Linus Torvalds wrote:
I wonder if the whole "round_jiffies()" thing should be written so that it
never rounds down, or at least never rounds down to before the current
second!
that's what it is supposed to do already...
166
167 if (j <= jiffies) /* rounding ate our timeout entirely; */
168 return original;
169 return j;
170 }
so there is always a gap of at least 1 jiffie no matter what
I have to say, I also think it's a bit iffy to do "round_jiffies()" at all
in that per-CPU kind of way. The "per-cpu" thing is quite possibly going
to change by the time we actually add the timer, so the goal of trying to
get wakeups to happen in "bunches" per CPU should really be done by
setting a flag on the timer itself - so that we could do that rounding
when the timer is actually added to the per-cpu queues!
it's pretty much the same thing though
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