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Currently, the "Memory" column is using the writable memory when available. While being a very good heuristics for identifying private process memory, it's damn slow to compute as it requires the whole memory map of the process. This is the single major culprit of the long-standing high CPU usage problem of the Process list in System Monitor. A much faster-to-compute approximation of private memory is the Resident Set Size (RSS), after subtracting the shared memory. While being an underestimation, it's still the best definition, roughly corresponding to the memory which would be freed by killing the process. This is the same value used by other popular system monitoring tools, like KSysGuard. This commit changes the definition of the Memory column from "writable" to "RSS - shared". Writable memory is no longer computed for every single process at every update of the list. Instead, it is just shown in the property dialog of the process. https://bugzilla.gnome.org/show_bug.cgi?id=524830
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