linux-kernel - Re: [PATCH 1/1] mm/madvise: enhance lazyfreeing with mTHP in madvise

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Date: Mon, 26 Feb 2024 16:55:09 +0800
From: Lance Yang <ioworker0@...il.com>
To: David Hildenbrand <david@...hat.com>
Cc: 21cnbao@...il.com, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, mhocko@...e.com, minchan@...nel.org, peterx@...hat.com, 
	ryan.roberts@....com, shy828301@...il.com, songmuchun@...edance.com, 
	wangkefeng.wang@...wei.com, zokeefe@...gle.com, fengwei.yin@...el.com
Subject: Re: [PATCH 1/1] mm/madvise: enhance lazyfreeing with mTHP in madvise_free

Hey David,

Thanks for your suggestion!

On Mon, Feb 26, 2024 at 4:41 PM David Hildenbrand <david@...hat.com> wrote:
>
[...]
> > On Mon, Feb 26, 2024 at 12:00 PM Barry Song <21cnbao@...il.com> wrote:
> > [...]
> >> On Mon, Feb 26, 2024 at 1:33 AM Lance Yang <ioworker0@...il.com> wrote:
> > [...]
[...]
> > +static inline bool pte_range_cont_mapped(pte_t *pte, unsigned long nr)
> > +{
> > +     pte_t pte_val;
> > +     unsigned long pfn = pte_pfn(pte);
> > +     for (int i = 0; i < nr; i++) {
> > +             pte_val = ptep_get(pte + i);
> > +             if (pte_none(pte_val) || pte_pfn(pte_val) != (pfn + i))
> > +                     return false;
> > +     }
> > +     return true;
> > +}
>
> I dislike the "cont mapped" terminology.
>
> Maybe folio_pte_batch() does what you want?

folio_pte_batch() is a good choice. Appreciate it!

Best,
Lance

>
> --
> Cheers,
>
> David / dhildenb
>