Messages in this thread | | | Subject | Re: [PATCH] clocksource: Load the ACPI PM clocksource asynchronously | From | john stultz <> | Date | Wed, 01 Feb 2012 18:40:27 -0800 |
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On Mon, 2012-01-30 at 20:51 -0800, Arjan van de Ven wrote: > From ef4b0d23878277dfd75828f13353e605aae2937f Mon Sep 17 00:00:00 2001 > From: Arjan van de Ven <arjan@linux.intel.com> > Date: Mon, 30 Jan 2012 20:23:30 -0800 > Subject: [PATCH] clocksource: Load the ACPI PM clocksource asynchronously > > The ACPI clocksource takes quite some time to initialize, > and this increases the boot time of the kernel for a > double digit percentage. This while almost all modern > systems will be using the HPET already anyway. > > This patch turns the clocksource loading into an asynchronous > operation; which means it won't hold up the boot while > still becoming available normally. > > To make this work well, an udelay() had to be turned into an > usleep_range() so that on UP systems, we yield the CPU to > regular boot tasks instead of spinning. > > CC: John Stultz <johnstul@us.ibm.com> > CC: Thomas Gleixner <tglx@linutronix.de> > CC: Len Brown <lenb@kernel.org> > > Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Looks good to me. I've gone ahead and queued it
thanks -john
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