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Mon, 10 Nov 2025 05:06:10 -0800 (PST) X-Google-Smtp-Source: AGHT+IHa1bZhWZYpIRiHXf08xUrmaK6WFN6PjAsFMQbeMPuCsS2qh4FZGf8Bcb7s0JX7DPe5Zs3MLQ== X-Received: by 2002:a05:600c:1f88:b0:471:d2f:7987 with SMTP id 5b1f17b1804b1-4777327e861mr50551785e9.26.1762779969827; Mon, 10 Nov 2025 05:06:09 -0800 (PST) Received: from gmonaco-thinkpadt14gen3.rmtit.csb ([185.107.56.30]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4776bccd35asm198789785e9.1.2025.11.10.05.06.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 05:06:09 -0800 (PST) Message-ID: Subject: Re: [PATCH v14 7/7] timers: Exclude isolated cpus from timer migration From: Gabriele Monaco To: linux-kernel@vger.kernel.org, Anna-Maria Behnsen , Frederic Weisbecker , Thomas Gleixner , Waiman Long Cc: "John B . Wyatt IV" , "John B . Wyatt IV" Date: Mon, 10 Nov 2025 14:06:08 +0100 In-Reply-To: <20251104104740.70512-8-gmonaco@redhat.com> References: <20251104104740.70512-1-gmonaco@redhat.com> <20251104104740.70512-8-gmonaco@redhat.com> Autocrypt: addr=gmonaco@redhat.com; prefer-encrypt=mutual; keydata=mDMEZuK5YxYJKwYBBAHaRw8BAQdAmJ3dM9Sz6/Hodu33Qrf8QH2bNeNbOikqYtxWFLVm0 1a0JEdhYnJpZWxlIE1vbmFjbyA8Z21vbmFjb0BrZXJuZWwub3JnPoiZBBMWCgBBFiEEysoR+AuB3R Zwp6j270psSVh4TfIFAmjKX2MCGwMFCQWjmoAFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgk Q70psSVh4TfIQuAD+JulczTN6l7oJjyroySU55Fbjdvo52xiYYlMjPG7dCTsBAMFI7dSL5zg98I+8 cXY1J7kyNsY6/dcipqBM4RMaxXsOtCRHYWJyaWVsZSBNb25hY28gPGdtb25hY29AcmVkaGF0LmNvb T6InAQTFgoARAIbAwUJBaOagAULCQgHAgIiAgYVCgkICwIEFgIDAQIeBwIXgBYhBMrKEfgLgd0WcK eo9u9KbElYeE3yBQJoymCyAhkBAAoJEO9KbElYeE3yjX4BAJ/ETNnlHn8OjZPT77xGmal9kbT1bC1 7DfrYVISWV2Y1AP9HdAMhWNAvtCtN2S1beYjNybuK6IzWYcFfeOV+OBWRDQ== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-11-04 at 11:47 +0100, Gabriele Monaco wrote: > The timer migration mechanism allows active CPUs to pull timers from > idle ones to improve the overall idle time. This is however undesired > when CPU intensive workloads run on isolated cores, as the algorithm > would move the timers from housekeeping to isolated cores, negatively > affecting the isolation. >=20 > Exclude isolated cores from the timer migration algorithm, extend the > concept of unavailable cores, currently used for offline ones, to > isolated ones: > * A core is unavailable if isolated or offline; > * A core is available if non isolated and online; >=20 > ... >=20 > +/* Enabled during late initcall */ > +DEFINE_STATIC_KEY_FALSE(tmigr_exclude_isolated); > + I forgot to mark this as static: +static DEFINE_STATIC_KEY_FALSE(tmigr_exclude_isolated); will send a new version after getting a review/comments. Frederic, Thomas, besides that, does this series look ready to you? Thanks, Gabriele