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Table 1 Kernel data sources in each operating system

From: Evaluation of desktop operating systems under thrashing conditions

OS Mechanism Counters
FreeBSD sysctl kern.cp_time
vm.stats.vm.v_swappgsin
vm.stats.vm.v_swappgsout
OpenSolaris kstat cpu_ticks_user
cpu_ticks_kernel
pgswapin
pgswapout
Linux /proc /proc/stat
/proc/vmstat
Windows XP perfmon CPU.%User Time
CPU.%Privileged Time
memory.Pages Input/sec
memory.Pages Output/sec