From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <44549D96.2050004@yahoo.com.au> Date: Sun, 30 Apr 2006 21:20:54 +1000 From: Nick Piggin MIME-Version: 1.0 Subject: Re: Lockless page cache test results References: <20060426135310.GB5083@suse.de> <20060426095511.0cc7a3f9.akpm@osdl.org> <20060426174235.GC5002@suse.de> <20060426111054.2b4f1736.akpm@osdl.org> <20060426114737.239806a2.akpm@osdl.org> <20060426184945.GL5002@suse.de> <20060428140146.GA4657648@melbourne.sgi.com> <44548834.5050204@yahoo.com.au> In-Reply-To: <44548834.5050204@yahoo.com.au> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: David Chinner Cc: Christoph Lameter , Jens Axboe , Andrew Morton , linux-kernel@vger.kernel.org, npiggin@suse.de, linux-mm@kvack.org List-ID: Nick Piggin wrote: > As well as lockless pagecache, I think we can batch tree_lock operations > in readahead. Would be interesting to see how much this patch helps. Btw. the patch introduces multiple locked pages in pagecache from a single thread, however there should be no new deadlocks or lock orderings introduced. They are always aquired because they are new pages, so will all be released. Visibility from other threads is no different to the case where multiple pages locked by multiple threads. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com -- 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