On Tue, Feb 11, 2014 at 09:12:02AM -0800, Arjan van de Ven wrote: > 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)
L1 or L2? L1 is too small to really bother afaik and L2 is shared between logical cpus so we'd need a mask there, not sure the generic topology has that. I'll have a quick peek later. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
