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Date: Tue, 10 Oct 2017 18:19:12 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Joel Fernandes <joelaf@...gle.com>
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v8 1/2] tracing: Prepare to add preempt and irq trace
events
On Thu, 5 Oct 2017 17:54:31 -0700
Joel Fernandes <joelaf@...gle.com> wrote:
> In preparation of adding irqsoff and preemptsoff enable and disable trace
> events, move required functions and code to make it easier to add these events
> in a later patch. This patch is just code movement and no functional change.
New warning:
kernel/trace/trace_irqsoff.c:783:69: warning: 'tracing_irq_cpu' defined but not used [-Wunused-variable]
Looks pretty obvious what the fix is. Care to send a v9?
-- Steve
>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: kernel-team@...roid.com
> Signed-off-by: Joel Fernandes <joelaf@...gle.com>
> ---
> kernel/trace/trace_irqsoff.c | 100 ++++++++++++++++++++++++++++++++-----------
> 1 file changed, 74 insertions(+), 26 deletions(-)
>
> diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
> index 7758bc0617cb..0e3033c00474 100644
> --- a/kernel/trace/trace_irqsoff.c
> +++ b/kernel/trace/trace_irqsoff.c
> @@ -16,6 +16,7 @@
>
> #include "trace.h"
>
> +#if defined(CONFIG_IRQSOFF_TRACER) || defined(CONFIG_PREEMPT_TRACER)
> static struct trace_array *irqsoff_trace __read_mostly;
> static int tracer_enabled __read_mostly;
>
> @@ -462,64 +463,44 @@ void time_hardirqs_off(unsigned long a0, unsigned long a1)
>
> #else /* !CONFIG_PROVE_LOCKING */
>
> -/*
> - * Stubs:
> - */
> -
> -void trace_softirqs_on(unsigned long ip)
> -{
> -}
> -
> -void trace_softirqs_off(unsigned long ip)
> -{
> -}
> -
> -inline void print_irqtrace_events(struct task_struct *curr)
> -{
> -}
> -
> /*
> * We are only interested in hardirq on/off events:
> */
> -void trace_hardirqs_on(void)
> +static inline void tracer_hardirqs_on(void)
> {
> if (!preempt_trace() && irq_trace())
> stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
> }
> -EXPORT_SYMBOL(trace_hardirqs_on);
>
> -void trace_hardirqs_off(void)
> +static inline void tracer_hardirqs_off(void)
> {
> if (!preempt_trace() && irq_trace())
> start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
> }
> -EXPORT_SYMBOL(trace_hardirqs_off);
>
> -__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
> +static inline void tracer_hardirqs_on_caller(unsigned long caller_addr)
> {
> if (!preempt_trace() && irq_trace())
> stop_critical_timing(CALLER_ADDR0, caller_addr);
> }
> -EXPORT_SYMBOL(trace_hardirqs_on_caller);
>
> -__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
> +static inline void tracer_hardirqs_off_caller(unsigned long caller_addr)
> {
> if (!preempt_trace() && irq_trace())
> start_critical_timing(CALLER_ADDR0, caller_addr);
> }
> -EXPORT_SYMBOL(trace_hardirqs_off_caller);
>
> #endif /* CONFIG_PROVE_LOCKING */
> #endif /* CONFIG_IRQSOFF_TRACER */
>
> #ifdef CONFIG_PREEMPT_TRACER
> -void trace_preempt_on(unsigned long a0, unsigned long a1)
> +static inline void tracer_preempt_on(unsigned long a0, unsigned long a1)
> {
> if (preempt_trace() && !irq_trace())
> stop_critical_timing(a0, a1);
> }
>
> -void trace_preempt_off(unsigned long a0, unsigned long a1)
> +static inline void tracer_preempt_off(unsigned long a0, unsigned long a1)
> {
> if (preempt_trace() && !irq_trace())
> start_critical_timing(a0, a1);
> @@ -781,3 +762,70 @@ __init static int init_irqsoff_tracer(void)
> return 0;
> }
> core_initcall(init_irqsoff_tracer);
> +#endif /* IRQSOFF_TRACER || PREEMPTOFF_TRACER */
> +
> +#ifndef CONFIG_IRQSOFF_TRACER
> +static inline void tracer_hardirqs_on(void) { }
> +static inline void tracer_hardirqs_off(void) { }
> +static inline void tracer_hardirqs_on_caller(unsigned long caller_addr) { }
> +static inline void tracer_hardirqs_off_caller(unsigned long caller_addr) { }
> +#endif
> +
> +#ifndef CONFIG_PREEMPT_TRACER
> +static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
> +static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
> +#endif
> +
> +#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PROVE_LOCKING)
> +void trace_hardirqs_on(void)
> +{
> + tracer_hardirqs_on();
> +}
> +EXPORT_SYMBOL(trace_hardirqs_on);
> +
> +void trace_hardirqs_off(void)
> +{
> + tracer_hardirqs_off();
> +}
> +EXPORT_SYMBOL(trace_hardirqs_off);
> +
> +__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
> +{
> + tracer_hardirqs_on_caller(caller_addr);
> +}
> +EXPORT_SYMBOL(trace_hardirqs_on_caller);
> +
> +__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
> +{
> + tracer_hardirqs_off_caller(caller_addr);
> +}
> +EXPORT_SYMBOL(trace_hardirqs_off_caller);
> +
> +/*
> + * Stubs:
> + */
> +
> +void trace_softirqs_on(unsigned long ip)
> +{
> +}
> +
> +void trace_softirqs_off(unsigned long ip)
> +{
> +}
> +
> +inline void print_irqtrace_events(struct task_struct *curr)
> +{
> +}
> +#endif
> +
> +#ifdef CONFIG_PREEMPT_TRACER
> +void trace_preempt_on(unsigned long a0, unsigned long a1)
> +{
> + tracer_preempt_on(a0, a1);
> +}
> +
> +void trace_preempt_off(unsigned long a0, unsigned long a1)
> +{
> + tracer_preempt_off(a0, a1);
> +}
> +#endif
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