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

Edit File: sysc_mlockall.stp

# mlockall ___________________________________________________
# long sys_mlockall(int flags)
#

@define _SYSCALL_MLOCKALL_NAME
%(
	name = "mlockall"
%)

@define _SYSCALL_MLOCKALL_ARGSTR
%(
	argstr = flags_str
%)

@define _SYSCALL_MLOCKALL_REGARGS
%(
	flags = int_arg(1)
	flags_str = _mlockall_flags_str(flags)
%)

@define _SYSCALL_MLOCKALL_REGARGS_STORE
%(
        if (@probewrite(flags))
          set_int_arg(1, flags)
%)

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

# dw_mlockall _____________________________________________________

probe dw_syscall.mlockall = kernel.function("sys_mlockall").call ?
{
	@_SYSCALL_MLOCKALL_NAME
	flags = __int32($flags)
	flags_str = _mlockall_flags_str(flags)
	@_SYSCALL_MLOCKALL_ARGSTR
}
probe dw_syscall.mlockall.return = kernel.function("sys_mlockall").return ?
{
	@_SYSCALL_MLOCKALL_NAME
	@SYSC_RETVALSTR($return)
}

# nd_mlockall _____________________________________________________

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

probe nd1_syscall.mlockall = kprobe.function("sys_mlockall") ?
{
	@_SYSCALL_MLOCKALL_NAME
	asmlinkage()
	@_SYSCALL_MLOCKALL_REGARGS
	@_SYSCALL_MLOCKALL_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.mlockall = kprobe.function(@arch_syscall_prefix "sys_mlockall") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MLOCKALL_NAME
	@_SYSCALL_MLOCKALL_REGARGS
	@_SYSCALL_MLOCKALL_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_MLOCKALL_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mlockall = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mlockall"), @const("__NR_compat_mlockall"))
	@_SYSCALL_MLOCKALL_NAME
	@_SYSCALL_MLOCKALL_REGARGS
	@_SYSCALL_MLOCKALL_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_MLOCKALL_REGARGS_STORE %)
}

probe nd_syscall.mlockall.return = nd1_syscall.mlockall.return!, nd2_syscall.mlockall.return!, tp_syscall.mlockall.return
  { }
  
probe nd1_syscall.mlockall.return = kprobe.function("sys_mlockall").return ?
{
	@_SYSCALL_MLOCKALL_NAME
	@SYSC_RETVALSTR(returnval())
}

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