> -----Original Message----- > From: Rob Herring [mailto:robherring2@xxxxxxxxx] > Sent: Thursday, January 20, 2011 8:44 PM > To: Santosh Shilimkar > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Russell King; linux- > omap@xxxxxxxxxxxxxxx; Linus Walleij > Subject: Re: [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK > to speed-up boot > > On 01/20/2011 03:42 AM, Santosh Shilimkar wrote: > > On some architectures, secondary cores shares clock with primiary > > core and hence scale together. Hence secondary core lpj > calibration > > is not necessary and can be skipped to save considerable time. > > > > This can speed up the secondary cpu boot and hotplug cpu online > > paths. > > > > Discussion thread: > > http://www.spinics.net/lists/arm-kernel/msg111124.html > > > > There's already one way to do this with pre-calculated lpj. > How about the hot-plug path? This is not for just boot. > Also, this isn't multi-platform friendly. You could accomplish the > same > thing using the clock api to get the core frequency of each core and > only calculate lpj if the frequency is different. May be but what's wrong with the obvious approach which is completely non-intrusive. Why is not multi-platform friendly ? Archs can choose not to select this option. Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
