Messages in this thread | | | Date | Sat, 19 Sep 2009 09:29:09 +0200 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 2/2] tracing: Document HAVE_FTRACE_SYSCALLS needs |
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On Sat, Sep 19, 2009 at 09:28:27AM +0200, Ingo Molnar wrote: > > * Frederic Weisbecker <fweisbec@gmail.com> wrote: > > > On Sat, Sep 19, 2009 at 09:17:12AM +0200, Ingo Molnar wrote: > > > > > > * Frederic Weisbecker <fweisbec@gmail.com> wrote: > > > > > > > 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_SYSCALLS is not actually used anywhere. > > > > > > Ingo > > > > Ah, that has been renamed HAVE_SYSCALL_TRACEPOINTS recently. What do > > you prefer? A delta patch or a rebase? > > We need the acks from Martin/Heiko so lets wait for that and do a new > tree then? > > Ingo
Ok.
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