No subject

SMDKC110 # bootm c0008000
Boot with zImage

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.35-rc4-00008-g98c749c (kgene at starstone) (gcc version =
4.4.1
(Sourcery G++ Lite 2009q3-67) ) #1 PREEMPT Mon Jul 12 18:47:04 KST 2010
CPU: ARMv7 Processor [412fc082] revision 2 (ARMv7), cr=3D10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: SMDKC110
...
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 80MB 256MB 128MB =3D 464MB total
Memory: 459616k/459616k available, 15520k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xff000000 - 0xffe00000   (  14 MB)
    vmalloc : 0xb8800000 - 0xe0000000   ( 632 MB)
    lowmem  : 0x80000000 - 0xb8000000   ( 896 MB)
    modules : 0x7f000000 - 0x80000000   (  16 MB)
      .init : 0x80008000 - 0x8001e000   (  88 kB)
      .text : 0x8001e000 - 0x801be000   (1664 kB)
      .data : 0x801ce000 - 0x801e6600   (  98 kB)
SLUB: Genslabs=3D9, HWalign=3D64, Order=3D0-3, MinObjects=3D0, CPUs=3D1, =
Nodes=3D1
Hierarchical RCU implementation.
        RCU-based detection of stalled CPUs is disabled.
        Verbose stalled-CPUs detection is disabled.
...

And SECTION_SIZE_BITS is 28, not 27.

> Thank you,
> Kyungmin Park
>=20
> On Mon, Jul 12, 2010 at 5:32 PM, Kukjin Kim <kgene.kim at samsung.com> =
wrote:
> > Russell,
> >
> > Hi,
> >
> > Kukjin Kim wrote:
> >> Russell wrote:
> >> > So, memory starts at 0x20000000 and finishes at 0x25000000. =
=A0That's
> > fine.
> >> > That doesn't mean the section size is 16MB.
> >> >
> >> > As I've already said, the section size has _nothing_ what so ever =
to
do
> >> > with the size of memory, or the granularity of the size of =
memory.
=A0By
> >> > way of illustration, it is perfectly legal to have a section size =
of
> >> > 256MB but only have 1MB in a section and this is perfectly legal. =
=A0So
> >> > sections do not have to be completely filled.
> >> >
> >> Actually, as you know, the hole's area of mem_map is freed from =
bootmem
if
> > a
> >> section has a hole when initializing sparse memory.
> >>
> >> I identified that a section doesn't need to be a contiguous area of
> > physical
> >> memory when reading your comment with the fact that the mem_map of =
a
> > section
> >> can be smaller than the size of a section.
> >>
> >> I found, however, the kernel panics when modifying min_free_kbytes =
file
in
> >> the proc filesystem if a section has a hole.
> >>
> >> While processing the change of min_free_kbytes in the kernel, page
> >> descriptors in a hole of an online section is accessed.
> >
> > As I said, following error happens.
> > It would be helpful to me if any opinions or comments.
> >
> > ---


(snip)


Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim at samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.