linux-kernel - Re: [PATCH] mm/damon: rename damon_pageout_score() to damon_cold

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Message-ID: <CAGjdHunWLqgkhCjsB6t3gV4fzVhBs6=Nj1va1sdCbrQ=Fyu53g@mail.gmail.com>
Date:   Sat, 17 Sep 2022 21:34:52 +0800
From:   Kaixu Xia <xiakaixu1987@...il.com>
To:     SeongJae Park <sj@...nel.org>
Cc:     akpm@...ux-foundation.org, damon@...ts.linux.dev,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Kaixu Xia <kaixuxia@...cent.com>
Subject: Re: [PATCH] mm/damon: rename damon_pageout_score() to damon_cold_score()

On Sat, Sep 17, 2022 at 7:12 PM SeongJae Park <sj@...nel.org> wrote:
>
> On Sat, 17 Sep 2022 17:39:18 +0800 xiakaixu1987@...il.com wrote:
>
> > From: Kaixu Xia <kaixuxia@...cent.com>
> >
> > In the beginning there is only one damos_action 'DAMOS_PAGEOUT'
> > that need to get the coldness score of a region for a scheme,
> > which using damon_pageout_score() to do that. But now there are
> > also other damos_action actions need the coldness score, so
> > rename it to damon_cold_score() to make more sense.
>
> Good idea.
>
> >
> > Signed-off-by: Kaixu Xia <kaixuxia@...cent.com>
> > ---
> >  mm/damon/ops-common.c | 2 +-
> >  mm/damon/ops-common.h | 2 +-
> >  mm/damon/paddr.c      | 5 ++---
> >  mm/damon/vaddr.c      | 2 +-
> >  4 files changed, 5 insertions(+), 6 deletions(-)
> >
> > diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> > index 9310df72e1c5..75409601f934 100644
> > --- a/mm/damon/ops-common.c
> > +++ b/mm/damon/ops-common.c
> > @@ -130,7 +130,7 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
> >       return hotness;
> >  }
> >
> > -int damon_pageout_score(struct damon_ctx *c, struct damon_region *r,
> > +int damon_cold_score(struct damon_ctx *c, struct damon_region *r,
> >                       struct damos *s)
> >  {
> >       int hotness = damon_hot_score(c, r, s);
> > diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
> > index 52329ff361cd..8d82d3722204 100644
> > --- a/mm/damon/ops-common.h
> > +++ b/mm/damon/ops-common.h
> > @@ -12,7 +12,7 @@ struct page *damon_get_page(unsigned long pfn);
> >  void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr);
> >  void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr);
> >
> > -int damon_pageout_score(struct damon_ctx *c, struct damon_region *r,
> > +int damon_cold_score(struct damon_ctx *c, struct damon_region *r,
> >                       struct damos *s);
> >  int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
> >                       struct damos *s);
> > diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> > index dfeebffe82f4..e495146e49e9 100644
> > --- a/mm/damon/paddr.c
> > +++ b/mm/damon/paddr.c
> > @@ -287,11 +287,10 @@ static int damon_pa_scheme_score(struct damon_ctx *context,
> >  {
> >       switch (scheme->action) {
> >       case DAMOS_PAGEOUT:
> > -             return damon_pageout_score(context, r, scheme);
> > +     case DAMOS_LRU_DEPRIO:
> > +             return damon_cold_score(context, r, scheme);
> >       case DAMOS_LRU_PRIO:
> >               return damon_hot_score(context, r, scheme);
> > -     case DAMOS_LRU_DEPRIO:
> > -             return damon_pageout_score(context, r, scheme);
>
> I'm not a big fan of switch-case fall-through, and want to keep the order of
> cases here more similar to that in damos_action definition.  Let's change only
> the function name.
>
Ok, I'll follow that in the next version.

Thanks,
Kaixu
> Other than that,
>
> Reviewed-by: SeongJae Park <sj@...nel.org>
>
>
> Thanks,
> SJ
>
> >       default:
> >               break;
> >       }
> > diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
> > index f53c2ff2bcc8..ea94e0b2c311 100644
> > --- a/mm/damon/vaddr.c
> > +++ b/mm/damon/vaddr.c
> > @@ -673,7 +673,7 @@ static int damon_va_scheme_score(struct damon_ctx *context,
> >
> >       switch (scheme->action) {
> >       case DAMOS_PAGEOUT:
> > -             return damon_pageout_score(context, r, scheme);
> > +             return damon_cold_score(context, r, scheme);
> >       default:
> >               break;
> >       }
> > --
> > 2.27.0
> >
> >