From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f170.google.com (mail-ig0-f170.google.com [209.85.213.170]) by kanga.kvack.org (Postfix) with ESMTP id D069D6B006C for ; Fri, 24 Oct 2014 10:41:52 -0400 (EDT) Received: by mail-ig0-f170.google.com with SMTP id hn18so749022igb.1 for ; Fri, 24 Oct 2014 07:41:52 -0700 (PDT) Received: from resqmta-po-07v.sys.comcast.net (resqmta-po-07v.sys.comcast.net. [2001:558:fe16:19:96:114:154:166]) by mx.google.com with ESMTPS id e4si2335336igx.10.2014.10.24.07.41.51 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 24 Oct 2014 07:41:51 -0700 (PDT) Date: Fri, 24 Oct 2014 09:41:49 -0500 (CDT) From: Christoph Lameter Subject: Re: [RFC 0/4] [RFC] slub: Fastpath optimization (especially for RT) In-Reply-To: <20141024045630.GD15243@js1304-P5Q-DELUXE> Message-ID: References: <20141022155517.560385718@linux.com> <20141023080942.GA7598@js1304-P5Q-DELUXE> <20141024045630.GD15243@js1304-P5Q-DELUXE> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim Cc: akpm@linuxfoundation.org, rostedt@goodmis.org, linux-kernel@vger.kernel.org, Thomas Gleixner , linux-mm@kvack.org, penberg@kernel.org, iamjoonsoo@lge.com > I found that you said retrieving tid first is sufficient to do > things right in old discussion. :) Right but the tid can be obtained from a different processor. One other aspect of this patchset is that it reduces the cache footprint of the alloc and free functions. This typically results in a performance increase for the allocator. If we can avoid the page_address() and virt_to_head_page() stuff that is required because we drop the ->page field in a sufficient number of places then this may be a benefit that goes beyond the RT and CONFIG_PREEMPT case. -- 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