cat /proc/meminfoget
MemTotal: XXX KB MemFree: XXX KB Buffers: XXX KB Cached: XXX KBsed
free memory = MemFree + Cached + Buffersdi
Used memory = MemTotal - free memorysse
MemTotal = Memory number passed by Linux CMD "mem=" - kernel data - Ramdisk- othersmemory
prorank developed by Android to get VSS/RSS/PSS/USSdata
others dumpsys meminfops