Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753652Ab3ILOVW (ORCPT ); Thu, 12 Sep 2013 10:21:22 -0400 Received: from a194-81.smtp-out.amazonses.com ([199.255.194.81]:55859 "EHLO a194-81.smtp-out.amazonses.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752017Ab3ILOVS (ORCPT ); Thu, 12 Sep 2013 10:21:18 -0400 Date: Thu, 12 Sep 2013 14:21:17 +0000 From: Christoph Lameter X-X-Sender: cl@gentwo.org To: Joonsoo Kim cc: Pekka Enberg , Andrew Morton , David Rientjes , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 07/16] slab: overloading the RCU head over the LRU for RCU free In-Reply-To: <20130912065549.GC8055@lge.com> Message-ID: <00000141128c2585-743bf539-ce6f-45ef-a68e-3b4547a2af07-000000@email.amazonses.com> References: <1377161065-30552-1-git-send-email-iamjoonsoo.kim@lge.com> <1377161065-30552-8-git-send-email-iamjoonsoo.kim@lge.com> <000001410d765d3a-0f3f8df2-dccb-455a-a929-f1fd018700d2-000000@email.amazonses.com> <20130912065549.GC8055@lge.com> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-SES-Outgoing: 199.255.194.81 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1099 Lines: 24 On Thu, 12 Sep 2013, Joonsoo Kim wrote: > On Wed, Sep 11, 2013 at 02:39:22PM +0000, Christoph Lameter wrote: > > On Thu, 22 Aug 2013, Joonsoo Kim wrote: > > > > > With build-time size checking, we can overload the RCU head over the LRU > > > of struct page to free pages of a slab in rcu context. This really help to > > > implement to overload the struct slab over the struct page and this > > > eventually reduce memory usage and cache footprint of the SLAB. > > > > Looks fine to me. Can you add the rcu_head to the struct page union? This > > kind of overload is used frequently elsewhere as well. Then cleanup other > > cases of such uses (such as in SLUB). > > Okay. But I will implement it seprately because I don't know where the cases > are now and some inverstigation would be needed. Do it just for this case. The others can be done later. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/