These patches add critical section event tracing support. Changes since RFC [1] are: - Make critical events independent of the preempt/irqsoff tracer. - Store pointers instead of symbol names to do less in the fast path. - Other changes based on Steven's comments.
Here's an example of how Android's systrace will be using it to show critical sections as a gantt chart: http://imgur.com/download/TZplEVp [1] https://patchwork.kernel.org/patch/9676579/ Joel Fernandes (2): tracing: irqsoff: Move code under tracer config options tracing: Add support for critical section events include/linux/ftrace.h | 2 +- include/linux/irqflags.h | 3 +- include/trace/events/critical.h | 45 ++++++ kernel/trace/Kconfig | 5 + kernel/trace/Makefile | 1 + kernel/trace/trace_irqsoff.c | 331 ++++++++++++++++++++++++++-------------- 6 files changed, 269 insertions(+), 118 deletions(-) create mode 100644 include/trace/events/critical.h Cc: Steven Rostedt <rost...@goodmis.org> Cc: kernel-t...@android.com -- 2.14.1.581.gf28d330327-goog
