On Thu, 19 Aug 2010, Patrick O'Callaghan wrote: > On Thu, 2010-08-19 at 09:22 -0500, Michael Hennebry wrote: >> On Thu, 19 Aug 2010, Gregory Hosler wrote: >> >>> If the memory gets fragged and the kernel wants to defrag, e.g. for a memory >>> request from an application, in order to defrag any "dirty" data portions (those >>> pages that have been written to), the kernel *requires* there to be swap. >>> Otherwise there is no place to write the dirty pages out, in order to read them >>> in elsewhere. >> >> I didn't realize that memory could get fragged. >> I'd thought that one reason for virtual memory >> was allowing pages to be renumbered at will, >> the kernel's will, of course. > > I thought so too, but see: http://lwn.net/Articles/211505/ Posted November 28, 2006 by corbet: > If a large ("high order") block of memory is not available when needed, > something will fail and yet another user will start to consider switching to BSD. BSD does it differently? -- Michael hennebry@xxxxxxxxxxxxxxxxxxxxx "Pessimist: The glass is half empty. Optimist: The glass is half full. Engineer: The glass is twice as big as it needs to be." -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
