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Thu, 22 Oct 2026 01:51:43 -0700 (PDT) Received: from [192.168.1.18] ([83.231.69.9]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1fd0f4427sm101767255e9.3.2026.10.22.01.51.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2026 01:51:43 -0700 (PDT) Message-ID: <5b17b4ae-0db0-4998-bbfa-51bbeefeb551@gmail.com> Date: Thu, 22 Oct 2026 10:51:42 +0200 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/5] mm: hugetlb: avoid recursive CMA allocation during migration To: Qi Zheng , 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 References: <35120f1e65b135ebc7885a85bb39baab90882820.1792651104.git.zhengqi.arch@bytedance.com> Content-Language: en-US From: "Jose A. Perez de Azpillaga" In-Reply-To: <35120f1e65b135ebc7885a85bb39baab90882820.1792651104.git.zhengqi.arch@bytedance.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7BF35100008 X-Stat-Signature: 3wydnyjqdy8qcycfxg4zmboxwbdnd6b6 X-Spam-Status: No, score=-9.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1792659105-239176 X-HE-Meta: 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 QM+4d1vL 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/22/26 9:31 AM, Qi Zheng wrote: > From: Qi Zheng > > 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 LGTM so: Reviewed-by: Jose A. Perez de Azpillaga -- cheers, jose a. p-a