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Commit 459c6d15 authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

tracing: Document HAVE_SYSCALL_TRACEPOINTS needs 



Document the arch needed requirements to get the support for syscalls
tracing.

v2: HAVE_FTRACE_SYSCALLS have been changed to HAVE_SYSCALL_TRACEPOINTS
    recently. Update this config name in the documentation then.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Acked-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
parent c44fc770

Documentation/trace/ftrace-design.txt

+11 −2
Original line number Diff line number Diff line
@@ -213,10 +213,19 @@ If you can't trace NMI functions, then skip this option. 
<details to be filled>





HAVE_FTRACE_SYSCALLS

HAVE_SYSCALL_TRACEPOINTS

---------------------



<details to be filled>

You need very few things to get the syscalls tracing in an arch.



- Have a NR_syscalls variable in <asm/unistd.h> that provides the number

  of syscalls supported by the arch.

- Implement arch_syscall_addr() that resolves a syscall address from a

  syscall number.

- Support the TIF_SYSCALL_TRACEPOINT thread flags

- Put the trace_sys_enter() and trace_sys_exit() tracepoints calls from ptrace

  in the ptrace syscalls tracing path.

- Tag this arch as HAVE_SYSCALL_TRACEPOINTS.





HAVE_FTRACE_MCOUNT_RECORD