On Thu, 27 Oct 2016, Alexey Makhalov wrote:
> Set pv_time_ops.sched_clock to vmware_sched_clock().
Please do not describe WHAT the patch does, describe why. Describe the
problem you are solving. I can see from the patch
> + pv_time_ops.sched_clock = vmware_sched_clock;
that you set
Set pv_time_ops.sched_clock to vmware_sched_clock(). It is simplified
version of native_sched_clock() without ring buffer of mult/shift/offset
triplets and preempt toggling.
Since VMware hypervisor provides constant tsc we can use constant
mult/shift/offset triplet calculated at boot time.
no-vmw-
On Tue, 25 Oct 2016, Alexey Makhalov wrote:
> no-vmw-sched-clock kernel parameter is added to switch back to the
> native_sched_clock() implementation.
You are not switching back. The parameter is used to disable the paravirt
sched clock.
> #ifdef CONFIG_PARAVIRT
> +static struct cyc2ns_data vmw
Set pv_time_ops.sched_clock to vmware_sched_clock(). It is simplified
version of native_sched_clock() without ring buffer of mult/shift/offset
triplets and preempt toggling.
Since VMware hypervisor provides constant tsc we can use constant
mult/shift/offset triplet calculated at boot time.
no-vmw-
