On Thu, Jun 08, 2006 at 06:53:13PM +0200, Alexander Leidinger wrote: > Hi, > > Roman (and I) need someone who is able to explain fork() and VM stuff. > > The problem is that the linux clone() syscall is supposed to do COW of > the stack in some cases (if the child_stack argument is NULL it has to > COW the thread stack, making a copy immediately is maybe ok too as a > workaround). I don't know enough about the VM, so I ask here. This is very strange behaviuor. You mean that other vm_map_entry would be shared, but stack itself becomes divorsed ?
I vaguely remember some thread on linux-kernel (that got wide press coverage :)) where Linus very strong disagreed to proposal of implementing IRIX-like procs. As far as I remember, the question was exactly making the private stacks while having other vm space shared. Anyway, this looks interesting, I would like to participate :). > > We looked at the code of fork1(), but I can't find a description of > what it is supposed to do and how flags are interpreted. Based upon the > first comment in fork1() it may be able to do it itself. But this > comment may also be completely unrelated to the solution we search. Flags to fork1() are documented at man rfork(2).
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