Received-SPF: pass (google.com: domain of linux-kernel+bounces-81536-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Precedence: bulk
MIME-Version: 1.0
References: <CAGsJ_4zera4+bWuXHKjdU3QdiR3sqcUQB3gF08DPD49OCT4S9w@mail.gmail.com>
 <20240226083714.26187-1-ioworker0@gmail.com> <9bcf5141-7376-441e-bbe3-779956ef28b9@redhat.com>
 <CAK1f24mdwjz2J5VmeYSDwb4jMbrXUVCSF_0pOcWSVt1cfa0FhQ@mail.gmail.com> <318be511-06de-423e-8216-af869f27f849@arm.com>
In-Reply-To: <318be511-06de-423e-8216-af869f27f849@arm.com>
From: Lance Yang <ioworker0@gmail.com>
Date: Mon, 26 Feb 2024 21:50:11 +0800
Message-ID: <CAK1f24=yWPQnYuQYgc3cXdBC0HoR1yAwY59Xs2DYPAC4DQzw0A@mail.gmail.com>
Subject: Re: [PATCH 1/1] mm/madvise: enhance lazyfreeing with mTHP in madvise_free
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>, 21cnbao@gmail.com, akpm@linux-foundation.org, 
	linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com, 
	minchan@kernel.org, peterx@redhat.com, shy828301@gmail.com, 
	songmuchun@bytedance.com, wangkefeng.wang@huawei.com, zokeefe@google.com, 
	fengwei.yin@intel.com
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Mon, Feb 26, 2024 at 9:04=E2=80=AFPM Ryan Roberts <ryan.roberts@arm.com>=
 wrote:
>
> On 26/02/2024 08:55, Lance Yang wrote:
> > Hey David,
> >
> > Thanks for your suggestion!
> >
> > On Mon, Feb 26, 2024 at 4:41=E2=80=AFPM David Hildenbrand <david@redhat=
com> wrote:
> >>
> > [...]
> >>> On Mon, Feb 26, 2024 at 12:00=E2=80=AFPM Barry Song <21cnbao@gmail.co=
m> wrote:
> >>> [...]
> >>>> On Mon, Feb 26, 2024 at 1:33=E2=80=AFAM Lance Yang <ioworker0@gmail.=
com> wrote:
> >>> [...]
> > [...]
> >>> +static inline bool pte_range_cont_mapped(pte_t *pte, unsigned long n=
r)
> >>> +{
> >>> +     pte_t pte_val;
> >>> +     unsigned long pfn =3D pte_pfn(pte);
> >>> +     for (int i =3D 0; i < nr; i++) {
> >>> +             pte_val =3D ptep_get(pte + i);
> >>> +             if (pte_none(pte_val) || pte_pfn(pte_val) !=3D (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!
>
> Agreed, folio_pte_batch() is likely to be widely useful for this change a=
nd
> others, so suggest exporting it from memory.c and reusing as is if possib=
le.

Thanks for your suggestion. I'll use folio_pte_batch() in v2.

Best,
Lance

>
> >
> > Best,
> > Lance
> >
> >>
> >> --
> >> Cheers,
> >>
> >> David / dhildenb
> >>
>