Re: Lets get this right (WAS RE:MOSIX and kernel mods)
Larry McVoy (lm@bitmover.com)
Sun, 07 Mar 1999 00:28:14 -0800
: Sounds good for the different processes case. But I was thinking of
: the shared VM case (threads), where you don't (ideally) even have to
: do that.
:
: Perhaps the best approach is to define extended send semantics to
: "send and I don't mind if my buffer is modified". That would be much
: simpler than stuffing around in the VM layer to do all kinds of
: tricks. Tricks that probably won't work in a shared VM environment
: anyway.
Yes, except that those semantics aren't what people are willing to accept.
And the tricks work just fine in a shared VM - you can mark anything
copy on write. Besides, SGI uses sproc() for threads (an early version
of clone() ).
: > For small data, it was just a copy and a wakeup.
:
: How small is "small"?
Anything less than a page.
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