On Tue, 25 Jul 2006 11:08:35 +0900
KAMEZAWA Hiroyuki <[email protected]> wrote:
> > Then the seek and read and such semantics are nice and stable and
> > simple.
> >
> yes...
> I think snapshot at open() is okay.
We cannot do a single kmalloc() like cpuset does.
The kernel presently kind-of guarantees that a 32k kmalloc() will work,
although the VM might have to do very large amounts of work to achieve it.
But 32k is only 8192 processes, so a snapshot will need multiple
allocations and a list and trouble dropping and retaking tasklist_lock to
allocate memory and keeping things stable while doing that. I suspect
it'll end up ugly.
And it permits userspace to pin rather a lot of memory.
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