Feather-Trace: keep track of interrupt-related interference.2012.1

Increment a processor-local counter whenever an interrupt is handled.
This allows Feather-Trace to include a (truncated) counter and a flag
to report interference from interrupts. This could be used to filter
samples that were disturbed by interrupts.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
index ba362171e8ae..e6dd5a456bae 100644
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -6,6 +6,8 @@
 #include <linux/ftrace_irq.h>
 #include <asm/hardirq.h>
 
+#include <litmus/trace_irq.h>
+
 /*
  * We put the hardirq and softirq counter into the preemption
  * counter. The bitmask has the following meaning:
@@ -186,6 +188,7 @@ extern void rcu_nmi_exit(void);
                 account_system_vtime(current);          \
                 add_preempt_count(HARDIRQ_OFFSET);      \
                 trace_hardirq_enter();                  \
+                ft_irq_fired();                         \
         } while (0)
 
 /*
@@ -216,6 +219,7 @@ extern void irq_exit(void);
                 lockdep_off();                                  \
                 rcu_nmi_enter();                                \
                 trace_hardirq_enter();                          \
+                ft_irq_fired();                                 \
         } while (0)
 
 #define nmi_exit()                                              \