How to interpret cat /proc/meminfo

[sandeep kumar]

Hi all,
Here in my device cat /proc/meminfo is showing the following result,
MemTotal:         767960 kB
MemFree:          104252 kB
Buffers:           14696 kB
Cached:           183676 kB
SwapCached:            0 kB
Active:           304596 kB
Inactive:         282020 kB
Active(anon):     250560 kB
Inactive(anon):   139488 kB
Active(file):      54036 kB
Inactive(file):   142532 kB
Unevictable:         988 kB
Mlocked:               0 kB
HighTotal:        536576 kB
HighFree:          23408 kB
LowTotal:         231384 kB
LowFree:           80844 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:        389252 kB
Mapped:            94368 kB
Shmem:               816 kB
Slab:              17932 kB
SReclaimable:       7388 kB
SUnreclaim:        10544 kB
KernelStack:        5912 kB
PageTables:        20064 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:      383980 kB
Committed_AS:    3685728 kB
VmallocTotal:     434176 kB
VmallocUsed:      261584 kB
VmallocChunk:     115324 kB

&&

My kernel virtual memory lay out is like this,
<5>[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
<5>[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
<5>[    0.000000]     DMA     : 0xff000000 - 0xffe00000   (  14 MB)
<5>[    0.000000]     vmalloc : 0xdf800000 - 0xfa000000   ( 424 MB)
<5>[    0.000000]     lowmem  : 0xc0000000 - 0xdf000000   ( 496 MB)
<5>[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
<5>[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
<5>[    0.000000]       .init : 0xc0008000 - 0xc0049000   ( 260 kB)
<5>[    0.000000]       .text : 0xc0100000 - 0xc0a26000   (9368 kB)
<5>[    0.000000]       .data : 0xc0b00000 - 0xc0c464c0   (1306 kB)
&&
 In the kernel command line i had put the "vmalloc=432MB" , to reserve the
vmalloc area.

My question is,
While in the kernel memory layout, lowmem is shown as 496MB,
in /proc/meminfo LowMEMtotal is only 231MB.
Why is the difference between the two?

How to increase the Lowmem size with reserving my vmalloc region
memory(432MB)

-- 
With regards,
Sandeep Kumar Anantapalli,
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