Viresh,
On 2015/1/30 12:14, Viresh Kumar wrote:
On 30 January 2015 at 09:16, ethan zhao <ethan.zhao@xxxxxxxxxx> wrote:
You mean the policy is shared by all CPUs, so PPC notification about one
A policy may or maynot be shared by multiple CPUs. It all depends on your
systems configuration. All CPUs which share clock line, share a policy.
You can verify that from /sys/devices/system/cpu/cpu*/related_cpus. This
gives the CPUs that share policy.
CPU should update all CPU's policy, right ? even the requested CPU is
shutting down.
CPUs sharing policy have a single policy structure. And so policy would
be updated for all CPUs that share the poilcy. Even if some cpu goes down,
the policy might still be up and running.
Let' me check ACPI spec and BIOS to match your implementation.
About that patch you suggested, there is another question left pending:
Policy will be freed only when that's last CPU shutting down, how does it
happen when system booting ?
The description of the patch would be wrong (the Xen_bus call stack) --
Did the xen_bus shut down every CPU till the last during booting ?
Thanks,
Ethan
--
viresh
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