On Mon, 2019-07-29 at 17:44 +0200, Peter Zijlstra wrote: > On Mon, Jul 29, 2019 at 11:28:04AM -0400, Rik van Riel wrote: > > On Mon, 2019-07-29 at 17:03 +0200, Peter Zijlstra wrote: > > > > > The 'sad' part is that x86 already switches to init_mm on idle > > > and we > > > only keep the active_mm around for 'stupid'. > > > > Wait, where do we do that? > > drivers/idle/intel_idle.c: leave_mm(cpu); > drivers/acpi/processor_idle.c: acpi_unlazy_tlb(smp_processor_id());
This is only done for deeper c-states, isn't it? > > > Rik and Andy were working on getting that 'fixed' a while ago, > > > not > > > sure > > > where that went. > > > > My lazy TLB stuff got merged last year. > > Yes, but we never got around to getting rid of active_mm for x86, > right? True, we still use active_mm. Getting rid of the active_mm refcounting alltogether did not look entirely worthwhile the hassle. -- All Rights Reversed.
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