what is kernel managed memory and how can reduce memory?

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As im newbie to memory management and memory usage in linux . This question may be very trivial . still Here i have some doubts. Please suggest me if im wrong.

From cat /proc/meminfo which list memory usage and availability.

from this i can get to know Total avilabe RAM , free ram and many more of system.From this i can derive kernel manage memory .

Kernel Managed = MemTotal - (MemFree + Bufferes + Cached + AnonPages)

suppose from meminfo i hv below values.

Kernel Managed = 384.26M -(250.43M+ 1.73M+ 43.71M+71M)=17.4M

if kernel managed memory=17.4MB .

1)What exactly This Kernel managed memory means? How kernel is managing this memory where all it using?

2)Is it possible to reduce this memory e.g from 17MB to 12MB or still less?If so how i can do it?

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