On Wed, Jan 20, 2016 at 01:02:25PM +0100, Joerg Roedel wrote: > On Tue, Jan 12, 2016 at 10:15:05AM +0800, Huang Shijie wrote: > > This patch adds a shortcut for the code when the @device_node is NULL. > > In my juno-r1 board, the boot time can be faster by 0.004014s. > > How have you made sure this number is reliable and not just noise in the > boot process? In the boot process, there are 5 or more modules whose @dev_node are NULL. Without the patch, the kernel will waste some cycles to do the meaningless calculations for all these modules. In theory, it is not noise. If you have interest, I can send you the kernel boot logs. :)
Of course, the 0.004014s maybe not accurate enough, it is just an approximate number. Thanks Huang Shijie _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
