From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9072E40F749 for ; Tue, 1 Sep 2026 14:52:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788274346; cv=none; b=XIldi7CDCFTUJNkbxy/2qpfn5vBU7K4SrqeEXMwYuf/anUxTSDgJKm3HuQzFLXAFof948OwRMrQH4LxlYU80oKF0MofSSFw+WKWpJP4LErNBF1om0faV/glFp4uf0XKNhSD7gv6qOyZOv4fIByaTNq9jjkBL+tV9PWMmsB/JX6k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788274346; c=relaxed/simple; bh=aJvi9F0MSMrmfBnyNz5h25dwJB0c8DkIWVJBriIo1mw=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=sbuuy2oOT5buUpSmXCxZBLaf8uLhmPbeIZkbIUsPgAHyX2RB9M571OVB7IfuR6yf14rJQUuss7UVu2cVYfQuJUT/aBGBN6R4TNvKABnnaTXaiO19+48rhDjA7Vmk0zaz72nJYDZhqQEWSYw28dK37PgiP+3MZCT80eNhCvs/+4E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CdR0stIL; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CdR0stIL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA1411F000E9; Tue, 1 Sep 2026 14:52:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788274345; bh=aJvi9F0MSMrmfBnyNz5h25dwJB0c8DkIWVJBriIo1mw=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=CdR0stILD0ehYaSVMQAC7Y8dmi07S1oSBHa/zYXmEL5NMA/jCkvo2Z/RIsdoIgmsa ycWLZbLkchCWtZmq24JfMPgg3FEyansxDbj7iLl40/n6WaWtrNMeFTkg2H7oLko6vt zqVmrKxNsok76X87hkDP6VlfnBGS9nBqkGw/7JVPZF1o2Ry2tiMObsNI3zc9EhMvBn xr4UUZLSce7QTaK9G1UIiIy+zuc7JO9ruv/vww/dD5o+9khGME9rXJQl9T9n/ZMU1y GXaMfgP5Y+32uGXWPeYr7SRizPj7IdYMlTSVdcatkO1yEreKF6rLO0XG5ASlVbN9wP UX3YKNF1uaIKA== From: sashiko-bot@kernel.org Subject: Re: [PATCH] s390/topology: Enable ASYM_PACKING to establish cpu priority Reply-To: sashiko-reviews@lists.linux.dev To: "Mete Durlu" Cc: "Christian Borntraeger" , "Heiko Carstens" , "Alexander Gordeev" , linux-s390@vger.kernel.org, "Vasily Gorbik" In-Reply-To: <20260901-s390_sd_flags-v1-1-6755ba191d5a@linux.ibm.com> References: <20260901-s390_sd_flags-v1-1-6755ba191d5a@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 01 Sep 2026 14:52:24 +0000 Message-Id: <20260901145224.EA1411F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: > On s390 LPARs the hypervisor assigns varying CPU runtime capacities > under vertical polarization, making CPUs unequal. Add SD_ASYM_PACKING > into topology level flag callbacks so the scheduler keeps busier > scheduling groups packed onto higher-capacity CPUs. > Implement arch_asym_cpu_priority() using smp_cpu_get_capacity() as > the decision factor. Subtract the CPU number so that the CPUs with > lower ids are prioritized. >=20 > Only enabled on LPAR level as other guest levels either do not have > vertical polarization (which causes asymmetric CPUs), or machine backed > topology. >=20 > Signed-off-by: Mete Durlu Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260901-s390_sd_fl= ags-v1-1-6755ba191d5a@linux.ibm.com?part=3D1