From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754129AbbAEOwg (ORCPT ); Mon, 5 Jan 2015 09:52:36 -0500 Received: from resqmta-ch2-09v.sys.comcast.net ([69.252.207.41]:48934 "EHLO resqmta-ch2-09v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753441AbbAEOwe (ORCPT ); Mon, 5 Jan 2015 09:52:34 -0500 Date: Mon, 5 Jan 2015 08:52:30 -0600 (CST) From: Christoph Lameter X-X-Sender: cl@gentwo.org To: Joonsoo Kim cc: Andrew Morton , Pekka Enberg , David Rientjes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Jesper Dangaard Brouer , rostedt@goodmis.org, Thomas Gleixner Subject: Re: [PATCH 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off In-Reply-To: <1420421765-3209-1-git-send-email-iamjoonsoo.kim@lge.com> Message-ID: References: <1420421765-3209-1-git-send-email-iamjoonsoo.kim@lge.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 5 Jan 2015, Joonsoo Kim wrote: > Now, I reach the solution to remove preempt enable/disable in the fastpath. > If tid is matched with kmem_cache_cpu's tid after tid and kmem_cache_cpu > are retrieved by separate this_cpu operation, it means that they are > retrieved on the same cpu. If not matched, we just have to retry it. Acked-by: Christoph Lameter