Getting 'Permission denied (13)' when trying to use systrace on Moto X with KitKat

Certain OEMs have disabled systrace without root permissions in several android versions. Samsung has done this with android 4.3 on the Exynos Galaxy S4. No word on why or if it'll be resolved.

You will need to root your device to access this.

EDIT:

As a further answer to this - many devices with Mediatek chipsets have not enabled systrace in the kernel options. This is due to the fact that Mediatek provides a turn-key solution to OEMs with systrace unchecked. Many OEMs do not change this setting when they receive the pre-configuration.