From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from merlin.infradead.org ([205.233.59.134]:50972 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731822AbeLQIgd (ORCPT ); Mon, 17 Dec 2018 03:36:33 -0500 Date: Mon, 17 Dec 2018 09:36:06 +0100 From: Peter Zijlstra To: Barry Kauler Cc: Jiri Kosina , Andi Kleen , Greg KH , Thomas Gleixner , Andy Lutomirski , Linus Torvalds , Tom Lendacky , Josh Poimboeuf , Andrea Arcangeli , David Woodhouse , Tim Chen , Dave Hansen , Casey Schaufler , Asit Mallick , Arjan van de Ven , Jon Masters , Waiman Long , Dave Stewart , Kees Cook , stable@vger.kernel.org Subject: Re: SCHEDL_SMT forced on! Message-ID: <20181217082837.GA27095@worktop> References: <20181216082746.GB29097@kroah.com> <20181216173912.GQ25620@tassilo.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: stable-owner@vger.kernel.org List-ID: On Mon, Dec 17, 2018 at 05:58:11AM +0800, Barry Kauler wrote: > > "SMT is a distinct feature, separate from SMP, and I think that it is > important to keep that distinction." Note that building a kernel without CONFIG_SCHED_SMT does _NOT_ disable SMT. All it accomplishes is that the scheduler will not be SMT aware and consider each SMT-sibling as a fully independent CPU.