From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 19 Oct 2002 23:18:16 -0700 From: "Martin J. Bligh" Reply-To: "Martin J. Bligh" Subject: Re: [PATCH 2.5.43-mm2] New shared page table patch Message-ID: <2458064740.1035069495@[10.10.2.3]> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: owner-linux-mm@kvack.org Return-Path: To: Bill Davidsen , Dave McCracken Cc: Andrew Morton , Linux Kernel , Linux Memory Management List-ID: >> For reference, one of the tests was TPC-H. My code reduced the number of >> allocated pte_chains from 5 million to 50 thousand. > > Don't tease, what did that do for performance? I see that someone has > already posted a possible problem, and the code would pass for complex for > most people, so is the gain worth the pain? In many cases, this will stop the box from falling over flat on it's face due to ZONE_NORMAL exhaustion (from pte-chains), or even total RAM exhaustion (from PTEs). Thus the performance gain is infinite ;-) M. -- 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/