linux-kernel - Re: [PATCH 1/2] Boottime: A tool for automatic measurement of kernel/bootloader boot time

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Date:	Thu, 15 Nov 2012 14:37:18 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Andrew Murray <amurray@...edded-bits.co.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, linus.walleij@...ricsson.com,
	jonas.aberg@...ricsson.com, will.deacon@....com, arnd@...db.de,
	Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>
Subject: Re: [PATCH 1/2] Boottime: A tool for automatic measurement of
 kernel/bootloader boot time

On Thu, 15 Nov 2012, Andrew Murray wrote:

> On 15 November 2012 10:04, Lee Jones <lee.jones@...aro.org> wrote:
> > The overhead is very low and the results will be found under
> > sysfs/bootime, as well as detailed results in debugfs under
> > boottime/. The bootgraph* files are compatible with
> > scripts/bootgraph.pl. The reason for this patch is to provide
> > data (sysfs/boottime) suitable for automatic test-cases as
> > well as help for developers to reduce the boot time (debugfs).
> >
> > Based heavily on the original driver by Jonas Aaberg.
> >
> 
> > +
> > +static LIST_HEAD(boottime_list);
> > +static DEFINE_SPINLOCK(boottime_list_lock);
> > +static struct boottime_timer boottime_timer;
> > +static int num_const_boottime_list;
> > +static struct boottime_list const_boottime_list[NUM_STATIC_BOOTTIME_ENTRIES];
> > +static unsigned long time_kernel_done;
> > +static unsigned long time_bootloader_done;
> > +static bool system_up;
> > +static bool boottime_done;
> > +
> > +int __attribute__((weak)) boottime_arch_startup(void)
> > +{
> > +       return 0;
> > +}
> > +
> > +int __attribute__((weak)) boottime_bootloader_idle(void)
> > +{
> > +       return 0;
> > +}
> 
> You may wish to use the __weak macro (include/linux/compiler*) instead
> of directly using GCC attributes here.

Can do, thanks Andy.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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