On Thu, Jul 17, 2008 at 5:41 AM, erik quanstrom <[EMAIL PROTECTED]> wrote:
> as you've pointed out, performance-wise it's not copying vs. nothing > it's copying vs page faults and trips through the vm code. > i would think playing vm games (as linus likes to say) would make > scheduling on mp harder > But you make trips through the vm code on read/write in any event, don't you? There was a pretty good paper comparing these paths once and in the end it boiled down to "your cost will vary depending on how you wrote the kernel" :-) This problem has been worked for a long time by Sun among others. They've had several decades to think on it. ron
