linux-kernel - Re: [PATCH v2 1/2] mm/damon: Move has filter to ops-common

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Message-ID: <aIvoXMbW57IL9X1o@Yueyangs-MacBook-Pro.local>
Date: Thu, 31 Jul 2025 23:04:12 +0100
From: YUEYANG PAN <pyyjason@...il.com>
To: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Usama Arif <usamaarif642@...il.com>, damon@...ts.linux.dev,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mm/damon: Move has filter to ops-common

On Wed, Jul 30, 2025 at 10:45:06AM -0700, SeongJae Park wrote:
> On Wed, 30 Jul 2025 10:19:55 -0700 Yueyang Pan <pyyjason@...il.com> wrote:
> 
> > This patch moves damon_pa_scheme_has_filter to ops-common. renaming
> > to damon_scheme_has_filter.
> > Doing so allows us to reuse its logic in the vaddr version
> > of DAMOS_STAT
> > 
> > Signed-off-by: Yueyang Pan <pyyjason@...il.com>
> > ---
> >  mm/damon/ops-common.c |  9 +++++++++
> >  mm/damon/ops-common.h |  2 ++
> >  mm/damon/paddr.c      | 11 +----------
> >  3 files changed, 12 insertions(+), 10 deletions(-)
> > 
> > diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> > index 99321ff5cb92..3ebfa356ca46 100644
> > --- a/mm/damon/ops-common.c
> > +++ b/mm/damon/ops-common.c
> > @@ -412,3 +412,12 @@ unsigned long damon_migrate_pages(struct list_head *folio_list, int target_nid)
> >  
> >  	return nr_migrated;
> >  }
> > +
> > +bool damon_scheme_has_filter(struct damos *s)
> > +{
> > +	struct damos_filter *f;
> > +
> > +	damos_for_each_ops_filter(f, s)
> > +		return true;
> > +	return false;
> > +}
> 
> I should have tell this earlier, sorry.  I now think it would be good to have
> ops-common.c own prefix, since this namee makes me expect the function is on
> DAMON core layer.  Also, I use normal 'grep' and ctags at the best, and maybe
> I'm not the only one that that lazy at learning new tools.
> 
> Following the weird and none-public naming convention we have on DAMON,
> damos_ops_ for DAMOS-related functions and damon_ops_ for monitoring-related
> functions would be the prefix for ops-common.c.
> 
> So, what about renaming this to damos_ops_has_filter() if we have a chance to
> revision this once again?

Thanks. I will fix it in the next version.

> 
> > diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
> > index 61ad54aaf256..8d5c5c7631ac 100644
> > --- a/mm/damon/ops-common.h
> > +++ b/mm/damon/ops-common.h
> > @@ -21,3 +21,5 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
> >  
> >  bool damos_folio_filter_match(struct damos_filter *filter, struct folio *folio);
> >  unsigned long damon_migrate_pages(struct list_head *folio_list, int target_nid);
> > +
> > +bool damon_scheme_has_filter(struct damos *s);
> > diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> > index 53a55c5114fb..daeceed981a0 100644
> > --- a/mm/damon/paddr.c
> > +++ b/mm/damon/paddr.c
> > @@ -262,22 +262,13 @@ static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s,
> >  	return applied * PAGE_SIZE;
> >  }
> >  
> > -static bool damon_pa_scheme_has_filter(struct damos *s)
> > -{
> > -	struct damos_filter *f;
> > -
> > -	damos_for_each_ops_filter(f, s)
> > -		return true;
> > -	return false;
> > -}
> > -
> >  static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
> >  		unsigned long *sz_filter_passed)
> >  {
> >  	unsigned long addr;
> >  	struct folio *folio;
> >  
> > -	if (!damon_pa_scheme_has_filter(s))
> > +	if (!damon_scheme_has_filter(s))
> >  		return 0;
> >  
> >  	addr = r->ar.start;
> > -- 
> > 2.47.3
> 
> Otherwise, all looks good to me.
> 
> 
> Thanks,
> SJ

Best Wishes
Pan