linux-kernel - Re: [PATCH 4/5] mm/khugepaged: Convert alloc_charge

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Message-ID: <CAOzc2pwRoYhhrCkHXyBD90OzZR4AwV3t9fgEuOo84ftKXKMcbQ@mail.gmail.com>
Date:   Wed, 18 Oct 2023 10:21:25 -0700
From:   Vishal Moola <vishal.moola@...il.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, shy828301@...il.com
Subject: Re: [PATCH 4/5] mm/khugepaged: Convert alloc_charge_hpage() to use folios

On Mon, Oct 16, 2023 at 8:48 PM Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
>
>
> On 2023/10/17 4:05, Vishal Moola (Oracle) wrote:
> > Also convert hpage_collapse_alloc_page() to
> > hpage_collapse_alloc_folio().
> >
> > This removes 1 call to compound_head() and helps convert khugepaged to
> > use folios throughout.
> >
> > Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
> > ---
> >   mm/khugepaged.c | 13 +++++++------
> >   1 file changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> > index fa21a53ce0c0..70bba8ddea13 100644
> > --- a/mm/khugepaged.c
> > +++ b/mm/khugepaged.c
> > @@ -886,16 +886,16 @@ static int hpage_collapse_find_target_node(struct collapse_control *cc)
> >   }
> >   #endif
> >
> > -static bool hpage_collapse_alloc_page(struct page **hpage, gfp_t gfp, int node,
> > +static bool hpage_collapse_alloc_folio(struct folio **folio, gfp_t gfp, int node,
> >                                     nodemask_t *nmask)
> >   {
> > -     *hpage = __alloc_pages(gfp, HPAGE_PMD_ORDER, node, nmask);
> > -     if (unlikely(!*hpage)) {
> > +     *folio = __folio_alloc(gfp, HPAGE_PMD_ORDER, node, nmask);
> > +
> > +     if (unlikely(!*folio)) {
> >               count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
> >               return false;
> >       }
> >
> > -     folio_prep_large_rmappable((struct folio *)*hpage);
> >       count_vm_event(THP_COLLAPSE_ALLOC);
> >       return true;
> >   }
> > @@ -1062,15 +1062,16 @@ static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm,
> >       int node = hpage_collapse_find_target_node(cc);
> >       struct folio *folio;
> >
> > -     if (!hpage_collapse_alloc_page(hpage, gfp, node, &cc->alloc_nmask))
> > +     if (!hpage_collapse_alloc_folio(&folio, gfp, node, &cc->alloc_nmask))
> >               return SCAN_ALLOC_HUGE_PAGE_FAIL;
> >
> > -     folio = page_folio(*hpage);
> >       if (unlikely(mem_cgroup_charge(folio, mm, gfp))) {
> >               folio_put(folio);
> >               *hpage = NULL;
> >               return SCAN_CGROUP_CHARGE_FAIL;
> >       }
> > +
> > +     *hpage = folio_page(folio, 0);
> >       count_memcg_page_event(*hpage, THP_COLLAPSE_ALLOC);
>
> count_memcg_folio_events（）and kill count_memcg_page_event?
> >
> >       return SCAN_SUCCEED;

Thanks, I didn't notice that was the last caller.