Excerpts from Andy Lutomirski's message of June 5, 2021 3:05 am: > On 6/4/21 9:54 AM, Andy Lutomirski wrote: >> On 5/31/21 11:22 PM, Nicholas Piggin wrote: >>> There haven't been objections to the series since last posting, this >>> is just a rebase and tidies up a few comments minor patch rearranging. >>> >> >> I continue to object to having too many modes. I like my more generic >> improvements better. Let me try to find some time to email again. >> > > Specifically, this: > > https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/mm
That's worse than what powerpc does with the shoot lazies code so we wouldn't use it anyway. The fact is mm-cpumask and lazy mm is very architecture specific, so I don't really see that another "mode" is such a problem, it's for the most part "this is what powerpc does" -> "this is what powerpc does". The only mode in the context switch is just "take a ref on the lazy mm" or "don't take a ref". Surely that's not too onerous to add!? Actually the bigger part of it is actually the no-lazy mmu mode which is not yet used, I thought it was a neat little demonstrator of how code works with/without lazy but I will get rid of that for submission. > I, or someone, needs to dust off my membarrier series before any of > these kinds of changes get made. The barrier situation in the scheduler > is too confusing otherwise. > I disagree, I've disentangled the changes from membarrier stuff now, they can be done concurrently. Thanks, Nick
