From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [PATCH -v4 1/2] lib, Make gen_pool memory allocator lockless Date: Wed, 17 Nov 2010 11:49:43 +0100 Message-ID: <1289990983.2109.678.camel@laptop> References: <1289868791-16658-1-git-send-email-ying.huang@intel.com> <1289868791-16658-2-git-send-email-ying.huang@intel.com> <20101116135038.fcaa90ca.akpm@linux-foundation.org> <1289960281.8719.1218.camel@yhuang-dev> <20101116183506.41e77e1a.akpm@linux-foundation.org> <1289963005.8719.1238.camel@yhuang-dev> <20101116195720.23287038.akpm@linux-foundation.org> <1289973914.8719.1261.camel@yhuang-dev> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Return-path: Received: from canuck.infradead.org ([134.117.69.58]:55280 "EHLO canuck.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756319Ab0KQKtq convert rfc822-to-8bit (ORCPT ); Wed, 17 Nov 2010 05:49:46 -0500 In-Reply-To: <1289973914.8719.1261.camel@yhuang-dev> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Huang Ying Cc: Andrew Morton , Len Brown , "linux-kernel@vger.kernel.org" , Andi Kleen , "linux-acpi@vger.kernel.org" , Linus Torvalds , Thomas Gleixner , Ingo Molnar , Mauro Carvalho Chehab , Steven Rostedt On Wed, 2010-11-17 at 14:05 +0800, Huang Ying wrote: > Hi, Peter, > > Do you think think irq_work should depend on that? Or we just > reimplement irq_work based on lockless list and make irq_work depends on > lockless list? If you can make it use a lockless list thing that's fine. I'm not sure Andrew's CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG makes much sense for CONFIG_ARCH_HAVE_NMI=n though.. Anyway, make sure to consolidate net/rds/xlist.h and its users, having two lockless lists is one too many. > At least as the first step, I prefer to just make lockless list depend > on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG. But only if the platform has NMIs, otherwise its moot.