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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-07-01 15:58:24 -0400
committerSteven Rostedt <rostedt@goodmis.org>2013-07-01 20:34:28 -0400
commit10246fa35d4ffdfe472185d4cbf9c2dfd9a9f023 (patch)
tree277cb4041486bfe87730fd767b2a8072330211b9 /kernel/trace/trace_irqsoff.c
parentb04d52e368e2cf526abb2bab61f304eaea126af2 (diff)
downloadlinux-10246fa35d4ffdfe472185d4cbf9c2dfd9a9f023.tar.bz2
tracing: Use flag buffer_disabled for irqsoff tracer
If the ring buffer is disabled and the irqsoff tracer records a trace it will clear out its buffer and lose the data it had previously recorded. Currently there's a callback when writing to the tracing_of file, but if tracing is disabled via the function tracer trigger, it will not inform the irqsoff tracer to stop recording. By using the "mirror" flag (buffer_disabled) in the trace_array, that keeps track of the status of the trace_array's buffer, it gives the irqsoff tracer a fast way to know if it should record a new trace or not. The flag may be a little behind the real state of the buffer, but it should not affect the trace too much. It's more important for the irqsoff tracer to be fast. Reported-by: Dave Jones <davej@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_irqsoff.c')
-rw-r--r--kernel/trace/trace_irqsoff.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index b19d065a28cb..2aefbee93a6d 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -373,7 +373,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
struct trace_array_cpu *data;
unsigned long flags;
- if (likely(!tracer_enabled))
+ if (!tracer_enabled || !tracing_is_enabled())
return;
cpu = raw_smp_processor_id();
@@ -416,7 +416,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
else
return;
- if (!tracer_enabled)
+ if (!tracer_enabled || !tracing_is_enabled())
return;
data = per_cpu_ptr(tr->trace_buffer.data, cpu);