Date: Sat, 1 Jan 2000 13:17:03 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Kirk McKusick <mckusick@flamingo.McKusick.COM>, Greg Lehey <grog@lemis.com>, Mike Smith <msmith@FreeBSD.ORG>, Tom <tom@uniserve.com>, freebsd-hackers@FreeBSD.ORG Subject: Slight mistake in my DaemonNews column Message-ID: <200001012117.NAA92971@apollo.backplane.com>
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Looks like the last set of corrections didn't get in before they published. http://www.daemonnews.org/200001/freebsd_vm.html In the section about "VM Objects" in one place I indicate that dead pages in B will not be reclaimed until B is collapsed, and near the end of this section I indicate that dead pages in B are reclaimed immediately. The first one is correct: Dead pages in B will not be reclaimed until B is collapsed. So, for example, if C1 and C2 both take a copy-on-write fault on the same page, copying that page from B, the page in B will now be inaccessible ('dead'), but the system will not be able to reclaim it until either C1 or C2 exit and the remaining Cn is collapsed into B. It can, however, swap it out, so no biggy. -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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