Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759442AbZCPTkA (ORCPT ); Mon, 16 Mar 2009 15:40:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754494AbZCPTju (ORCPT ); Mon, 16 Mar 2009 15:39:50 -0400 Received: from mx2.redhat.com ([66.187.237.31]:37369 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752320AbZCPTju (ORCPT ); Mon, 16 Mar 2009 15:39:50 -0400 Date: Mon, 16 Mar 2009 15:38:40 -0400 From: Jason Baron To: Steven Rostedt Cc: mingo@elte.hu, linux-kernel@vger.kernel.org, acme@ghostprotocols.net, fweisbec@gmail.com, fche@redhat.com, peterz@infradead.org, compudj@krystal.dyndns.org Subject: Re: [Patch 2/2] tracepoints for softirq entry/exit - tracepoints Message-ID: <20090316193840.GC3111@redhat.com> References: <20090312183603.GC3352@redhat.com> <20090316190047.GB3111@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: 2670 Lines: 110 On Mon, Mar 16, 2009 at 03:17:09PM -0400, Steven Rostedt wrote: > memcpy isn't fast ;-) > > What you want is this: > > TP_STRUCT__entry( > __field( int, vec ) > ), > > TP_fast_assign( > __entry->vec = h - vec; definitely simplifies things! ok, re-spun patch again. use TRACE_EVENT to record the softirq vector number in the trace and then use the new softirq_to_name array to output the softirq vector name. Signed-off-by: Jason Baron --- include/trace/irq_event_types.h | 34 ++++++++++++++++++++++++++++++++++ kernel/softirq.c | 7 ++++++- 2 files changed, 40 insertions(+), 1 deletions(-) diff --git a/include/trace/irq_event_types.h b/include/trace/irq_event_types.h index 214bb92..acb8217 100644 --- a/include/trace/irq_event_types.h +++ b/include/trace/irq_event_types.h @@ -40,4 +40,38 @@ TRACE_EVENT(irq_handler_exit, __entry->irq, __entry->ret ? "handled" : "unhandled") ); +TRACE_EVENT(softirq_action_entry, + + TP_PROTO(struct softirq_action *h, struct softirq_action *vec), + + TP_ARGS(h, vec), + + TP_STRUCT__entry( + __field( int, vec ) + ), + + TP_fast_assign( + __entry->vec = h - vec; + ), + + TP_printk("softirq entry: %s", softirq_to_name[__entry->vec]) +); + +TRACE_EVENT(softirq_action_exit, + + TP_PROTO(struct softirq_action *h, struct softirq_action *vec), + + TP_ARGS(h, vec), + + TP_STRUCT__entry( + __field( int, vec ) + ), + + TP_fast_assign( + __entry->vec = h - vec; + ), + + TP_printk("softirq exit: %s", softirq_to_name[__entry->vec]) +); + #undef TRACE_SYSTEM diff --git a/kernel/softirq.c b/kernel/softirq.c index 8f3ae57..5e96c77 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -24,6 +24,7 @@ #include #include #include +#include #include /* @@ -185,6 +186,9 @@ EXPORT_SYMBOL(local_bh_enable_ip); */ #define MAX_SOFTIRQ_RESTART 10 +DEFINE_TRACE(softirq_action_entry); +DEFINE_TRACE(softirq_action_exit); + asmlinkage void __do_softirq(void) { struct softirq_action *h; @@ -211,8 +215,9 @@ restart: if (pending & 1) { int prev_count = preempt_count(); + trace_softirq_action_entry(h, softirq_vec); h->action(h); - + trace_softirq_action_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/