On Thu, Mar 21, 2013 at 11:06:47AM +0000, Mark Rutland wrote: > On TC2 this series leads to using the vexpress 24MHz clock as the sched clock > in preference to the architected timer: > > Architected local timer running at 24.00MHz (virt). > Switching to timer-based delay loop > Registered arch_counter_get_cntvct+0x0/0x14 as sched_clock source > sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms > Registered versatile_read_sched_clock+0x0/0x28 as sched_clock source > > As they both have the same frequency, neither overrides the other, and > whichever gets registered last is used as the sched_clock. As accesses > to the architected timer are going to have a much lower overhead, this > isn't very nice (and it could be better to use it even if it had a lower > frequency).
I'll remind people that sched_clock() is supposed to be functional at the point in the boot sequence where the call to sched_init() is called. That is after setup_arch() and *before* time_init() is called. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
