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    SubjectRe: [PATCH 2/2] tracing: Document HAVE_FTRACE_SYSCALLS needs

    * 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


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