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Re: [Xen-devel] mini-os: sbrk() doesn't allocate pages?
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| Subject: | Re: [Xen-devel] mini-os: sbrk() doesn't allocate pages? |
| From: | Gerd Hoffmann <kraxel@xxxxxxxxxx> |
| Date: | Thu, 14 Aug 2008 10:42:04 +0200 |
| Delivery-date: | Thu, 14 Aug 2008 01:42:30 -0700 |
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Gerd Hoffmann wrote: > Hi, > > I'm wondering how the mini-os heap allocater work. The sbrk() function > in mm.c seems to *not* allocate pages for the heap. Instead it uses the > zero page and maps it into the heap space when a new page is needed ... > > I can't believe is is supposed to work that way. Is that a bug? Did I > miss some logic somewhere in the code? Oh, cow in the pagefault handler, that is the missing bit ... cheers, Gerd -- http://kraxel.fedorapeople.org/xenner/ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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