From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: In-Reply-To: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Jun 2001 19:47:26 +0100 From: Jonathan Morton Subject: Re: VM tuning patch, take 2 Sender: owner-linux-mm@kvack.org Return-Path: To: Marcelo Tosatti Cc: linux-mm@kvack.org List-ID: >> - new pages are still given an age of PAGE_AGE_START, which is 2. >> PAGE_AGE_ADV has been increased to 4, and PAGE_AGE_MAX to 128. Pages which >> are demand-paged in from swap are given an initial age of PAGE_AGE_MAX/2, >> or 64 - this should help to keep these (expensive) pages around for as long >> as possible. Ageing down is now done using a decrement instead of a >> division by 2, preserving the age information for longer. > >Just one comment about this specific change. I would not like to tweak the >PAGE_AGE_* values until we have centralized page aging. (ie only kswapd >doing the aging) I forgot to mention, I also have applied the patch which causes allocations to wait on kswapd. As far as I can tell, the actual numbers attached to the ageing matter far less than how they are applied. -------------------------------------------------------------- from: Jonathan "Chromatix" Morton mail: chromi@cyberspace.org (not for attachments) The key to knowledge is not to rely on people to teach you it. GCS$/E/S dpu(!) s:- a20 C+++ UL++ P L+++ E W+ N- o? K? w--- O-- M++$ V? PS PE- Y+ PGP++ t- 5- X- R !tv b++ DI+++ D G e+ h+ r++ y+(*) -- 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/