On 2/11/2014 8:41 AM, Peter Zijlstra wrote:
On Mon, Feb 03, 2014 at 08:17:47AM -0800, Arjan van de Ven wrote:
On 2/3/2014 6:56 AM, Peter Zijlstra wrote: if there's a simple api like
sched_cpu_cache_wiped(int llc)
that would be very nice for this; the menuidle side knows this for some cases and thus can just call it. This would be a very small and minimal change
if you don't care about llc vs core local caches then that parameter can go away
I assume this is also called for the local cpu... if not then we need to add a cpu number argument
we can also call this from architecture code when wbinvd or the arm equivalent is called etc
A little something like so?
is there value also in doing a cpu level cache flush? (cpu cache flush we know from the C state, for the llc cache flush we need to read an MSR on x86. Not insane expensive but not zero either)