On 11/20/2013 2:58 AM, Peter Zijlstra wrote:
On Wed, Nov 20, 2013 at 11:28:03AM +0100, Peter Zijlstra wrote:
On Tue, Nov 19, 2013 at 01:06:30PM -0800, Jacob Pan wrote:
I applied this patch on top of upstream kernel (801a760) and found out
my machine completely failed to enter idle when nothing is running.
turbostate shows 100% C0. ftrace shows kernel coming in and out of idle
frequently.
Both ACPI idle and intel_idle behaves the same way. I have to do the
following change to allow entering C-states again.
That doesn't make any sense; current_set_polling_and_test() returns the
same thing need_resched() does.
But you're right, intel_idle resides 100% in C0 and acpi_idle has 100%
C1 residency... most weird.
So pretty silly actually; you cannot do a store (any store) in between
monitor and mwait.
you can
just not to the cacheline you are watching (or things that alias with that)
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