From nobody Sun Feb 8 15:58:50 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2D64E28399 for ; Mon, 2 Dec 2024 04:37:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733114250; cv=none; b=Z1j0kjezhCJ0OBTgHjE77JN6+ckuj1D4w4XRkowvXSqw/WZcDiAoPQSDNcP6sEG2eHVmUQ1Dt8cbHS9fYsiBYfQHQouw6VQMACpNhBianRxzQp6F/XEtaMl3QUYjRO3zPi0NgPgtMY4iTKI/E92FZAasYB6gSOZDQkV4F0V/JzM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733114250; c=relaxed/simple; bh=+IHqiU68nSaL7ZK/oJSrSXnG+TpPlvwPV40O8Iua4xk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=S+2M86ZGyHZE5Uq/oOomzJAt+tKvZBl6vuSkXzHWKH4cSkKpBbwEzgIFWy8yQ5vS8nstaUTPd/vrw63g6fn4Rlr/fPwH9bJrs6mAwkBGeWe6F7cYsn6D7hXRMZShodxCAhL3e0RO3XT7Qy5g27VPEsd6iXdQa4+eJt5dxzSibeg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pCqwI7h+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pCqwI7h+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B84C5C4CED2; Mon, 2 Dec 2024 04:37:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733114249; bh=+IHqiU68nSaL7ZK/oJSrSXnG+TpPlvwPV40O8Iua4xk=; h=From:To:Cc:Subject:Date:From; b=pCqwI7h+ftZtdU79pIV9TfmOEWD9BsedW/+LXHsCspLgUPttTHYWUTi5o8G/+q6BP pLTXakpqyvokkiI768mjq1AFxyf9bOlF9RaXqI707IHn7EoSJzAbD6bfxE6Gwvqlga ub4bfx1s6vwF+5UylWrFzpTahdxhRcp94kJYz2Rb81H7OGWX5wFJmwS17ZLY62oJL9 B/wLRw/CcDo8N5w3brdeDemS75a5hyfgQfMUz30V9rJ4gccBcUrtsEXVDYjBaagDhm cnqYpqLxyb8l2tvvMdKDTJrVX4Luf70NH2SzWQZ3FebeHfdO2dZ/BJ5GFEOKEtcitL V1j01QWYTYr4g== From: Mario Limonciello To: Borislav Petkov Cc: Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), "H . Peter Anvin" , Mario Limonciello , linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Shyam Sundar S K , Perry Yuan Subject: [PATCH] x86/cpu: Enable SD_ASYM_PACKING for PKG domain on systems with AMD preferred cores Date: Sun, 1 Dec 2024 22:37:24 -0600 Message-ID: <20241202043724.3929062-1-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Mario Limonciello For the scheduler to use and prefer AMD preferred core rankings set SD_ASYM_PACKING for x86_die_flags(). Signed-off-by: Mario Limonciello --- arch/x86/kernel/smpboot.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index b5a8f0891135b..419e7ae096395 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -62,6 +62,8 @@ #include #include =20 +#include + #include #include #include @@ -497,10 +499,19 @@ static int x86_cluster_flags(void) =20 static int x86_die_flags(void) { - if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU) || - cpu_feature_enabled(X86_FEATURE_AMD_HETEROGENEOUS_CORES)) + if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)) return x86_sched_itmt_flags(); =20 + switch (boot_cpu_data.x86_vendor) { + case X86_VENDOR_AMD: + case X86_VENDOR_HYGON: + bool prefcore =3D false; + + amd_detect_prefcore(&prefcore); + if (prefcore || cpu_feature_enabled(X86_FEATURE_AMD_HETEROGENEOUS_CORES)) + return x86_sched_itmt_flags(); + }; + return 0; } =20 base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37 --=20 2.43.0