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Message-ID: <20090217142414.GA5888@nowhere> Date: Tue, 17 Feb 2009 15:24:15 +0100 From: Frederic Weisbecker <fweisbec@...il.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: [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(-) > -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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