I am interested in knowing what are the kernel side methods that get called when you issue the nice and renice commands? I found the set_user_nice() in the kernel side. However it's arguments are not pid and nice value, which we use when we issue the command renice(a taskstruct & nice value). Dose anyone know what functions gets called when you issue nice & renice commands?
Nice and Renice commands
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The
niceandrenicecommands invoke thesetprioritysyscall. (You can discover this withstrace.)The
setpriorityfunction invokes thesys_setpriorityfunction in the kernel (though you won't find that name in the kernel source directly; it's generated from the macro-expansion ofSYSCALL_DEFINE3(setpriority, ...)).