Integrate ft_irq_fired() with Linux

This patch hooks up Feather-Trace's ft_irq_fired() handler with
Linux's interrupt handling infrastructure.

2 files changed, 8 insertions, 0 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 123673291ffb..f286554e3395 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1550,7 +1550,12 @@ void scheduler_ipi(void)
         preempt_fold_need_resched();
 
         if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick())
+        {
+                /* If we don't call irq_enter(), we need to triggger the IRQ
+                 * tracing manually. */
+                ft_irq_fired();
                 return;
+        }
 
         /*
          * Not all reschedule IPI handlers call irq_enter/irq_exit, since
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 479e4436f787..99fe8b877e53 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -244,6 +244,9 @@ asmlinkage __visible void __do_softirq(void)
          */
         current->flags &= ~PF_MEMALLOC;
 
+        /* Mark Feather-Trace samples as "disturbed". */
+        ft_irq_fired();
+
         pending = local_softirq_pending();
         account_irq_enter_time(current);