Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756941AbZCLSiS (ORCPT ); Thu, 12 Mar 2009 14:38:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753052AbZCLSiD (ORCPT ); Thu, 12 Mar 2009 14:38:03 -0400 Received: from mx2.redhat.com ([66.187.237.31]:39227 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752304AbZCLSiB (ORCPT ); Thu, 12 Mar 2009 14:38:01 -0400 Date: Thu, 12 Mar 2009 14:36:03 -0400 From: Jason Baron To: mingo@elte.hu, rostedt@goodmis.org Cc: linux-kernel@vger.kernel.org, acme@ghostprotocols.net, fweisbec@gmail.com, fche@redhat.com, peterz@infradead.org, compudj@krystal.dyndns.org Subject: [Patch 2/2] tracepoints for softirq entry/exit - tracepoints Message-ID: <20090312183603.GC3352@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2143 Lines: 73 introduce softirq entry/exit tracepoints. These are useful for augmenting existing tracers, and to figure out softirq frequencies and timings. Signed-off-by: Jason Baron --- 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..38b4bdd 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(irq_softirq_entry, + TP_PROTO(struct softirq_action *h, struct softirq_action *vec), + TP_ARGS(h, vec), + TP_FMT("softirq=%d action=%s", h - vec, softirq_to_name[h-vec]) + ); + +TRACE_FORMAT(irq_softirq_exit, + TP_PROTO(struct softirq_action *h, struct softirq_action *vec), + TP_ARGS(h, vec), + TP_FMT("softirq=%d action=%s", h - vec, softirq_to_name[h-vec]) + ); + #undef TRACE_SYSTEM diff --git a/kernel/softirq.c b/kernel/softirq.c index ba1511f..c378d53 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -24,6 +24,7 @@ #include #include #include +#include #include /* @@ -186,6 +187,9 @@ EXPORT_SYMBOL(local_bh_enable_ip); */ #define MAX_SOFTIRQ_RESTART 10 +DEFINE_TRACE(irq_softirq_entry); +DEFINE_TRACE(irq_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_irq_softirq_entry(h, softirq_vec); h->action(h); - + trace_irq_softirq_exit(h, softirq_vec); if (unlikely(prev_count != preempt_count())) { printk(KERN_ERR "huh, entered softirq %td %s %p" "with preempt_count %08x," -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/