linux-kernel - Re: [PATCH] mm/damon/core: check apply interval in

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Message-Id: <20240205201109.88463-1-sj@kernel.org>
Date: Mon,  5 Feb 2024 12:11:09 -0800
From: SeongJae Park <sj@...nel.org>
To: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	stable@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/damon/core: check apply interval in

I mistakenly broke the subject of the patch.  I will send the complete one
again.

On Sun,  4 Feb 2024 12:49:46 -0800 SeongJae Park <sj@...nel.org> wrote:

> kdamond_apply_schemes() checks apply intervals of schemes and avoid
> further applying any schemes if no scheme passed its apply interval.
> However, the following schemes applying function,
> damon_do_apply_schemes() iterates all schemes without the apply interval
> check.  As a result, the shortest apply interval is applied to all
> schemes.  Fix the problem by checking the apply interval in
> damon_do_apply_schemes().
> 
> Fixes: 42f994b71404 ("mm/damon/core: implement scheme-specific apply interval")
> Cc: <stable@...r.kernel.org> # 6.7.x
> Signed-off-by: SeongJae Park <sj@...nel.org>
> ---
>  mm/damon/core.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/damon/core.c b/mm/damon/core.c
> index 0c144fb466b8..f444734cc613 100644
> --- a/mm/damon/core.c
> +++ b/mm/damon/core.c
> @@ -1064,6 +1064,9 @@ static void damon_do_apply_schemes(struct damon_ctx *c,
>  	damon_for_each_scheme(s, c) {
>  		struct damos_quota *quota = &s->quota;
>  
> +		if (c->passed_sample_intervals != s->next_apply_sis)
> +			continue;
> +
>  		if (!s->wmarks.activated)
>  			continue;
>  
> @@ -1216,10 +1219,6 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
>  		if (c->passed_sample_intervals != s->next_apply_sis)
>  			continue;
>  
> -		s->next_apply_sis +=
> -			(s->apply_interval_us ? s->apply_interval_us :
> -			 c->attrs.aggr_interval) / sample_interval;
> -
>  		if (!s->wmarks.activated)
>  			continue;
>  
> @@ -1235,6 +1234,14 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
>  		damon_for_each_region_safe(r, next_r, t)
>  			damon_do_apply_schemes(c, t, r);
>  	}
> +
> +	damon_for_each_scheme(s, c) {
> +		if (c->passed_sample_intervals != s->next_apply_sis)
> +			continue;
> +		s->next_apply_sis +=
> +			(s->apply_interval_us ? s->apply_interval_us :
> +			 c->attrs.aggr_interval) / sample_interval;
> +	}
>  }
>  
>  /*
> -- 
> 2.39.2