Linux free memory

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Hi,
how can I get the free memory in Linux? I am not quite sure but I am looking at the MemFree, Buffers and Cached fields in /proc/meminfo. They should give me the actual free memory. I am having embedded system without swap and I have conditions when Buffers go to zero. The system seems to work without problem. How bad is it if there is no memory for buffers? Can I rely on memory in Cached and Buffers without experiencing any problems? I should get performance problems then...

Regards,
Zax

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