async_pf.c && use_mm() (Was: mm,vmacache: also flush cache for VM_CLONE)

[Oleg Nesterov]

On 03/13, Oleg Nesterov wrote:
>
> Hmm, but at first glance async_pf_execute() doesn't need use_mm() at all.

Seriously, why it nees use_mm? get_user_pages(mm => apf->mm) should work.
Perhaps there is some kvm magic ?

But actually I am writing this email because mmdrop() doesn't look right
or I missed something. I think that kvm_setup_async_pf() should increment
->mm_users and async_pf_execute() needs mmput() ?

Oleg.

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