linux-kernel - [PATCH 2/2] tracing: Document HAVE_FTRACE

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Date:	Sat, 19 Sep 2009 07:39:17 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: [PATCH 2/2] tracing: Document HAVE_FTRACE_SYSCALLS needs

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

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Jason Baron <jbaron@...hat.com>
Cc: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Paul Mundt <lethal@...ux-sh.org>
---
 Documentation/trace/ftrace-design.txt |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/Documentation/trace/ftrace-design.txt b/Documentation/trace/ftrace-design.txt
index 7003e10..04ab61c 100644
--- a/Documentation/trace/ftrace-design.txt
+++ b/Documentation/trace/ftrace-design.txt
@@ -216,7 +216,16 @@ If you can't trace NMI functions, then skip this option.
 HAVE_FTRACE_SYSCALLS
 ---------------------
 
-<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_FTRACE_SYSCALLS.
 
 
 HAVE_FTRACE_MCOUNT_RECORD
-- 
1.6.2.3

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