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timecounter: keep track of accumulated fractional nanoseconds

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The current timecounter implementation will drop a variable amount
of resolution, depending on the magnitude of the time delta. In
other words, reading the clock too often or too close to a time
stamp conversion will introduce errors into the time values. This
patch fixes the issue by introducing a fractional nanosecond field
that accumulates the low order bits.

Reported-by: Janusz Użycki <j.uzycki@elproma.com.pl>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2014-12-21 19:47:06 +01:00 • committed by David S. Miller
commit 2eebdde652
4 changed files with 40 additions and 17 deletions
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3
virt/kvm/arm/arch_timer.c
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@ -152,7 +152,8 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
return;
}
ns = cyclecounter_cyc2ns(timecounter->cc, cval - now);
ns = cyclecounter_cyc2ns(timecounter->cc, cval - now, timecounter->mask,
&timecounter->frac);
timer_arm(timer, ns);
}