From nobody Tue Apr 30 01:18:17 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=citrix.com ARC-Seal: i=1; a=rsa-sha256; t=1608334790; cv=none; d=zohomail.com; s=zohoarc; b=d6haYDwlqKKXADMFIVhx3lOILFMAmBNmu43N0veC/WLfkLYUJiEJdNgXaUA4i9ePzu+Tsja3UOBVqFwxhY3e9eLIny8it54runa0Bd7U+TKvdGWlz270fOerBrO2mGGlDSb/g3oqkSTbwWzI2FhIVeStOEFg8kcDN+0rw5En6gQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1608334790; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=TgAc+QZQvQul6raxbuxgxfK2RbrmhkSGpZc7cfAaqyY=; b=VBwW+5SA+Fcmup9oenXlE1aFH03FPiYVZTla2perAkG2kNBQzQvmrVB5XKKCh4sn8v5CtJZYNwojO3GjslVNd48I47XjYsBJMbtoasewqBuIUiLgi2nwLK5Pp0kYda5bixtHAY7wrs8VXzZKYRCJga3AajdqRvv1qm+S0Pf8pfI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=reject dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1608334790726793.0178337089557; Fri, 18 Dec 2020 15:39:50 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.56753.99460 (Exim 4.92) (envelope-from ) id 1kqPL6-0002PI-Bv; Fri, 18 Dec 2020 23:39:12 +0000 Received: by outflank-mailman (output) from mailman id 56753.99460; Fri, 18 Dec 2020 23:39:12 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kqPL6-0002PB-8M; Fri, 18 Dec 2020 23:39:12 +0000 Received: by outflank-mailman (input) for mailman id 56753; Fri, 18 Dec 2020 23:39:11 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kqPL5-0002P6-2g for xen-devel@lists.xenproject.org; Fri, 18 Dec 2020 23:39:11 +0000 Received: from esa5.hc3370-68.iphmx.com (unknown [216.71.155.168]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 1017ef90-350a-4de9-a0c5-8a122d09e37a; Fri, 18 Dec 2020 23:39:09 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 1017ef90-350a-4de9-a0c5-8a122d09e37a DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1608334749; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=jNHKbYTTBr5uWlZ+nqwtHXf5IXemodP6GeLyGxYrL+M=; b=SWTI8tGtBx0bkUvcBy7v+Eq04WoFTNBnJMZWxlf6UY2XBPHHdsWLz6+o 4qOxdPCs0jq1aCFBNmX5wowjYzF1Z2857PlIfHrRYERw2t2VLfT5yMqOL VC00LE/g8M4mh7zJXh48npBor2yoiWad7+DotIUclHVXFb2YjoJssriUI 8=; Authentication-Results: esa5.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: uXSwno8/MTAbO3X2QdFfay/uiXzNeBGegxgSext7SNv35qDrbTOgM1ByyhMeCALLa/lJJmg6pt sRkrYvP57DdHzp+ikkzarTTrYYFkRdjRXgSGo40Cgs4D04taCQFApEXUmkzVFAalQc8J5iKMG0 WdWXoqp/rY+HbR9sqvajclGW7WRP9L/Mq4SW9QesoJDiAjrKtb62fR/vZ+XtmqOH8WShXmnCQ4 kKji7sZyAka8z+OuDFyE9NfFv433vM2oj8c4KF4zXfwQSuosv/5BTKbIoHo1BYQY1cJ9iw0nqn MzM= X-SBRS: 5.2 X-MesageID: 33594741 X-Ironport-Server: esa5.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.78,431,1599537600"; d="scan'208";a="33594741" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Subject: [PATCH] xen/Kconfig: Correct the NR_CPUS description Date: Fri, 18 Dec 2020 23:38:42 +0000 Message-ID: <20201218233842.5277-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) The description "physical CPUs" is especially wrong, as it implies the numb= er of sockets, which tops out at 8 on all but the very biggest servers. NR_CPUS is the number of logical entities the scheduler can use. Reported-by: hanetzer@startmail.com Signed-off-by: Andrew Cooper Acked-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: hanetzer@startmail.com --- xen/arch/Kconfig | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/xen/arch/Kconfig b/xen/arch/Kconfig index 1954d1c5c1..d144d4c8d3 100644 --- a/xen/arch/Kconfig +++ b/xen/arch/Kconfig @@ -1,11 +1,17 @@ =20 config NR_CPUS - int "Maximum number of physical CPUs" + int "Maximum number of CPUs" range 1 4095 default "256" if X86 default "8" if ARM && RCAR3 default "4" if ARM && QEMU default "4" if ARM && MPSOC default "128" if ARM - ---help--- - Specifies the maximum number of physical CPUs which Xen will support. + help + Controls the build-time size of various arrays and bitmaps + associated with multiple-cpu management. It is the upper bound of + the number of logical entities the scheduler can run code on. + + For CPU cores which support Simultaneous Multi-Threading or similar + technologies, this the number of logical threads which Xen will + support. --=20 2.11.0