TRACE_PUTS(9) Driver Basics TRACE_PUTS(9)
NAME
trace_puts - write a string into the ftrace buffer
SYNOPSIS
trace_puts(str);
ARGUMENTS
str
the string to record
NOTE
__trace_bputs is an internal function for trace_puts and the ip is passed in via the trace_puts macro.
This is similar to trace_printk but is made for those really fast paths that a developer wants the least amount of "Heisenbug" affects,
where the processing of the print format is still too much.
This function allows a kernel developer to debug fast path sections that printk is not appropriate for. By scattering in various printk
like tracing in the code, a developer can quickly see where problems are occurring.
This is intended as a debugging tool for the developer only. Please refrain from leaving trace_puts scattered around in your code. (Extra
memory is used for special buffers that are allocated when trace_puts is used)
RETURNS
0 if nothing was written, positive # if string was. (1 when __trace_bputs is used, strlen(str) when __trace_puts is used)
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 TRACE_PUTS(9)
