| 7d241ff0567b9503d79ee775c40927d09b509f83 |
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10-Dec-2009 |
Michal Simek <monstr@monstr.eu> |
microblaze: ftrace: Add dynamic trace support
With dynamic function tracer, by default, _mcount is defined as an
"empty" function, it returns directly without any more action. When
enabling it in user-space, it will jump to a real tracing
function(ftrace_caller), and do the real job for us.
Differ from the static function tracer, dynamic function tracer provides
two functions ftrace_make_call()/ftrace_make_nop() to enable/disable the
tracing of some indicated kernel functions(set_ftrace_filter).
In the kernel version, there is only one "_mcount" string for every
kernel function, so, we just need to match this one in mcount_regex of
scripts/recordmcount.pl.
For more information please look at code and Documentation/trace folder.
Steven ACK that scripts/recordmcount.pl part.
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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| 2fd7c761a24c28e83d7194b4b4a099451126a503 |
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16-Nov-2009 |
Michal Simek <monstr@monstr.eu> |
microblaze: ftrace: add static function tracer
If -pg of gcc is enabled with CONFIG_FUNCTION_TRACER=y. a calling to
_mcount will be inserted into each kernel function. so, there is a
possibility to trace the kernel functions in _mcount.
This patch add the specific _mcount support for static function
tracing. by default, ftrace_trace_function is initialized as
ftrace_stub(an empty function), so, the default _mcount will introduce
very little overhead. after enabling ftrace in user-space, it will jump
to a real tracing function and do static function tracing for us.
Commit message from Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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| 6c149fd7cda601ebd178dd2f07ccff6bb0d010cf |
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14-Apr-2009 |
Michal Simek <monstr@monstr.eu> |
microblaze: Add missing empty ftrace.h file
Signed-off-by: Michal Simek <monstr@monstr.eu>
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