From mboxrd@z Thu Jan  1 00:00:00 1970
From: ruby young <yangyang@les.buaa.edu.cn>
Subject: Questions about memory zone
Date: Tue, 5 May 2009 16:05:15 +0800
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Hi, all~
I'm interested in memory of xen. And I wondered what does the real mean of
xen 'zone'. It seems different from linux 'zone'.
In the source code of xen-3.3.0/xen/common/page_alloc.c, there is defined:
#define pfn_dom_zone_type(_pfn) (fls(_pfn)-1)

and NR_ZONES is defined:
#define NR_ZONES (PADDR_BITS - PAGE_SHIFT)

It seems Zone in xen set up as physic address and are separate by the last
pfn bit set.
But Why does Xen Zone organize like this? And What does the Zone mean?

Best Wishes!


Ruby Young

--=20
Best wishes

=D1=EE=D1=FA
=B1=B1=BE=A9=BA=BD=BF=D5=BA=BD=CC=EC=B4=F3=D1=A7=BC=C6=CB=E3=BB=FA=D1=A7=D4=
=BA=CC=E5=CF=B5=BD=E1=B9=B9=D1=D0=BE=BF=CB=F9
=B5=E7=BB=B0:010-82338059-132
=D3=CA=BC=FE:9907yruby@gmail.com
=B5=D8=D6=B7=A3=BA=B1=B1=BE=A9=CA=D0=BA=A3=B5=ED=C7=F8=D1=A7=D4=BA=C2=B737=
=BA=C5=B1=B1=BE=A9=BA=BD=BF=D5=BA=BD=CC=EC=B4=F3=D1=A7=D0=C2=D6=F7=C2=A5 G=
=D7=F91026
---------------------------------------------------------------------------=
-----
Yang Yang
Institute of Computer Architecture and System
BeiHang University=A3=A8BUAA=A3=A9
Tel: (86-10)82338059-132
Email: 9907yruby@gmail.com
Addr: Room 1026,Building G,The New Main Building,37# Xueyuan Rd.,Haidian
District, Beijing 100083, PRC

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<div>Hi, all~</div>
<div>I&#39;m interested in memory of xen. And I wondered what does the real=
 mean of xen &#39;zone&#39;. It seems different from linux &#39;zone&#39;. =
</div>
<div>In the source code of xen-3.3.0/xen/common/page_alloc.c, there is defi=
ned:</div>
<div><font style=3D"BACKGROUND-COLOR: #ffff66">#define pfn_dom_zone_type(_p=
fn) (fls(_pfn)-1)</font></div>
<div>&nbsp;</div>
<div>and NR_ZONES is defined:</div>
<div><font style=3D"BACKGROUND-COLOR: #ffff66">#define NR_ZONES (PADDR_BITS=
 - PAGE_SHIFT)</font></div>
<div><font style=3D"BACKGROUND-COLOR: #ffff66"></font>&nbsp;</div>
<div><font style=3D"BACKGROUND-COLOR: #ffffff"></font>It seems Zone in xen =
set up as&nbsp;physic address and are separate by the last pfn bit set.</di=
v>
<div>But Why does Xen Zone organize like this? And What does the Zone mean?=
</div>
<div>&nbsp;</div>
<div>Best Wishes!</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ruby Young<br clear=
=3D"all"></div>
<div></div><br>-- <br>Best wishes<br><br>=D1=EE=D1=FA<br>=B1=B1=BE=A9=BA=BD=
=BF=D5=BA=BD=CC=EC=B4=F3=D1=A7=BC=C6=CB=E3=BB=FA=D1=A7=D4=BA=CC=E5=CF=B5=BD=
=E1=B9=B9=D1=D0=BE=BF=CB=F9<br>=B5=E7=BB=B0:010-82338059-132<br>=D3=CA=BC=
=FE:<a href=3D"mailto:9907yruby@gmail.com">9907yruby@gmail.com</a><br>=B5=
=D8=D6=B7=A3=BA=B1=B1=BE=A9=CA=D0=BA=A3=B5=ED=C7=F8=D1=A7=D4=BA=C2=B737=BA=
=C5=B1=B1=BE=A9=BA=BD=BF=D5=BA=BD=CC=EC=B4=F3=D1=A7=D0=C2=D6=F7=C2=A5 G=D7=
=F91026<br>----------------------------------------------------------------=
----------------<br>
Yang Yang<br>Institute of Computer Architecture and System <br>BeiHang Univ=
ersity=A3=A8BUAA=A3=A9<br>Tel: (86-10)82338059-132<br>Email: <a href=3D"mai=
lto:9907yruby@gmail.com">9907yruby@gmail.com</a><br>Addr: Room 1026,Buildin=
g G,The New Main Building,37# Xueyuan Rd.,Haidian District, Beijing 100083,=
 PRC<br>

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