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$ iostress 32 512 0 > /vtty # before
512 calls, 0 bytes. avg 121133
$ iostress 32 512 0 > /vtty # after
512 calls, 0 bytes. avg 103540
103540/121133 = ~85%
I think the tiny bit of added complexity is worth it here.
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The old style could be confused with a regular function, where the
driver would be executed unconditionally. This should make it more
obvious that the driver doesn't get executed in the parent process.
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What an interesting commit.
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