[CRIU] [PATCH 3/5] vdso: Proxify vDSO code on restore

[Cyrill Gorcunov]

On Mon, May 20, 2013 at 04:16:24PM +0400, Pavel Emelyanov wrote:
> > 
> > always proxy mode will be there anyway, proxy on demand is optimization!
> > that's why I'm asking for always proxy mode being merged first, then
> > we can continue and implement on demand mode.
> 
> Proxy mode is task's address space screw up. Let's not affect those users
> who don't change kernel and don't want this magic to unpredictably spoil
> their software. Please.

I see. Look, to make complete transparent transition where vdso is completely
unchanged I must memcmp(old-vdso, new-vdso, sizeof(vdso)) then I would be
sure the vdso is unchanged and I can reuse one from image, but with new
page-server concept it's pretty hard to implement is small and elegant
way, at least I don't see how at moment.