tracing: tracepoints for softirq entry/exit - add softirq-to-name array
Create a 'softirq_to_name' array, which is indexed by softirq #, so
that we can easily convert between the softirq index # and its name, in
order to get more meaningful output messages.
LKML-Reference: <20090312183336.GB3352@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 7571bcb..9f90fdc 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -53,6 +53,12 @@
static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
+char *softirq_to_name[NR_SOFTIRQS] = {
+ "HI_SOFTIRQ", "TIMER_SOFTIRQ", "NET_TX_SOFTIRQ", "NET_RX_SOFTIRQ",
+ "BLOCK_SOFTIRQ", "TASKLET_SOFTIRQ", "SCHED_SOFTIRQ", "HRTIMER_SOFTIRQ",
+ "RCU_SOFTIRQ"
+};
+
/*
* we cannot loop indefinitely here to avoid userspace starvation,
* but we also don't want to introduce a worst case 1/HZ latency
@@ -209,9 +215,10 @@
h->action(h);
if (unlikely(prev_count != preempt_count())) {
- printk(KERN_ERR "huh, entered softirq %td %p"
+ printk(KERN_ERR "huh, entered softirq %td %s %p"
"with preempt_count %08x,"
" exited with %08x?\n", h - softirq_vec,
+ softirq_to_name[h - softirq_vec],
h->action, prev_count, preempt_count());
preempt_count() = prev_count;
}