[PATCH] mm/damon/core.c: avoid unintentional filtering out of schemes

[PATCH] mm/damon/core.c: avoid unintentional filtering out of schemes

[Hyeongtak Ji]

The function '__damos_filter_out()' causes DAMON to always filter out
schemes whose filter type is anon or memcg if its matching value is set
to false.

This commit addresses the issue by ensuring that '__damos_filter_out()'
no longer applies to filters whose type is 'anon' or 'memcg'.

Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
---
 mm/damon/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index bcd2bd9d6c10..d5ef8945a343 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -920,7 +920,7 @@ static bool __damos_filter_out(struct damon_ctx *ctx, struct damon_target *t,
 		matched = true;
 		break;
 	default:
-		break;
+		return false;
 	}
 
 	return matched == filter->matching;
-- 
2.7.4

Re: [PATCH] mm/damon/core.c: avoid unintentional filtering out of schemes

[SeongJae Park]

Hello Hyueongtak,

On Fri, 10 Nov 2023 14:37:09 +0900 Hyeongtak Ji <hyeongtak.ji@gmail.com> wrote:

> The function '__damos_filter_out()' causes DAMON to always filter out
> schemes whose filter type is anon or memcg if its matching value is set
> to false.
> 
> This commit addresses the issue by ensuring that '__damos_filter_out()'
> no longer applies to filters whose type is 'anon' or 'memcg'.

Nice catch, thank you!

checkpatch.pl shows one warning, though:

    WARNING: From:/Signed-off-by: email address mismatch: 'From: Hyeongtak Ji <hyeongtak.ji@gmail.com>' != 'Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>'

> 
> Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>

Reviewed-by: SeongJae Park <sj@kernel.org>


Thanks,
SJ

> ---
>  mm/damon/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/damon/core.c b/mm/damon/core.c
> index bcd2bd9d6c10..d5ef8945a343 100644
> --- a/mm/damon/core.c
> +++ b/mm/damon/core.c
> @@ -920,7 +920,7 @@ static bool __damos_filter_out(struct damon_ctx *ctx, struct damon_target *t,
>  		matched = true;
>  		break;
>  	default:
> -		break;
> +		return false;


>  	}
>  
>  	return matched == filter->matching;
> -- 
> 2.7.4
> 
> 

Re: [PATCH] mm/damon/core.c: avoid unintentional filtering out of schemes

[Andrew Morton]

On Fri, 10 Nov 2023 18:22:40 +0000 SeongJae Park <sj@kernel.org> wrote:

> Hello Hyueongtak,
> 
> On Fri, 10 Nov 2023 14:37:09 +0900 Hyeongtak Ji <hyeongtak.ji@gmail.com> wrote:
> 
> > The function '__damos_filter_out()' causes DAMON to always filter out
> > schemes whose filter type is anon or memcg if its matching value is set
> > to false.
> > 
> > This commit addresses the issue by ensuring that '__damos_filter_out()'
> > no longer applies to filters whose type is 'anon' or 'memcg'.
> 
> Nice catch, thank you!
> 
> checkpatch.pl shows one warning, though:
> 
>     WARNING: From:/Signed-off-by: email address mismatch: 'From: Hyeongtak Ji <hyeongtak.ji@gmail.com>' != 'Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>'

This can be addressed by including an explicit From: line at start of
changelog.  Which should we use?

> > 
> > Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
> 
> Reviewed-by: SeongJae Park <sj@kernel.org>

I'll add 

Fixes: ab9bda001b681 ("mm/damon/core: introduce address range type damos filter")
Cc: <stable@vger.kernel.org>

Re: [PATCH] mm/damon/core.c: avoid unintentional filtering out of schemes

[SeongJae Park]

On Fri, 10 Nov 2023 18:22:40 +0000 SeongJae Park <sj@kernel.org> wrote:

> Hello Hyueongtak,
> 
> On Fri, 10 Nov 2023 14:37:09 +0900 Hyeongtak Ji <hyeongtak.ji@gmail.com> wrote:
> 
> > The function '__damos_filter_out()' causes DAMON to always filter out
> > schemes whose filter type is anon or memcg if its matching value is set
> > to false.
> > 
> > This commit addresses the issue by ensuring that '__damos_filter_out()'
> > no longer applies to filters whose type is 'anon' or 'memcg'.
> 
> Nice catch, thank you!
> 
> checkpatch.pl shows one warning, though:
> 
>     WARNING: From:/Signed-off-by: email address mismatch: 'From: Hyeongtak Ji <hyeongtak.ji@gmail.com>' != 'Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>'
> 

Also, I think we need to add below?

Fixes: ab9bda001b68 ("mm/damon/core: introduce address range type damos filter")
Cc: <stable@vger.kernel.org> # 6.6.y

> > 
> > Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
> 
> Reviewed-by: SeongJae Park <sj@kernel.org>


Thanks,
SJ

[...]

Re: [PATCH] mm/damon/core.c: avoid unintentional filtering out of schemes

[Hyeongtak Ji]

On Sat, Nov 11, 2023 at 3:31 AM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Fri, 10 Nov 2023 18:22:40 +0000 SeongJae Park <sj@kernel.org> wrote:
>
> > Hello Hyueongtak,
> >
> > On Fri, 10 Nov 2023 14:37:09 +0900 Hyeongtak Ji <hyeongtak.ji@gmail.com> wrote:
> >
> > > The function '__damos_filter_out()' causes DAMON to always filter out
> > > schemes whose filter type is anon or memcg if its matching value is set
> > > to false.
> > >
> > > This commit addresses the issue by ensuring that '__damos_filter_out()'
> > > no longer applies to filters whose type is 'anon' or 'memcg'.
> >
> > Nice catch, thank you!
> >
> > checkpatch.pl shows one warning, though:
> >
> >     WARNING: From:/Signed-off-by: email address mismatch: 'From: Hyeongtak Ji <hyeongtak.ji@gmail.com>' != 'Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>'
>
> This can be addressed by including an explicit From: line at start of
> changelog.  Which should we use?

Please use <hyeongtak.ji@sk.com> if it's possible.

>
> > >
> > > Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
> >
> > Reviewed-by: SeongJae Park <sj@kernel.org>
>
> I'll add
>
> Fixes: ab9bda001b681 ("mm/damon/core: introduce address range type damos filter")
> Cc: <stable@vger.kernel.org>
>