From mboxrd@z Thu Jan  1 00:00:00 1970
From: ajitrzid@yahoo.com (Ajit R)
Date: Tue, 4 Aug 2009 06:22:53 -0700 (PDT)
Subject: [ltt-dev] User Space tracing on ARM 2.6.23
Message-ID: <305625.28501.qm@web63201.mail.re1.yahoo.com>


Hi 
  My config is the following:
Architecture:     ARM11 MPCORE  Uniprocessor
Lttv version:     0.10.0-pre1
LTTng version:    0.10.0-pre5
LTT Control:      0.45
kernel version:   2.6.23.1

applied the userspace patches. Compilation errors in "ltt-syscall.c"

 ltt_reserve_slot(trace, channel, &transport_data, reserve_size, &slot_size, &tsc)

has to be:

ltt_reserve_slot(trace, channel, &transport_data, reserve_size, &slot_size, &tsc,cpu);

and

trace->ops->user_errors(trace, index, data_size, &dbg);
which has to be
trace->ops->user_errors(trace, index, data_size, &dbg,cpu);

Added this to get cpu after preempt_disable() -->

cpu = smp_processor_id();


I can see sys_ltt_trace and sys_register_markers in "/proc/kallsyms" after compilation.

From: ltt-syscall.c
/*
 * TODO: ONLY permit userspace markers to write in userspace channels.
 */
asmlinkage long sys_register_markers(const struct user_markers *begin,
        const struct user_markers *end)
{
}



Seems like register_markers does nothing with the system call.
Are there any examples on howto use the older userspace tracing anywhere: register_markers and ltt_trace ?

Thanks
Ajit