Commit ebd3f70c authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

mm/damon/paddr: do page level access check for pageout DAMOS action on its own 

'pageout' DAMOS action implementation of 'paddr' DAMON operations set asks
reclaim_pages() to do page level access check if the user is not asking
DAMOS to do that on its own.  Simplify the logic by making the check
always be done by 'paddr'.

Link: https://lkml.kernel.org/r/20240429224451.67081-3-sj@kernel.org


Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 69a5f999

mm/damon/paddr.c

+12 −4
Original line number Diff line number Diff line
@@ -244,16 +244,22 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s) 
{

	unsigned long addr, applied;

	LIST_HEAD(folio_list);

	bool ignore_references = false;

	bool install_young_filter = true;

	struct damos_filter *filter;



	/* respect user's page level reference check handling request */

	/* check access in page level again by default */

	damos_for_each_filter(filter, s) {

		if (filter->type == DAMOS_FILTER_TYPE_YOUNG) {

			ignore_references = true;

			install_young_filter = false;

			break;

		}

	}

	if (install_young_filter) {

		filter = damos_new_filter(DAMOS_FILTER_TYPE_YOUNG, true);

		if (!filter)

			return 0;

		damos_add_filter(s, filter);

	}



	for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {

		struct folio *folio = damon_get_folio(PHYS_PFN(addr));
@@ -275,7 +281,9 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s) 
put_folio:

		folio_put(folio);

	}

	applied = reclaim_pages(&folio_list, ignore_references);

	if (install_young_filter)

		damos_destroy_filter(filter);

	applied = reclaim_pages(&folio_list, true);

	cond_resched();

	return applied * PAGE_SIZE;

}