linux-kernel - Re: [PATCH 2/2] Markers Implementation for Preempt RCU Boost Tracing

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Date:	Thu, 3 Jan 2008 11:30:55 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	"K. Prasad" <prasad@...ux.vnet.ibm.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org, dipankar@...ibm.com,
	ego@...ibm.com, paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH 2/2] Markers Implementation for Preempt RCU Boost
	Tracing

* K. Prasad (prasad@...ux.vnet.ibm.com) wrote:
> This patch converts the tracing mechanism of Preempt RCU boosting into
> markers. The handler functions for these markers are included inside
> rcupreempt_trace.c and will be included only when PREEMPT_RCU_BOOST is
> chosen.
>  
> Signed-off-by: K.Prasad <prasad@...ux.vnet.ibm.com>
> ---
>  include/linux/rcupreempt_trace.h |   46 ++++++++
>  kernel/rcupreempt-boost.c        |  211 ++++-----------------------------------
>  kernel/rcupreempt_trace.c        |  183 +++++++++++++++++++++++++++++++++
>  3 files changed, 251 insertions(+), 189 deletions(-)
>  
> Index: linux-2.6.24-rc2-rt1.MARKER_PATCHES_NEW/include/linux/rcupreempt_trace.h
> ===================================================================
> --- linux-2.6.24-rc2-rt1.MARKER_PATCHES_NEW.orig/include/linux/rcupreempt_trace.h
> +++ linux-2.6.24-rc2-rt1.MARKER_PATCHES_NEW/include/linux/rcupreempt_trace.h
> @@ -102,5 +102,51 @@ extern int rcupreempt_flip_flag(int cpu)
>  extern int rcupreempt_mb_flag(int cpu);
>  extern char *rcupreempt_try_flip_state_name(void);
>  
> +#ifdef CONFIG_PREEMPT_RCU_BOOST
> +struct preempt_rcu_boost_trace {
> +	unsigned long rbs_stat_task_boost_called;
> +	unsigned long rbs_stat_task_boosted;
> +	unsigned long rbs_stat_boost_called;
> +	unsigned long rbs_stat_try_boost;
> +	unsigned long rbs_stat_boosted;
> +	unsigned long rbs_stat_unboost_called;
> +	unsigned long rbs_stat_unboosted;
> +	unsigned long rbs_stat_try_boost_readers;
> +	unsigned long rbs_stat_boost_readers;
> +	unsigned long rbs_stat_try_unboost_readers;
> +	unsigned long rbs_stat_unboost_readers;
> +	unsigned long rbs_stat_over_taken;
> +};
> +
> +#define DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(preempt_rcu_boost_var) \
> +void preempt_rcu_boost_var##_callback(const struct marker *mdata, \
> +				void *private_data, const char *format, ...) \
> +{ \
> +	va_list ap; \
> +	int cpu; \
> +	struct preempt_rcu_boost_trace *boost_trace; \
> +	va_start(ap, format); \
> +	cpu = va_arg(ap, typeof(unsigned int)); \

(sorry for late response, I just came back from vacation)

Instead of passing the cpu id as a marker parameter, why don't you
simply use smp_processor_id() right here ?

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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