* mini-os: sbrk() doesn't allocate pages?
@ 2008-08-14 8:04 Gerd Hoffmann
2008-08-14 8:42 ` Gerd Hoffmann
2008-08-14 9:43 ` Samuel Thibault
0 siblings, 2 replies; 3+ messages in thread
From: Gerd Hoffmann @ 2008-08-14 8:04 UTC (permalink / raw)
To: Xen Development Mailing List
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?
wondering,
Gerd
--
http://kraxel.fedorapeople.org/xenner/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: mini-os: sbrk() doesn't allocate pages?
2008-08-14 8:04 mini-os: sbrk() doesn't allocate pages? Gerd Hoffmann
@ 2008-08-14 8:42 ` Gerd Hoffmann
2008-08-14 9:43 ` Samuel Thibault
1 sibling, 0 replies; 3+ messages in thread
From: Gerd Hoffmann @ 2008-08-14 8:42 UTC (permalink / raw)
To: Xen Development Mailing List
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/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: mini-os: sbrk() doesn't allocate pages?
2008-08-14 8:04 mini-os: sbrk() doesn't allocate pages? Gerd Hoffmann
2008-08-14 8:42 ` Gerd Hoffmann
@ 2008-08-14 9:43 ` Samuel Thibault
1 sibling, 0 replies; 3+ messages in thread
From: Samuel Thibault @ 2008-08-14 9:43 UTC (permalink / raw)
To: Gerd Hoffmann; +Cc: Xen Development Mailing List
Gerd Hoffmann, le Thu 14 Aug 2008 10:04:31 +0200, a écrit :
> I can't believe is is supposed to work that way.
That's how it usually works in unix environments :)
Samuel
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-08-14 8:04 mini-os: sbrk() doesn't allocate pages? Gerd Hoffmann
2008-08-14 8:42 ` Gerd Hoffmann
2008-08-14 9:43 ` Samuel Thibault
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