Linus Torvalds writes: (Summary) They use it mainly for the TSC,
admittedly, and the example code I looked at all just ignored %rcx,
but maybe they *do* care.
but maybe they *do* care.
And in particular, with rdtscp, the high 32 bits get lost, so your suggestion will mean that the thing doesn't contain the node number at all.
all.
People may in fact use the node number for things like a fast gettimeofday() - knowing that the TSC is synchronized within a node, and doing per-node correction..
and doing per-node correction..
And maybe not.
but maybe they *do* care.
And in particular, with rdtscp, the high 32 bits get lost, so your suggestion will mean that the thing doesn't contain the node number at all.
all.
People may in fact use the node number for things like a fast gettimeofday() - knowing that the TSC is synchronized within a node, and doing per-node correction..
and doing per-node correction..
And maybe not.
