Andrea Arcangeli wrote:
> The timer irq could keep running on the same CPU with irq disabled for
> more than the rtdsc lower 32bits wrap around. Thus the per-cpu rdtsc info
Why? Could you explain the difference (or point me to the refs)?
Who decides where timer irq happens?
If this is the case, I certainly agree with the statement below.
I don't see it here.
> has to be 64bit wide in your case (in the current 2.2.x code it doesn't
> need that because it's _not_ a per-cpu info because we rely on the TSCs to
> be in sync).
>
> Andrea
Boris
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