linux-kernel - Re: [RFC PATCH 08/11] mm/damon/sysfs-schemes: implement scheme filters

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Message-Id: <20221127195121.1388-1-sj@kernel.org>
Date:   Sun, 27 Nov 2022 19:51:21 +0000
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, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 08/11] mm/damon/sysfs-schemes: implement scheme filters

On Thu, 24 Nov 2022 21:21:11 +0000 SeongJae Park <sj@...nel.org> wrote:

> Implement scheme filters functionality of DAMON sysfs interface by
> making the code reads the values of files under the filter directories
> and pass that to DAMON using DAMON kernel API.
> 
> Signed-off-by: SeongJae Park <sj@...nel.org>
> ---
>  mm/damon/sysfs-schemes.c | 85 +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 84 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
> index 7f2bab617156..6f014b328e6f 100644
> --- a/mm/damon/sysfs-schemes.c
> +++ b/mm/damon/sysfs-schemes.c
[...]
> +static int damon_sysfs_set_scheme_filters(struct damos *scheme,
> +		struct damon_sysfs_scheme_filters *sysfs_filters)
> +{
> +	int i;
> +	struct damos_filter *filter, *next;
> +
> +	damos_for_each_filter_safe(filter, next, scheme)
> +		damos_destroy_filter(filter);
> +
> +	for (i = 0; i < sysfs_filters->nr; i++) {
> +		struct damon_sysfs_scheme_filter *sysfs_filter =
> +			sysfs_filters->filters_arr[i];
> +		struct damos_filter *filter =
> +			damos_new_filter(sysfs_filter->type,
> +					sysfs_filter->matching);
> +		int err;
> +
> +		if (!filter)
> +			return -ENOMEM;
> +		if (filter->type == DAMOS_FILTER_TYPE_MEMCG) {
> +			err = damon_sysfs_memcg_path_to_id(
> +					sysfs_filter->memcg_path,
> +					&filter->memcg_id);
> +			if (err)
> +				return err;
> +		}

Newly created filter should be added to the scheme, but this patch is missing
the code.  Will add that in the next version of this patch.

> +	}
> +	return 0;
> +}
> +