linux-kernel - Re: [PATCH 1/4] mm/gup: Add FOLL

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Message-ID: <20220625235904.GK23621@ziepe.ca>
Date:   Sat, 25 Jun 2022 20:59:04 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Peter Xu <peterx@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Linux MM Mailing List <linux-mm@...ck.org>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH 1/4] mm/gup: Add FOLL_INTERRUPTIBLE

On Fri, Jun 24, 2022 at 09:23:04PM -0400, Peter Xu wrote:
> If to go back to the original question with a shorter answer: if the ioctl
> context that GUP upon a page that will never be with a uffd context, then
> it's probably not gonna help at all.. at least not before we use
> FAULT_FLAG_INTERRUPTIBLE outside uffd page fault handling.

I think I would be more interested in this if it could abort a swap
in, for instance. Doesn't this happen if it flows the interruptible
flag into the VMA's fault handler?

Jason