Leland, If you're looking at code for that swapping algorithm: what happens when highest priority swap area (swap1) gets to the end, swap1 has free slots and the next higher priority swap area (swap2) has free clusters? Does linux start over at the beginning of swap1 and fill swap1 before allocating from swap2?
-------------------------------------------------------- This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Leland Lucius Sent: Monday, December 03, 2007 10:26 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Is 275GB of VDISK stupid? On 12/3/07 2:55 AM, "Rob van der Heij" <[EMAIL PROTECTED]> wrote: > > Because of the Linux algorithm for using swap, a VDISK used for swap > even a little will eventually be used completely. > I realize that VDISK is special in the world of Linux, but why doesn't someone give us the option of preventing this? Looks to me like adding one line in swapfile.c would allow pages to cluster at the beginning of a disk instead of running to the end and starting over at the beginning. si->flags += SWP_SCANNING; ---> goto lowest; if (unlikely(!si->cluster_nr)) { So, just make this a configurable option via procfs and let us decide. :-) Leland
