Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751790Ab2BJFOL (ORCPT ); Fri, 10 Feb 2012 00:14:11 -0500 Received: from mail-qw0-f46.google.com ([209.85.216.46]:41362 "EHLO mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750745Ab2BJFOK convert rfc822-to-8bit (ORCPT ); Fri, 10 Feb 2012 00:14:10 -0500 MIME-Version: 1.0 In-Reply-To: <20120209234844.GG19392@google.com> References: <4F315113.5010804@kernel.dk> <20120207164735.GH21292@google.com> <20120208162925.GA19392@google.com> <20120209175948.GE19392@google.com> <20120209192431.GF19392@google.com> <20120209234844.GG19392@google.com> Date: Fri, 10 Feb 2012 13:14:09 +0800 X-Google-Sender-Auth: tU6-0BVHbfFVZXDcLWpRycxeh_c Message-ID: Subject: Re: [PATCH] block: strip out locking optimization in put_io_context() From: Shaohua Li To: Tejun Heo Cc: Jens Axboe , Vivek Goyal , lkml , Knut Petersen , mroos@linux.ee, Linus Torvalds Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 871 Lines: 17 2012/2/10 Tejun Heo : > Hello, Shaohua. > > Can you please test the following one? ?It's probably the simplest > version w/o RCU and wq deferring. ?RCUfying isn't too bad but I'm > still a bit hesitant because RCU coverage needs to be extended to > request_queue via conditional synchronize_rcu() in queue exit path > (can't enforce delayed RCU free on request_queues and unconditional > synchronize_rcu() may cause excessive delay during boot for certain > configurations). ?It now can be done in the block core layer proper so > it shouldn't be as bad tho. ?If this too flops, I'll get to that. doesn't work. -- 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/