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| author | Steven Rostedt <srostedt@redhat.com> | 2012-11-01 20:54:21 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-11-02 10:21:52 -0400 |
| commit | 0d5c6e1c19bab82fad4837108c2902f557d62a04 (patch) | |
| tree | ed075db499735ea4d72b9d9d7f992fe7d9a1a328 /kernel/trace/trace.h | |
| parent | 02404baf1b47123f1c88c9f9f1f3b00e1e2b10db (diff) | |
| download | linux-0d5c6e1c19bab82fad4837108c2902f557d62a04.tar.gz linux-0d5c6e1c19bab82fad4837108c2902f557d62a04.tar.bz2 linux-0d5c6e1c19bab82fad4837108c2902f557d62a04.zip | |
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 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 3e8a176f64e6..55010ed175f0 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -327,7 +327,6 @@ trace_buffer_iter(struct trace_iterator *iter, int cpu) int tracer_init(struct tracer *t, struct trace_array *tr); int tracing_is_enabled(void); -void trace_wake_up(void); void tracing_reset(struct trace_array *tr, int cpu); void tracing_reset_online_cpus(struct trace_array *tr); void tracing_reset_current(int cpu); @@ -349,9 +348,6 @@ trace_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long len, unsigned long flags, int pc); -void trace_buffer_unlock_commit(struct ring_buffer *buffer, - struct ring_buffer_event *event, - unsigned long flags, int pc); struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data); @@ -370,7 +366,6 @@ void trace_init_global_iter(struct trace_iterator *iter); void tracing_iter_reset(struct trace_iterator *iter, int cpu); -void default_wait_pipe(struct trace_iterator *iter); void poll_wait_pipe(struct trace_iterator *iter); void ftrace(struct trace_array *tr, |