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authorFrederic Weisbecker <fweisbec@gmail.com>2009-09-19 07:14:15 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2009-10-14 09:54:38 +0200
commit459c6d15a0c52bae43842ff2cd0dd41aa7de9b7f (patch)
tree3eba2d9a08ae812924841c6a805ce3d58f0a7699 /Documentation/trace/ftrace-design.txt
parentc44fc770845163f8d9e573f37f92a7b7a7ade14e (diff)
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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: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Heiko 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>
Diffstat (limited to 'Documentation/trace/ftrace-design.txt')
-rw-r--r--Documentation/trace/ftrace-design.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/trace/ftrace-design.txt b/Documentation/trace/ftrace-design.txt
index 7003e10..641a1ef 100644
--- a/Documentation/trace/ftrace-design.txt
+++ b/Documentation/trace/ftrace-design.txt
@@ -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