The quilt patch titled Subject: mm/damon/core: iterate the regions list from current point in damon_set_regions() has been removed from the -mm tree. Its filename was mm-damon-core-iterate-the-regions-list-from-current-point-in-damon_set_regions.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Kaixu Xia <kaixuxia@xxxxxxxxxxx> Subject: mm/damon/core: iterate the regions list from current point in damon_set_regions() Date: Tue, 6 Sep 2022 23:18:47 +0800 We iterate the whole regions list every time to get the first/last regions intersecting with the specific range in damon_set_regions(), in order to add new region or resize existing regions to fit in the specific range. Actually, it is unnecessary to iterate the new added regions and the front regions that have been checked. Just iterate the regions list from the current point using list_for_each_entry_from() every time to improve performance. The kunit tests passed: [PASSED] damon_test_apply_three_regions1 [PASSED] damon_test_apply_three_regions2 [PASSED] damon_test_apply_three_regions3 [PASSED] damon_test_apply_three_regions4 Link: https://lkml.kernel.org/r/1662477527-13003-1-git-send-email-kaixuxia@xxxxxxxxxxx Signed-off-by: Kaixu Xia <kaixuxia@xxxxxxxxxxx> Reviewed-by: SeongJae Park <sj@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/damon.h | 8 ++++++++ mm/damon/core.c | 3 ++- 2 files changed, 10 insertions(+), 1 deletion(-) --- a/include/linux/damon.h~mm-damon-core-iterate-the-regions-list-from-current-point-in-damon_set_regions +++ a/include/linux/damon.h @@ -463,9 +463,17 @@ static inline struct damon_region *damon return list_last_entry(&t->regions_list, struct damon_region, list); } +static inline struct damon_region *damon_first_region(struct damon_target *t) +{ + return list_first_entry(&t->regions_list, struct damon_region, list); +} + #define damon_for_each_region(r, t) \ list_for_each_entry(r, &t->regions_list, list) +#define damon_for_each_region_from(r, t) \ + list_for_each_entry_from(r, &t->regions_list, list) + #define damon_for_each_region_safe(r, next, t) \ list_for_each_entry_safe(r, next, &t->regions_list, list) --- a/mm/damon/core.c~mm-damon-core-iterate-the-regions-list-from-current-point-in-damon_set_regions +++ a/mm/damon/core.c @@ -195,6 +195,7 @@ int damon_set_regions(struct damon_targe damon_destroy_region(r, t); } + r = damon_first_region(t); /* Add new regions or resize existing regions to fit in the ranges */ for (i = 0; i < nr_ranges; i++) { struct damon_region *first = NULL, *last, *newr; @@ -202,7 +203,7 @@ int damon_set_regions(struct damon_targe range = &ranges[i]; /* Get the first/last regions intersecting with the range */ - damon_for_each_region(r, t) { + damon_for_each_region_from(r, t) { if (damon_intersect(r, range)) { if (!first) first = r; _ Patches currently in -mm which might be from kaixuxia@xxxxxxxxxxx are