From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f169.google.com (mail-ie0-f169.google.com [209.85.223.169]) by kanga.kvack.org (Postfix) with ESMTP id 813166B0038 for ; Thu, 11 Dec 2014 12:18:34 -0500 (EST) Received: by mail-ie0-f169.google.com with SMTP id y20so5282591ier.0 for ; Thu, 11 Dec 2014 09:18:34 -0800 (PST) Received: from resqmta-po-05v.sys.comcast.net ([2001:558:fe16:19:250:56ff:feb0:2995]) by mx.google.com with ESMTPS id n4si1912705ige.9.2014.12.11.09.18.32 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Thu, 11 Dec 2014 09:18:33 -0800 (PST) Date: Thu, 11 Dec 2014 11:18:31 -0600 (CST) From: Christoph Lameter Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1 In-Reply-To: <20141211175058.64a1c2fc@redhat.com> Message-ID: References: <20141210163017.092096069@linux.com> <20141211143518.02c781ee@redhat.com> <20141211175058.64a1c2fc@redhat.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Jesper Dangaard Brouer Cc: akpm@linuxfoundation.org, rostedt@goodmis.org, linux-kernel@vger.kernel.org, Thomas Gleixner , linux-mm@kvack.org, penberg@kernel.org, iamjoonsoo.kim@lge.com On Thu, 11 Dec 2014, Jesper Dangaard Brouer wrote: > I was expecting to see at least (specifically) 4.291 ns improvement, as > this is the measured[1] cost of preempt_{disable,enable] on my system. Right. Those calls are taken out of the fastpaths by this patchset for the CONFIG_PREEMPT case. So the numbers that you got do not make much sense to me. -- 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