Messages in this thread | | | Subject | Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error | From | Paolo Bonzini <> | Date | Wed, 13 Jul 2016 15:51:57 +0200 |
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On 13/07/2016 15:49, Peter Zijlstra wrote: > On Wed, Jul 13, 2016 at 03:03:42PM +0200, Nicolai Stange wrote: > >> clockevents_config_and_register(levt, >> + (u32)(((u64)tsc_khz * 1000) / >> + TSC_DIVISOR), >> 0xF, ~0UL); > > div_u64() perhaps ?
Or just squash together the two patches and do
tsc_khz * (1000 / TSC_DIVISOR)
because with TSC_DIVISOR equal to 2/4/8 there is no error from reassociating the operation.
Paolo
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