linux-kernel - Re: [PATCH 2/3] perf: add OMAP support for the new power events

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Date:	Tue, 4 Jan 2011 11:48:53 -0700 (MST)
From:	Paul Walmsley <paul@...an.com>
To:	jean.pihet@...oldbits.com
cc:	mingo@...e.hu, trenn@...e.de,
	Kevin Hilman <khilman@...prootsystems.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-perf-users@...r.kernel.org, rjw@...k.pl,
	Jean Pihet <j-pihet@...com>
Subject: Re: [PATCH 2/3] perf: add OMAP support for the new power events

Hello Jean,

On Tue, 4 Jan 2011, jean.pihet@...oldbits.com wrote:

> From: Jean Pihet <j-pihet@...com>
> 
> The patch adds the new power management trace points for
> the OMAP architecture.
> 
> The trace points are for:
> - default idle handler. Since the cpuidle framework is
>   instrumented in the generic way there is no need to
>   add trace points in the OMAP specific cpuidle handler;
> - cpufreq (DVFS),
> - clocks changes (enable, disable, set_rate),

A question about these.  Are these only meant to track calls to these 
functions from outside the clock code?  Or meant to track actual hardware 
clock changes?  If the latter, then it might make sense to put these 
trace points into the functions that actually change the hardware 
registers, e.g., omap2_dflt_clk_{enable,disable}(), etc., since a 
clk_enable() on a leaf clock may result in many internal system clocks 
being enabled up the clock tree.


- Paul

> - change of power domains next power states.
> 
> Signed-off-by: Jean Pihet <j-pihet@...com>
> ---
>  arch/arm/mach-omap2/pm34xx.c      |    7 +++++++
>  arch/arm/mach-omap2/powerdomain.c |    3 +++
>  arch/arm/plat-omap/clock.c        |   13 ++++++++++---
>  3 files changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 0ec8a04..0ee0b0e 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -29,6 +29,7 @@
>  #include <linux/delay.h>
>  #include <linux/slab.h>
>  #include <linux/console.h>
> +#include <trace/events/power.h>
>  
>  #include <plat/sram.h>
>  #include <plat/clockdomain.h>
> @@ -506,8 +507,14 @@ static void omap3_pm_idle(void)
>  	if (omap_irq_pending() || need_resched())
>  		goto out;
>  
> +	trace_power_start(POWER_CSTATE, 1, smp_processor_id());
> +	trace_cpu_idle(1, smp_processor_id());
> +
>  	omap_sram_idle();
>  
> +	trace_power_end(smp_processor_id());
> +	trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
> +
>  out:
>  	local_fiq_enable();
>  	local_irq_enable();
> diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
> index 6527ec3..73cbe9a 100644
> --- a/arch/arm/mach-omap2/powerdomain.c
> +++ b/arch/arm/mach-omap2/powerdomain.c
> @@ -23,6 +23,7 @@
>  #include <linux/errno.h>
>  #include <linux/err.h>
>  #include <linux/io.h>
> +#include <trace/events/power.h>
>  
>  #include <asm/atomic.h>
>  
> @@ -440,6 +441,8 @@ int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
>  	pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
>  		 pwrdm->name, pwrst);
>  
> +	trace_power_domain_target(pwrdm->name, pwrst, smp_processor_id());
> +
>  	prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
>  			     (pwrst << OMAP_POWERSTATE_SHIFT),
>  			     pwrdm->prcm_offs, pwrstctrl_reg_offs);
> diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
> index fc62fb5..7cbb09b 100644
> --- a/arch/arm/plat-omap/clock.c
> +++ b/arch/arm/plat-omap/clock.c
> @@ -21,6 +21,7 @@
>  #include <linux/cpufreq.h>
>  #include <linux/debugfs.h>
>  #include <linux/io.h>
> +#include <trace/events/power.h>
>  
>  #include <plat/clock.h>
>  
> @@ -43,8 +44,10 @@ int clk_enable(struct clk *clk)
>  		return -EINVAL;
>  
>  	spin_lock_irqsave(&clockfw_lock, flags);
> -	if (arch_clock->clk_enable)
> +	if (arch_clock->clk_enable) {
> +		trace_clock_enable(clk->name, 1, smp_processor_id());
>  		ret = arch_clock->clk_enable(clk);
> +	}
>  	spin_unlock_irqrestore(&clockfw_lock, flags);
>  
>  	return ret;
> @@ -66,8 +69,10 @@ void clk_disable(struct clk *clk)
>  		goto out;
>  	}
>  
> -	if (arch_clock->clk_disable)
> +	if (arch_clock->clk_disable) {
> +		trace_clock_disable(clk->name, 0, smp_processor_id());
>  		arch_clock->clk_disable(clk);
> +	}
>  
>  out:
>  	spin_unlock_irqrestore(&clockfw_lock, flags);
> @@ -120,8 +125,10 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
>  		return ret;
>  
>  	spin_lock_irqsave(&clockfw_lock, flags);
> -	if (arch_clock->clk_set_rate)
> +	if (arch_clock->clk_set_rate) {
> +		trace_clock_set_rate(clk->name, rate, smp_processor_id());
>  		ret = arch_clock->clk_set_rate(clk, rate);
> +	}
>  	if (ret == 0) {
>  		if (clk->recalc)
>  			clk->rate = clk->recalc(clk);
> -- 
> 1.7.2.3
> 


- Paul
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