linux-kernel - Re: [PATCH v2 6/9] mm: free user PTE page table pages

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Message-ID: <01754b36-12c6-48dc-4f84-c289b7aa47ec@redhat.com>
Date:   Wed, 1 Sep 2021 20:10:05 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Qi Zheng <zhengqi.arch@...edance.com>, akpm@...ux-foundation.org,
        tglx@...utronix.de, hannes@...xchg.org, mhocko@...nel.org,
        vdavydov.dev@...il.com, kirill.shutemov@...ux.intel.com,
        mika.penttila@...tfour.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        songmuchun@...edance.com
Subject: Re: [PATCH v2 6/9] mm: free user PTE page table pages

On 01.09.21 20:09, Jason Gunthorpe wrote:
> On Wed, Sep 01, 2021 at 07:58:47PM +0200, David Hildenbrand wrote:
>> You'll most likely have to touch each and every place either way, for
>> example when suddenly returning "null" instead of a pte. It's just a matter
>> of making this easier to review and the changes as minimal and as clear as
>> possible.
> 
> I imagine the leading series to add the simplified API would include
> the null return already - the THP race avoidance requires it anyhow.
> 

Okay, so we're on the same page.

> So you end up with a simpler self contained series that is a stand
> alone improvement followed by a much smaller series here that doesn't
> got back and re-touch the first series's changes.

Exactly.


-- 
Thanks,

David / dhildenb