linux-kernel - Re: [PATCH RESEND 0/8] hugetlb: add demote/split page functionality

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Message-Id: <20210816173959.950443c7516a2b178e2ec376@linux-foundation.org>
Date:   Mon, 16 Aug 2021 17:39:59 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>, Zi Yan <ziy@...dia.com>,
        Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH RESEND 0/8] hugetlb: add demote/split page functionality

On Mon, 16 Aug 2021 17:17:50 -0700 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> > 
> > And how does one know the operation has completed so the sysfs files
> > can be reloaded for another operation?
> > 
> 
> When the write to the file is complete, the operation has completed.
> Not exactly sure what you mean by reloading the sysfs files for
> another operation?

If userspace wishes to perform another demote operation, it must wait
for the preceding one to complete.

Presumably if thread A is blocked in a write to `demote' and thread B
concurrently tries to perform a demotion, thread B will be blocked as
well?  Was this tested?

Lots of things are to be added to changelogs & documentation, methinks.