Messages in this thread Patch in this message | | | Date | Fri, 13 Mar 2009 04:03:06 GMT | From | Jason Baron <> | Subject | [tip:tracing/ftrace] tracing: tracepoints for softirq entry/exit - tracepoints |
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Commit-ID: 39842323ceb368d2ea36ab7696aedbe296e13b61 Gitweb: http://git.kernel.org/tip/39842323ceb368d2ea36ab7696aedbe296e13b61 Author: Jason Baron <jbaron@redhat.com> AuthorDate: Thu, 12 Mar 2009 14:36:03 -0400 Commit: Steven Rostedt <srostedt@redhat.com> CommitDate: Thu, 12 Mar 2009 21:20:58 -0400
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>
--- include/trace/irq_event_types.h | 12 ++++++++++++ kernel/softirq.c | 7 ++++++- 2 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/include/trace/irq_event_types.h b/include/trace/irq_event_types.h index 214bb92..85964eb 100644 --- a/include/trace/irq_event_types.h +++ b/include/trace/irq_event_types.h @@ -40,4 +40,16 @@ TRACE_EVENT(irq_handler_exit, __entry->irq, __entry->ret ? "handled" : "unhandled") ); +TRACE_FORMAT(softirq_entry, + TP_PROTO(struct softirq_action *h, struct softirq_action *vec), + TP_ARGS(h, vec), + TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec]) + ); + +TRACE_FORMAT(softirq_exit, + TP_PROTO(struct softirq_action *h, struct softirq_action *vec), + TP_ARGS(h, vec), + TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec]) + ); + #undef TRACE_SYSTEM diff --git a/kernel/softirq.c b/kernel/softirq.c index 9f90fdc..a5e8123 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,"
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