Re: [Xen-devel] mini-os: sbrk() doesn't allocate pages?

[Gerd Hoffmann <kraxel@xxxxxxxxxx>]

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/

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