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How can I find what is occupying my low memory on 32 bit Linux OS?

cat /proc/meminfo |grep Low
LowTotal:         812908 kB
LowFree:           43340 kB


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free will tell you. But it's also in all the other fields in /proc/meminfo that you ignored with your grep. Most likely, it's page cache. – David Schwartz Oct 15 '12 at 23:09

Low memory (aka ZONE_NORMAL) is all kernelspace. It will be for things like kernel modules, buffers for your network and storage devices, filesystems, and pagecache.

You can cat /proc/slabinfo to see detailed usage.

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