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| author | Jason Baron <jbaron@redhat.com> | 2009-03-12 14:36:03 -0400 |
|---|---|---|
| committer | Steven Rostedt <srostedt@redhat.com> | 2009-03-12 21:20:58 -0400 |
| commit | 39842323ceb368d2ea36ab7696aedbe296e13b61 (patch) | |
| tree | 6050a0e282eaaf500f3809b1e53256b24b570d92 /kernel/softirq.c | |
| parent | 5d592b44b29a1d73e13d5c9e3426eed843bdc359 (diff) | |
| download | linux-39842323ceb368d2ea36ab7696aedbe296e13b61.tar.gz linux-39842323ceb368d2ea36ab7696aedbe296e13b61.tar.bz2 linux-39842323ceb368d2ea36ab7696aedbe296e13b61.zip | |
tracing: tracepoints for softirq entry/exit - tracepoints
Introduce softirq entry/exit tracepoints. These are useful for
augmenting existing tracers, and to figure out softirq frequencies and
timings.
[
s/irq_softirq_/softirq_/ for trace point names and
Fixed printf format in TRACE_FORMAT macro
- Steven Rostedt
]
LKML-Reference: <20090312183603.GC3352@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'kernel/softirq.c')
| -rw-r--r-- | kernel/softirq.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c index 9f90fdc039f4..a5e81231ca7a 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -24,6 +24,7 @@ #include <linux/ftrace.h> #include <linux/smp.h> #include <linux/tick.h> +#include <trace/irq.h> #include <asm/irq.h> /* @@ -186,6 +187,9 @@ EXPORT_SYMBOL(local_bh_enable_ip); */ #define MAX_SOFTIRQ_RESTART 10 +DEFINE_TRACE(softirq_entry); +DEFINE_TRACE(softirq_exit); + asmlinkage void __do_softirq(void) { struct softirq_action *h; @@ -212,8 +216,9 @@ restart: if (pending & 1) { int prev_count = preempt_count(); + trace_softirq_entry(h, softirq_vec); h->action(h); - + trace_softirq_exit(h, softirq_vec); if (unlikely(prev_count != preempt_count())) { printk(KERN_ERR "huh, entered softirq %td %s %p" "with preempt_count %08x," |