Messages in this thread | | | Date | Tue, 11 Feb 2014 09:12:02 -0800 | From | Arjan van de Ven <> | Subject | Re: [RFC PATCH 3/3] idle: store the idle state index in the struct rq |
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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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