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Sat, 17 Oct 2026 11:41:10 -0700 (PDT) Received: from [192.168.1.18] ([83.231.69.9]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1df164777sm49895585e9.5.2026.10.17.11.41.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 17 Oct 2026 11:41:08 -0700 (PDT) Message-ID: Date: Sat, 17 Oct 2026 20:41:06 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/5] mm: hugetlb: track CMA reservations by page order To: Qi Zheng , muchun.song@linux.dev, osalvador@suse.de, david@kernel.org, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qi Zheng References: <57cd5cac5e2749cba24c502bcd9682ad8b9f2bcd.1792136742.git.zhengqi.arch@bytedance.com> Content-Language: en-US From: "Jose A. Perez de Azpillaga" In-Reply-To: <57cd5cac5e2749cba24c502bcd9682ad8b9f2bcd.1792136742.git.zhengqi.arch@bytedance.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 17C7C140005 X-Stat-Signature: f9kro96d84ouj3mcnoi1qi8146fzmks9 X-Rspam-User: X-HE-Tag: 1792262471-702773 X-HE-Meta: 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 c0mIBqyq Ql3NelgXJI1wdahbbc/PT1ffrCD2cS4Z+D3LoJu01KuzIIrzr/5PjhDh4dHEqmaQ4L6N76L+/inP3NJIzLzOH1yQc2G7ZS1sn2m1a40l+zXItHllO6Lh7k2T35TeClOTK7SbrwPkMlGebj9EJPHpN8ZA3+DlrSIBvA9TFeXoklLplS+qIPXL/Dnip/SRrVqNbzr7+KP8/u5JFM0/BigrLu4yuvN3hoW/bhFFQ+wTBOpQsIfulbgn4AEKcN1owUUHMq5GRy/XL2PZhdx7OIOM0U/5KL/fXvA4ySAbSVQAkbgrS6WjEFmrGiDPD7HQwsLM5+bbuQ6SIie749DFuJtw/DpbKbLPg9H8FPnh6NzgRooeZvu4p88KJGApSyJHCqlxjMsrJ2fPyIRZcY8B60T1IHSHUA6BrxV7/hClHiB30R4XkLpMsnlNzHWCpq12y0r21U0d2xA39Ka6HqVsZw15KfP86uQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/16/26 12:07 PM, Qi Zheng wrote: > From: Qi Zheng > > Prepare for a separate CMA pool for PMD-sized HugeTLB pages by organizing > CMA areas and reservation parameters into pools identified by page order. > > Select the corresponding pool for allocation, CMA-only checks and > boot-time allocation decisions. Release folios through the CMA area that > owns their physical memory, including after demotion. > > Record each pool's successfully reserved capacity. Remove > hugetlb_cma_validate_params(), since the per-pool CMA-only check already > handles missing or empty pools. > > Continue accepting only the architecture's existing CMA page size and > preserve the default pool's use by all gigantic sizes. PMD-sized pool > support will be added in a subsequent patch. > > Assisted-by: LLM > Signed-off-by: Qi Zheng [snip] > +static struct hugetlb_cma_pool hugetlb_cma[HUGE_MAX_HSTATE] __ro_after_init; > +static struct hugetlb_cma_config hugetlb_cma_config[HUGE_MAX_HSTATE] __initdata; > +static unsigned int hugetlb_cma_nr __ro_after_init; the commit message prepares for one more pool, the PMD one, and hugetlb_cma_pool() folds every gigantic order into the default pool. would a fixed pair work instead of an order-keyed array? -- cheers, jose a. p-a