Hi All,

I am using Openwrt 16.02 BSP (Linux 4.4.0) on Gate-works GW5410 Hardware. Recently i noticed the memory mapping of the linux kernel

root@OpenWrt:/# cat /proc/meminfo
MemTotal:        1032060 kB
MemFree:          946216 kB
MemAvailable:     971408 kB
Buffers:                 8404 kB
Cached:              23448 kB
SwapCached:            0 kB
Active:                  25396 kB
Inactive:               8312 kB
Active(anon):       1920 kB
Inactive(anon):       60 kB
Active(file):           23476 kB
Inactive(file):         8252 kB
Unevictable:            0 kB
Mlocked:                 0 kB
SwapTotal:              0 kB
SwapFree:              0 kB
Dirty:                       0 kB
Writeback:             0 kB
AnonPages:          1908 kB
Mapped:                6016 kB
Shmem:                 124 kB
Slab:                      22732 kB
SReclaimable:       7216 kB
SUnreclaim:           15516 kB
KernelStack:          1136 kB
PageTables:          348 kB
NFS_Unstable:      0 kB
Bounce:                  0 kB
WritebackTmp:       0 kB
CommitLimit:        516028 kB
Committed_AS:       6040 kB
VmallocTotal:        1032192 kB
VmallocUsed:           0 kB
VmallocChunk:         0 kB
root@OpenWrt:/#

The VmallocChunk shows 0 KB, but total of around 1 GB is available for Vmalloc area. The total RAM area of the system is also 1 GB.  Why the VmallocChunk shows 0 KB. Is it possible to kernel modules to use this vmalloc memory. Anything wrong with Memory mapping .

Thanks in advance

In current git of vanilla linux, of tpday

git grep VmallocChunk
fs/proc/meminfo.c:135:  show_val_kb(m, "VmallocChunk:   ", 0ul);

I assume this is same on older version.
and of course also for VmallocUsed