Re: [PATCH v6 4/5] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN

2023-01-18 Thread Nicholas Piggin
On Thu Jan 19, 2023 at 3:30 AM AEST, Linus Torvalds wrote: > [ Adding a few more x86 and arm64 maintainers - while linux-arch is > the right mailing list, I'm not convinced people actually follow it > all that closely ] > > On Wed, Jan 18, 2023 at 12:00 AM Nicholas Piggin wrote: > > > > On a

Re: [PATCH v6 4/5] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN

2023-01-18 Thread Linus Torvalds
[ Adding a few more x86 and arm64 maintainers - while linux-arch is the right mailing list, I'm not convinced people actually follow it all that closely ] On Wed, Jan 18, 2023 at 12:00 AM Nicholas Piggin wrote: > > On a 16-socket 192-core POWER8 system, a context switching benchmark > with as

[PATCH v6 4/5] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN

2023-01-18 Thread Nicholas Piggin
On a 16-socket 192-core POWER8 system, a context switching benchmark with as many software threads as CPUs (so each switch will go in and out of idle), upstream can achieve a rate of about 1 million context switches per second, due to contention on the mm refcount. 64s meets the prerequisites for