.1792651104.git.zhengqi.arch@bytedance.com>
On 10/22/26 9:31 AM, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@bytedance.com>
>
> Contiguous allocation can migrate allocated HugeTLB folios or replace free
> HugeTLB folios while holding a CMA allocation mutex. Allocating a
> replacement through CMA would recurse into that allocation path once
> non-gigantic HugeTLB pages can use CMA.
>
> Pass allow_cma through the migration and fresh allocation helpers, and
> disable it for MR_CONTIG_RANGE and free folio replacement. Move the CMA
> attempt into the common allocation path, retaining the gigantic size
> restriction. Honor hugetlb_cma_only even when allow_cma is false.
>
> The existing gigantic migration restriction is unchanged.
>
> Assisted-by: LLM
> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
LGTM so:
Reviewed-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
--
cheers,
jose a. p-a
next prev parent reply other threads:[~2026-10-22 8:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-22 7:31 [PATCH v2 0/5] mm: hugetlb: add CMA support for PMD-sized pages Qi Zheng
2026-10-22 7:31 ` [PATCH v2 1/5] mm: hugetlb: add explicit page size to hugetlb_cma Qi Zheng
2026-10-22 9:50 ` Muchun Song
2026-10-22 7:31 ` [PATCH v2 2/5] mm: hugetlb: group CMA pool and reservation state Qi Zheng
2026-10-22 9:57 ` Muchun Song
2026-10-22 7:31 ` [PATCH v2 3/5] mm: hugetlb: track CMA reservations by pool Qi Zheng
2026-10-22 8:38 ` Jose A. Perez de Azpillaga
2026-10-22 11:21 ` Muchun Song
2026-10-23 6:35 ` Qi Zheng
2026-10-23 6:37 ` Muchun Song
2026-10-22 7:31 ` [PATCH v2 4/5] mm: hugetlb: avoid recursive CMA allocation during migration Qi Zheng
2026-10-22 8:51 ` Jose A. Perez de Azpillaga [this message]
2026-10-23 7:02 ` Muchun Song
2026-10-23 7:21 ` Qi Zheng
2026-10-22 7:31 ` [PATCH v2 5/5] mm: hugetlb: enable CMA allocation for PMD-sized pages Qi Zheng
2026-10-22 9:05 ` Jose A. Perez de Azpillaga
2026-10-22 9:38 ` Qi Zheng
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