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)
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