From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 8 Nov 2004 09:01:27 -0800 (PST) From: Christoph Lameter Subject: Re: removing mm->rss and mm->anon_rss from kernel? In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Hugh Dickins Cc: "Martin J. Bligh" , Nick Piggin , Benjamin Herrenschmidt , linux-mm@kvack.org, linux-ia64@vger.kernel.org List-ID: On Mon, 8 Nov 2004, Hugh Dickins wrote: > > Maintaining these counters requires locking which interferes with Nick's > > and my attempts to parallelize the vm. > > Aren't you rather overestimating the importance of one single, > ideally atomic, increment per page fault? We would need to investigate that in detail. What we know is that if multiple cpus do atomic increments with an additional spinlock/unlock etc as done today then we do have a significant performance impact due to exclusive cache lines oscillating between cpus. > It's great news if this is really the major scalability issue facing Linux. Not sure. This may just be a part of it. -- 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: aart@kvack.org