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Subject[PATCH RFC v4 0/3] tracing: Add trace events for preemption and irq disable/enable.
These patches add trace events support for preempt and irq disable/enable

Changes since v3 (link [1]):
Previously the patch series used the terms "critical section" but Peter
suggested that this name is confusing due to ambiguity, so I dropped calling it
that in this series. See discussion in [1]. I also dropped the "preemptirq"
combined event (which behaves similar to the preemptirqsoff tracer) for now and
will keep that for a later patch once we can get this foundation series in.

Here's an example of how Android's systrace will be using it to show atomic
sections as a gantt chart:

I also added a slightly unrelated fix for a config option (patch 3/3).


Joel Fernandes (3):
trace/irqsoff: Prepare to add preempt and irq trace events
trace: Add support for preempt and irq enable/disable events
ftrace: Use correct config option for preemption debug

include/linux/ftrace.h | 7 +-
include/linux/irqflags.h | 4 +-
include/trace/events/preemptirq.h | 62 +++++++++++++
kernel/trace/Kconfig | 9 ++
kernel/trace/Makefile | 1 +
kernel/trace/trace_irqsoff.c | 178 +++++++++++++++++++++++++++++++-------
6 files changed, 226 insertions(+), 35 deletions(-)
create mode 100644 include/trace/events/preemptirq.h

Cc: Steven Rostedt <>
Cc: Peter Zijlstra <>

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