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Tue, 25 Aug 2026 10:52:55 -0700 (PDT) Message-ID: <29d8d38f-cf2c-4216-96fd-546254c48332@kernel.dk> Date: Tue, 25 Aug 2026 11:52:54 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] io_uring: keep memlock accounting while regions are mapped To: dejamarina@proton.me Cc: io-uring@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260816-io-uring-retained-mmap-accounting-v1-1-44e5eedd7ad3@proton.me> Content-Language: en-US From: Jens Axboe In-Reply-To: <20260816-io-uring-retained-mmap-accounting-v1-1-44e5eedd7ad3@proton.me> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/16/26 1:07 AM, Marina via B4 Relay wrote: > From: Marina > > io_uring unaccounts kernel-allocated SQ/CQ and SQE regions when resize > replaces them, even if existing VMAs still retain their pages. Repeating > mmap and resize can therefore retain memory beyond RLIMIT_MEMLOCK. > > Move each charge to a refcounted record owned by the active region and its > MMU or NOMMU mappings. Release it after both the region and final VMA are > gone. Keep direct accounting for user-provided regions, which cannot be > mapped through the io_uring file. > > Accounting stays region-granular, so a partial mapping retains the complete > region charge. Patch doesn't apply to the current tree at all. Please send an updated one, if needed. -- Jens Axboe