linux-kernel - Re: [PATCH 19/20 -v5] Trace irq disabled critical timings

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Date:	Wed, 23 Jan 2008 11:53:53 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Bird <tim.bird@...sony.com>,
	Sam Ravnborg <sam@...nborg.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	John Stultz <johnstul@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 19/20 -v5] Trace irq disabled critical timings

On Wed, Jan 23, 2008 at 11:02:55AM -0500, Steven Rostedt wrote:
> This patch adds latency tracing for critical timings
> (how long interrupts are disabled for).
> 
>  "irqsoff" is added to /debugfs/tracing/available_tracers
> 

> Index: linux-mcount.git/kernel/lockdep.c
> ===================================================================
> --- linux-mcount.git.orig/kernel/lockdep.c	2008-01-23 10:26:11.000000000 -0500
> +++ linux-mcount.git/kernel/lockdep.c	2008-01-23 10:27:53.000000000 -0500
> @@ -39,6 +39,7 @@
>  #include <linux/irqflags.h>
>  #include <linux/utsname.h>
>  #include <linux/hash.h>
> +#include <linux/mcount.h>
>  
>  #include <asm/sections.h>
>  
> @@ -2009,7 +2010,7 @@ void early_boot_irqs_on(void)
>  /*
>   * Hardirqs will be enabled:
>   */
> -void trace_hardirqs_on(void)
> +void notrace trace_hardirqs_on_caller(unsigned long a0)
>  {
>  	struct task_struct *curr = current;
>  	unsigned long ip;
> @@ -2050,14 +2051,24 @@ void trace_hardirqs_on(void)
>  	curr->hardirq_enable_ip = ip;
>  	curr->hardirq_enable_event = ++curr->irq_events;
>  	debug_atomic_inc(&hardirqs_on_events);
> +	time_hardirqs_on(CALLER_ADDR0, a0);
>  }
> +EXPORT_SYMBOL(trace_hardirqs_on_caller);
>  
> +void notrace trace_hardirqs_on(void) {
> +	trace_hardirqs_on_caller(CALLER_ADDR0);
> +}
>  EXPORT_SYMBOL(trace_hardirqs_on);
>  

vvvvvvvvvvvvvvvv

> +void notrace trace_hardirqs_off(void) {
> +	trace_hardirqs_off_caller(CALLER_ADDR0);
> +}
> +EXPORT_SYMBOL(trace_hardirqs_off);
> +

^^^^^^^^^^^^^^^^

>  /*
>   * Hardirqs were disabled:
>   */
> -void trace_hardirqs_off(void)
> +void notrace trace_hardirqs_off_caller(unsigned long a0)
>  {
>  	struct task_struct *curr = current;
>  
> @@ -2075,10 +2086,15 @@ void trace_hardirqs_off(void)
>  		curr->hardirq_disable_ip = _RET_IP_;
>  		curr->hardirq_disable_event = ++curr->irq_events;
>  		debug_atomic_inc(&hardirqs_off_events);
> +		time_hardirqs_off(CALLER_ADDR0, a0);
>  	} else
>  		debug_atomic_inc(&redundant_hardirqs_off);
>  }
>  


> +void notrace trace_hardirqs_off(void) {
> +	trace_hardirqs_off_caller(CALLER_ADDR0);
> +}
> +
>  EXPORT_SYMBOL(trace_hardirqs_off);
> 


Bah, I didn't refresh quilt! I'll update the website with a -v5a with
this fix.

-- Steve

>  /*
--
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