path: root/include/trace/ftrace.h
diff options
authorSteven Rostedt <srostedt@redhat.com>2012-11-01 20:54:21 -0400
committerSteven Rostedt <rostedt@goodmis.org>2012-11-02 10:21:52 -0400
commit0d5c6e1c19bab82fad4837108c2902f557d62a04 (patch)
treeed075db499735ea4d72b9d9d7f992fe7d9a1a328 /include/trace/ftrace.h
parent02404baf1b47123f1c88c9f9f1f3b00e1e2b10db (diff)
tracing: Use irq_work for wake ups and remove *_nowake_*() functions
Have the ring buffer commit function use the irq_work infrastructure to wake up any waiters waiting on the ring buffer for new data. The irq_work was created for such a purpose, where doing the actual wake up at the time of adding data is too dangerous, as an event or function trace may be in the midst of the work queue locks and cause deadlocks. The irq_work will either delay the action to the next timer interrupt, or trigger an IPI to itself forcing an interrupt to do the work (in a safe location). With irq_work, all ring buffer commits can safely do wakeups, removing the need for the ring buffer commit "nowake" variants, which were used by events and function tracing. All commits can now safely use the normal commit, and the "nowake" variants can be removed. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/trace/ftrace.h')
1 files changed, 1 insertions, 2 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index a763888a36f9..698f2a890322 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -545,8 +545,7 @@ ftrace_raw_event_##call(void *__data, proto) \
{ assign; } \
if (!filter_current_check_discard(buffer, event_call, entry, event)) \
- trace_nowake_buffer_unlock_commit(buffer, \
- event, irq_flags, pc); \
+ trace_buffer_unlock_commit(buffer, event, irq_flags, pc); \
* The ftrace_test_probe is compiled out, it is only here as a build time check

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