8 Dec
2020
8 Dec
'20
9:25 p.m.
On Tue, Dec 08 2020 at 09:33, Andy Lutomirski wrote:
On Tue, Dec 8, 2020 at 8:26 AM Maxim Levitsky mlevitsk@redhat.com wrote:
IIRC we introduced mul_u64_u32_shift() for roughly this reason,but we don't seem to be using it in the relevant code paths. We should be able to use the same basic math with wider intermediates to allow very large intervals between updates.
That's 128 bit math and _NO_ we are not going there for various reasons.
Hint1: There is a world outside of x8664 and TSC. Hint2: Even on x8664 and TSC it comes with performance overhead
Thanks,
tglx