lkml.org 
[lkml]   [2009]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] tracing: Document HAVE_FTRACE_SYSCALLS needs
Date
Document the arch needed requirements to get the support for syscalls
tracing.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.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: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-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


\
 
 \ /
  Last update: 2009-09-19 07:41    [W:0.076 / U:0.428 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site