In the past I've worked on tricks to make the function tracer a bit
faster. I've lowered the overhead by 18% which is quite an improvement.
Thus, instead of only taking 11x longer in the kernel, it takes 9x ;-)
Anyway, these are the latest patches to improve function tracing and
are pretty much good to go mainline. I just wanted to do one last
RFC post before pushing them forward.
-- Steve
These patches can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
rfc/function-preempt-only-v2
Head SHA1: bf9d25e084984439cb32c1fc7cb0f1936c95c51a
Steven Rostedt (8):
ftrace: Fix global function tracers that are not recursion safe
ftrace: Fix function tracing recursion self test
ftrace: Optimize the function tracer list loop
ftrace: Add context level recursion bit checking
tracing: Make the trace recursion bits into enums
tracing: Avoid unnecessary multiple recursion checks
ftrace: Use only the preempt version of function tracing
ring-buffer: User context bit recursion checking
----
kernel/trace/ftrace.c | 82 ++++++++++++++++---------
kernel/trace/ring_buffer.c | 85 +++++++++++++++++--------
kernel/trace/trace.h | 133 ++++++++++++++++++++++++++++++++++++----
kernel/trace/trace_functions.c | 61 +++++-------------
kernel/trace/trace_selftest.c | 3 +-
5 files changed, 248 insertions(+), 116 deletions(-)
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