On Mon, 24 Feb 2020 13:30:38 +0100
SeongJae Park <sjpark@xxxxxxxxxx> wrote:
> From: SeongJae Park <sjpark@xxxxxxxxx>
>
> This commit implements callbacks for DAMON. Using this, DAMON users can
> install their callbacks for each step of the access monitoring so that
> they can do something interesting with the monitored access pattrns
patterns
> online. For example, callbacks can report the monitored patterns to
> users or do some access pattern based memory management such as
> proactive reclamations or access pattern based THP promotions/demotions
> decision makings.
>
> Signed-off-by: SeongJae Park <sjpark@xxxxxxxxx>
> ---
> mm/damon.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/mm/damon.c b/mm/damon.c
> index 6a17408e83c2..554720778e8a 100644
> --- a/mm/damon.c
> +++ b/mm/damon.c
> @@ -83,6 +83,10 @@ struct damon_ctx {
> struct rnd_state rndseed;
>
> struct list_head tasks_list; /* 'damon_task' objects */
> +
> + /* callbacks */
> + void (*sample_cb)(struct damon_ctx *context);
> + void (*aggregate_cb)(struct damon_ctx *context);
> };
>
> /* Get a random number in [l, r) */
> @@ -814,9 +818,13 @@ static int kdamond_fn(void *data)
> }
> mmput(mm);
> }
> + if (ctx->sample_cb)
> + ctx->sample_cb(ctx);
>
> if (kdamond_aggregate_interval_passed(ctx)) {
> kdamond_merge_regions(ctx, max_nr_accesses / 10);
> + if (ctx->aggregate_cb)
> + ctx->aggregate_cb(ctx);
> kdamond_flush_aggregated(ctx);
> kdamond_split_regions(ctx);
> }
