From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id D70196B0292 for ; Fri, 26 May 2017 09:35:05 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id n75so13345117pfh.0 for ; Fri, 26 May 2017 06:35:05 -0700 (PDT) Received: from mga14.intel.com (mga14.intel.com. [192.55.52.115]) by mx.google.com with ESMTPS id 7si893397pgt.334.2017.05.26.06.35.05 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 May 2017 06:35:05 -0700 (PDT) Date: Fri, 26 May 2017 06:35:04 -0700 From: Andi Kleen Subject: Re: [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging Message-ID: <20170526133504.GD24144@tassilo.jf.intel.com> References: <20170525203334.867-1-kirill.shutemov@linux.intel.com> <20170526130057.t7zsynihkdtsepkf@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170526130057.t7zsynihkdtsepkf@node.shutemov.name> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Linus Torvalds , "Kirill A. Shutemov" , Andrew Morton , the arch/x86 maintainers , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Dave Hansen , Andy Lutomirski , "linux-arch@vger.kernel.org" , linux-mm , Linux Kernel Mailing List > Even ignoring all of above, I don't see much benefit of having per-mm > switching. It adds complexity without much benefit -- saving few lines of > logic during early boot doesn't look as huge win to me. Also giving kthreads a different VM would prevent lazy VM switching when switching from/to idle, which can be quite important for performance when doing fast IO. -Andi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org