@@ -742,6 +742,7 @@ struct damos *damon_new_scheme(struct damos_access_pattern *pattern,
int target_nid);
void damon_add_scheme(struct damon_ctx *ctx, struct damos *s);
void damon_destroy_scheme(struct damos *s);
+int damos_commit_quota_goals(struct damos_quota *dst, struct damos_quota *src);
struct damon_target *damon_new_target(void);
void damon_add_target(struct damon_ctx *ctx, struct damon_target *t);
@@ -666,6 +666,65 @@ void damon_set_schemes(struct damon_ctx *ctx, struct damos **schemes,
damon_add_scheme(ctx, schemes[i]);
}
+static struct damos_quota_goal *damos_nth_quota_goal(
+ int n, struct damos_quota *q)
+{
+ struct damos_quota_goal *goal;
+ int i = 0;
+
+ damos_for_each_quota_goal(goal, q) {
+ if (i++ == n)
+ return goal;
+ }
+ return NULL;
+}
+
+static void damos_commit_quota_goal(
+ struct damos_quota_goal *dst, struct damos_quota_goal *src)
+{
+ dst->metric = src->metric;
+ dst->target_value = src->target_value;
+ if (dst->metric == DAMOS_QUOTA_USER_INPUT)
+ dst->current_value = src->current_value;
+ /* keep last_psi_total as is, since it will be updated in next cycle */
+}
+
+/**
+ * damos_commit_quota_goals() - Commit DAMOS quota goals to another quota.
+ * @dst: The commit destination DAMOS quota.
+ * @src: The commit source DAMOS quota.
+ *
+ * Copies user-specified parameters for quota goals from @src to @dst. Users
+ * should use this function for quota goals-level parameters update of running
+ * DAMON contexts, instead of manual in-place updates.
+ *
+ * This function should be called from parameters-update safe context, like
+ * DAMON callbacks.
+ */
+int damos_commit_quota_goals(struct damos_quota *dst, struct damos_quota *src)
+{
+ struct damos_quota_goal *dst_goal, *next, *src_goal, *new_goal;
+ int i = 0, j = 0;
+
+ damos_for_each_quota_goal_safe(dst_goal, next, dst) {
+ src_goal = damos_nth_quota_goal(i++, src);
+ if (src_goal)
+ damos_commit_quota_goal(dst_goal, src_goal);
+ else
+ damos_destroy_quota_goal(dst_goal);
+ }
+ damos_for_each_quota_goal_safe(src_goal, next, src) {
+ if (j++ < i)
+ continue;
+ new_goal = damos_new_quota_goal(
+ src_goal->metric, src_goal->target_value);
+ if (!new_goal)
+ return -ENOMEM;
+ damos_add_quota_goal(dst, new_goal);
+ }
+ return 0;
+}
+
/**
* damon_nr_running_ctxs() - Return number of currently running contexts.
*/
Implement functions for supporting online DAMOS quota goals parameters update. The function receives two DAMOS quota structs. One is the struct that currently being used by a kdamond and therefore to be updated. The other one contains the parameters to be applied to the first one. The function applies the new parameters to the destination struct while keeping/updating the internal status. The function should be called from parameters-update safe place, like DAMON callbacks. Signed-off-by: SeongJae Park <sj@kernel.org> --- include/linux/damon.h | 1 + mm/damon/core.c | 59 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+)