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 13:52:06 +0000
From:	Andrew Murray <amurray@...edded-bits.co.uk>
To:	Lee Jones <lee.jones@...aro.org>
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 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.

Andrew Murray
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