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SubjectRe: [PATCH 00/15] [git pull] for tip/tracing/ftrace
On Tue, Feb 17, 2009 at 12:12:27AM -0500, Steven Rostedt wrote:
>
> Ingo,
>
> This is a patch series that offers a variety of features.
>
> The first is to add:
>
> #### all functions enabled ####
>
> to set_ftrace_filter when all functions will be traced when function
> tracing is on.
>
> The next is to add a :command: interface, and the module command:
>
> echo '*:mod:ext4' > set_ftrace_filter
>
> Will select all functions in the ext4 module.
>
> echo '!*write*:mod:ext4' > set_ftrace_filter
>
> will remove all functions with the characters 'write' and are
> in ext4.
>
> Next we extend the :command: interface as well as add a way to
> hook tracers to specific functions. Instead of tracing all functions
> the same, this patch series adds a hash to be able to trace different
> functions differently.
>
> I implement a 'traceon' and 'traceoff' to have a function start or
> stop tracing when it is hit. It also includes a counter for the
> number of times to implement the trace on/off.
>
> echo '*_lock:traceon:4' > set_ftrace_filter
> echo '*_unlock:traceoff:5' > set_ftrace_filter

That's great!
I guess it could be useful to be able to pass it as a kernel parameter.
Something like that ftrace=function_tracer ftrace_filter='*_lock:traceon:4'


> This will have all functions that end with _lock turn on tracing
> and all that end with _unlock disable it, 4 times each.
>
> The following patches are in:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
>
> branch: tip/tracing/ftrace
>
>
> Steven Rostedt (15):
> ftrace: state that all functions are enabled in set_ftrace_filter
> ftrace: add do_for_each_ftrace_rec and while_for_each_ftrace_rec
> ftrace: rename ftrace_match to ftrace_match_records
> ftrace: break up ftrace_match_records into smaller components
> ftrace: add module command function filter selection
> ftrace: enable filtering only when a function is filtered on
> ftrace: add command interface for function selection
> ftrace: convert ftrace_lock from a spinlock to mutex
> ftrace: consolidate mutexes
> ftrace: trace different functions with a different tracer
> ring-buffer: add tracing_is_on to test if ring buffer is enabled
> ftrace: add traceon traceoff commands to enable/disable the buffers
> ftrace: show selected functions in set_ftrace_filter
> ftrace: add pretty print to selected fuction traces
> ftrace: add pretty print function for traceon and traceoff hooks
>
> ----
> include/linux/ftrace.h | 40 ++
> include/linux/ring_buffer.h | 2 +
> kernel/trace/ftrace.c | 929 +++++++++++++++++++++++++++++++---------
> kernel/trace/ring_buffer.c | 9 +
> kernel/trace/trace_functions.c | 163 +++++++
> 5 files changed, 946 insertions(+), 197 deletions(-)
> --



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