On Tue, 20 Sep 2022 11:44:21 +0800 xiakaixu1987@xxxxxxxxx wrote:
> From: Kaixu Xia <kaixuxia@xxxxxxxxxxx>
>
> The bodies of damon_{reclaim,lru_sort}_apply_parameters() contain
> duplicates. This commit add a common function
> damon_set_region_biggest_system_ram_default() to removes the
> duplicates.
>
> Signed-off-by: Kaixu Xia <kaixuxia@xxxxxxxxxxx>
> Suggested-by: SeongJae Park <sj@xxxxxxxxxx>
> ---
> v2:
> -change the common function name and add kernel comment.
>
> include/linux/damon.h | 3 ++-
> mm/damon/core.c | 35 ++++++++++++++++++++++++++++++++++-
> mm/damon/lru_sort.c | 13 +++----------
> mm/damon/reclaim.c | 13 +++----------
> 4 files changed, 42 insertions(+), 22 deletions(-)
>
> diff --git a/include/linux/damon.h b/include/linux/damon.h
> index e7808a84675f..ed5470f50bab 100644
> --- a/include/linux/damon.h
> +++ b/include/linux/damon.h
> @@ -557,7 +557,8 @@ static inline bool damon_target_has_pid(const struct damon_ctx *ctx)
> int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive);
> int damon_stop(struct damon_ctx **ctxs, int nr_ctxs);
>
> -bool damon_find_biggest_system_ram(unsigned long *start, unsigned long *end);
> +int damon_set_region_biggest_system_ram_default(struct damon_target *t,
> + unsigned long *start, unsigned long *end);
>
> #endif /* CONFIG_DAMON */
>
> diff --git a/mm/damon/core.c b/mm/damon/core.c
> index 9c80c6eb00c2..9e96cb9fb5db 100644
> --- a/mm/damon/core.c
> +++ b/mm/damon/core.c
> @@ -1245,7 +1245,8 @@ static int walk_system_ram(struct resource *res, void *arg)
> * Find biggest 'System RAM' resource and store its start and end address in
> * @start and @end, respectively. If no System RAM is found, returns false.
> */
> -bool damon_find_biggest_system_ram(unsigned long *start, unsigned long *end)
> +static bool damon_find_biggest_system_ram(unsigned long *start,
> + unsigned long *end)
>
> {
> struct damon_system_ram_region arg = {};
> @@ -1259,6 +1260,38 @@ bool damon_find_biggest_system_ram(unsigned long *start, unsigned long *end)
> return true;
> }
>
> +/*
We also need to add one more asterisk here to make this a valid kerneldoc
comment.
> + * damon_set_region_biggest_system_ram_default() - Set the region of the given
> + * monitoring target as requested, or biggest 'System RAM'.
> + * @t: The monitoring target to set the region.
> + * @start: The pointer to the start address of the region.
> + * @end: The pointer to the end address of the region.
> + *
> + * This function sets the region of @t as requested by @start and @end. If the
> + * values of the two pointers are pointing to are zero, however, this function
> + * finds the biggest 'System RAM' resource and set the region to cover the
> + * resource. In the latter case, this function saves the start and end address
> + * of the resource in @start and @end, respectively.
> + *
> + * Return: 0 on success, negative error code otherwise.
> + */
> +int damon_set_region_biggest_system_ram_default(struct damon_target *t,
> + unsigned long *start, unsigned long *end)
> +{
> + struct damon_addr_range addr_range;
> +
> + if (*start > *end)
> + return -EINVAL;
> +
> + if (!*start && !*end &&
> + !damon_find_biggest_system_ram(start, end))
> + return -EINVAL;
> +
> + addr_range.start = *start;
> + addr_range.end = *end;
> + return damon_set_regions(t, &addr_range, 1);
> +}
> +
[...]
Thanks,
SJ
