From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 17 Aug 2005 15:19:29 -0700 (PDT) From: Christoph Lameter Subject: Re: pagefault scalability patches In-Reply-To: <20050817151723.48c948c7.akpm@osdl.org> Message-ID: References: <20050817151723.48c948c7.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Linus Torvalds , Hugh Dickins , Nick Piggin , linux-mm@kvack.org List-ID: On Wed, 17 Aug 2005, Andrew Morton wrote: > a) general increase of complexity The complexity is necesary in order to move to atomic operations that will also allow future enhancements. > b) the fact that they only partially address the problem: anonymous page > faults are addressed, but lots of other places aren't. The patches also allow atomic updates of pte flags. The most common bottleneck are anonymous faults. > c) the fact that they address one particular part of one particular > workload on exceedingly rare machines. No this is a general fix for anonymous page faults on SMP machines. As noted at the KS, other are seeing similar performance problems. -- 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