This change set replaces the function tracing recursion protection
with a context one, that keeps track of interrupts, NMIs, softirqs,
such that we do not need to disable interrupts and not miss any
events, as the old recursion protection had a race where interrupt
events could be dropped.
This also speeds up function tracing by 15% or more.
I'm posting these as a generic review of the changes I'll be pushing
into linux-next and will be pushing this for 3.9.
These patches have passed a series of tests I've run on few machines
with several different configs and such.
You can find the patches here. I'll add these to linux-next tomorrow.
-- Steve
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
tip/perf/core
Head SHA1: 0b07436d95b5404134da4d661fd183eac863513e
Steven Rostedt (12):
tracing: Remove trace.h header from trace_clock.c
tracing: Fix race with max_tr and changing tracers
tracing: Fix selftest function recursion accounting
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
ring-buffer: Remove trace.h from ring_buffer.c
----
kernel/trace/ftrace.c | 82 ++++++++++++++++---------
kernel/trace/ring_buffer.c | 88 ++++++++++++++++++--------
kernel/trace/trace.c | 29 ++++++---
kernel/trace/trace.h | 133 ++++++++++++++++++++++++++++++++++++----
kernel/trace/trace_clock.c | 2 -
kernel/trace/trace_functions.c | 61 +++++-------------
kernel/trace/trace_selftest.c | 19 ++----
7 files changed, 275 insertions(+), 139 deletions(-)
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