Date: Sat, 13 Jul 2002 03:17:33 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: David Schultz <dschultz@uclink.Berkeley.EDU>, Sean Kelly <smkelly@zombie.org>, hackers@FreeBSD.ORG Subject: Re: swapoff? Message-ID: <3D2FFE3D.83E0CCF9@mindspring.com> References: <20020713040247.GA82181@edgemaster.zombie.org> <20020713052337.GA662@HAL9000.wox.org> <20020713053236.GA884@HAL9000.wox.org> <200207130652.g6D6qI93076722@apollo.backplane.com>
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Matthew Dillon wrote: > * Flag the swap device being removed and then scan all OBJT_SWAP > VM Objects looking for swap blocks associated with the device, > and force a page-in of those blocks. The getpages code for the > swap backing store would detect the flag and not clear the swap > bitmap bits as it pages-in the data. > > (Forcing a pagein may force pages to cycle back out to another > swap device, so special treatment of the paged-in pages (like > immediately placing it in the VM page cache instead of the > active or inactive queues) is necessary to reduce load effects > on the system. Uh... so you set the bit that tells you it's allocated to prevent it being allocated? When I swap something in and the bit is set, how do I know that it's in, except that it's not allocated? In other words, I do what you say... how do I know when the device has been drained out, vs. being in use? I think you have to disable swapping to the device some other way, and then return fromt he "swapoff" only when the bitmap is all zero. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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