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([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4836cd7af87sm266525775e9.1.2026.02.15.13.56.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 15 Feb 2026 13:56:44 -0800 (PST) Message-ID: <386f4b36-0c53-4ad7-9f71-dff53345ec4f@gmail.com> Date: Sun, 15 Feb 2026 21:56:40 +0000 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] io_uring: delay sqarray static branch disablement To: Jens Axboe , io-uring@vger.kernel.org References: <8990bf99bc758c6e033e7a75ea5eb1834dd2f920.1771189395.git.asml.silence@gmail.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/15/26 21:48, Jens Axboe wrote: > On 2/15/26 2:29 PM, Pavel Begunkov wrote: >> io_key_has_sqarray static branch can be easily switched >> on/off by the user. Prevent abuse and defer for a bit when it's >> disabled. > > Can we get something in here for the reason for why the change > is being made? The commit message really doesn't explain any > of this. It appeared to be pretty self-explanatory, I can expand, but in short you can spam with while (1) { create_ring_with_sq_array(); kill_ring(); } and each iteration it'll be patching kernel code, and that can be very disruptive for the entire system depending on arch and how removal is synchronized. -- Pavel Begunkov