From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793562034; b=EqWf+V+ZSk0LWOl9Zy7KVbutBvZHlvCyR7qgNXikwOYhOUlxKRq4Gczqv1cSUbEzy/n7 qRISzhkLELME2JD3DU4Uv9+3L96GilpFr2dyatGpP/M7Z+PZU7Oz5GoiCAAYnQLQv1sCT r2FX9c5x6BhGMVllt075v47Ns+SidBoKnwwK6LMNu28vWHCBExMYtQjAx1BF40ODh7b6A j3AoZU6ojGjRHQx8dU37smXr+8+zqSCM9ZfAM7LHeFjG9Rvq03aif6MpncJmtahclc7UX oogYCJRMbOTADCR/3vjUxrN1nFAiBa2Y9/RZg4VST2khD0to/p81WoqgdOQLmPKoHvw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793562034; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=pdvFWsApKxmar2eiZLNV2znpzPqmxEHjQ0hK5c3ClXI=; b=zJV/el9LN4l9Z5Xnuk6+kHckBnQDE/IBmcJxvV6hUah8kdTTw/L4LJCDyeQ3enKNemAk /PTaXmiwomm4Uzy2EX4v0Ciu0sxNIarPGGWFeVroXrL3I2PKkwP2CHILnBBEqxvoIWyhl E+2GwW0I+V/VgiPcfmyjsXHxxL06yFlZdDsAquqhSIBgl07gmOURixWjwOsTGhAFKILYk dsfalB9gx4ZV5sh/c30pgHT91oemR7M0ApWADR7Zr2T3CoDqshkwWNwoARWOl2MzAKF30 ud1BO1tioU4wqGjnY7oS+KNduCIQo+mBHIMOXcGx02dyZslYUH3MOUfI3oQZbyzpmKg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=It0gp5ZS; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1E965606A324 for ; Sun, 1 Nov 2026 19:40:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=It0gp5ZS Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABE961F000C1; Sun, 1 Nov 2026 19:40:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793562034; bh=pdvFWsApKxmar2eiZLNV2znpzPqmxEHjQ0hK5c3ClXI=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=It0gp5ZSxFe/S1/CQK3cqzqjeYAXJBCqWwDPva4s7ZaveJueb876u1uKO4og0+9ak K2d6J0QNWY/oKgb2IxxXjiN/jMmzLy+peLRp++EVNYSO1Uh7QGe5shmGKkkV78XmIR aFz9Bhn9x8u46KSbBqyt6KvZrBt7MG3ROG7A1Cc/m5FATs0EAKPQlpA5UU1BwopcCn /p7VxWmG04QrfiChsOnumoVq06K6N/XzhVU/3xJHQZQgaGwJbX4dST5PCspc9yZkxd shdHDroH/oeX2UaRMt8YLphXnAiBCGSnjfEaprqm2vS6hbMygZ67rcEXJ2u2gQJK68 ZPOMuWM9YZrZQ== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH 6/6] cpu: Add per-CPU preferred sysfs control Reply-To: sashiko-reviews@lists.linux.dev To: "Yury Norov" Cc: linux-s390@vger.kernel.org, "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" In-Reply-To: <20261101192203.6979-7-ynorov@nvidia.com> References: <20261101192203.6979-1-ynorov@nvidia.com> <20261101192203.6979-7-ynorov@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Sun, 01 Nov 2026 19:40:33 +0000 X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > Expose a writable preferred attribute for each CPU so users can manually > select CPUs for scheduler placement. This allows users to select any > desired combination of preferred CPUs, except for selecting inactive > CPUs and deselecting the last preferred CPU. >=20 > The manual method doesn't imply any preference over automated governors. > If an automated module is loaded, it may override user preferences, and > vice versa. >=20 > Fair tasks whose allowed CPUs contain no preferred CPU can still run > on active non-preferred CPUs. Other scheduling classes are unaffected. > This creates an environment similar to isolcpus, except that the list of > isolated CPUs can't be changed at runtime. Tick suppression, RCU > offloading, and managed-IRQ avoidance are compatible with preferred CPUs, > but may require separate configuration. >=20 > Signed-off-by: Yury Norov Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261101192203.6979= -1-ynorov@nvidia.com?part=3D6