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?
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I think renice calls set_user_nice(), because renice is for processes already running. Nice is to start a process with modified nice value.. – user340 Aug 27 '12 at 03:31
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You realize those programs are open source? Search for GNU coreutils. – Karl Bielefeldt Aug 27 '12 at 04:32
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The nice and renice commands invoke the setpriority syscall. (You can discover this with strace.)
The setpriority function invokes the sys_setpriority function in the kernel (though you won't find that name in the kernel source directly; it's generated from the macro-expansion of SYSCALL_DEFINE3(setpriority, ...)).
ephemient
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1@BasileStarynkevitch Yes there is, but apparently `nice(1)` doesn't use it. – ephemient Aug 27 '12 at 13:57