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Dir : ~/usr/share/systemtap/tapset/linux/

Edit File: sysc_nice.stp

# nice _______________________________________________________
# long sys_nice(int increment)
#

@define _SYSCALL_NICE_NAME
%(
	name = "nice"
%)

@define _SYSCALL_NICE_ARGSTR
%(
	argstr = sprintf("%d", inc)
%)

@define _SYSCALL_NICE_REGARGS
%(
	inc = int_arg(1)
%)

@define _SYSCALL_NICE_REGARGS_STORE
%(
        if (@probewrite(inc))
          set_int_arg(1, inc)
%)

probe syscall.nice = dw_syscall.nice !, nd_syscall.nice ? {}
probe syscall.nice.return = dw_syscall.nice.return !, nd_syscall.nice.return ? {}

# dw_nice _____________________________________________________

probe dw_syscall.nice = kernel.function("sys_nice").call ?
{
	@_SYSCALL_NICE_NAME
	inc = __int32($increment)
	@_SYSCALL_NICE_ARGSTR
}
probe dw_syscall.nice.return = kernel.function("sys_nice").return ?
{
	@_SYSCALL_NICE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_nice _____________________________________________________

probe nd_syscall.nice = nd1_syscall.nice!, nd2_syscall.nice!, tp_syscall.nice
  { }

probe nd1_syscall.nice = kprobe.function("sys_nice") ?
{
	@_SYSCALL_NICE_NAME
	asmlinkage()
	@_SYSCALL_NICE_REGARGS
	@_SYSCALL_NICE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.nice = kprobe.function(@arch_syscall_prefix "sys_nice") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_NICE_NAME
	@_SYSCALL_NICE_REGARGS
	@_SYSCALL_NICE_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_NICE_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.nice = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_nice"), @const("__NR_compat_nice"))
	@_SYSCALL_NICE_NAME
	@_SYSCALL_NICE_REGARGS
	@_SYSCALL_NICE_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_NICE_REGARGS_STORE %)
}

probe nd_syscall.nice.return = nd1_syscall.nice.return!, nd2_syscall.nice.return!, tp_syscall.nice.return
  { }
  
probe nd1_syscall.nice.return = kprobe.function("sys_nice").return ?
{
	@_SYSCALL_NICE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.nice.return = kprobe.function(@arch_syscall_prefix "sys_nice").return ?
{
	@_SYSCALL_NICE_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.nice.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_nice"), @const("__NR_compat_nice"))
	@_SYSCALL_NICE_NAME
	@SYSC_RETVALSTR($ret)
}