Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ec8ce5ec authored by Liam Mark's avatar Liam Mark
Browse files

mm: vmscan: support complete shrinker reclaim 



Ensure that shrinkers are given the option to completely drop
their caches even when their caches are smaller than the batch size.

This change helps improve memory headroom by ensuring that under
significant memory pressure shrinkers can drop all of their caches.

This change only attempts to more aggressively call the shrinkers
during background memory reclaim inorder to avoid hurting the
perforamnce of direct memory reclaim.

Change-Id: I8dbc29c054add639e4810e36fd2c8a063e5c52f3
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
parent 648cfa62

mm/vmscan.c

+8 −1
Original line number Diff line number Diff line
@@ -293,6 +293,10 @@ unsigned long shrink_slab(struct shrink_control *shrink, 
		long new_nr;

		long batch_size = shrinker->batch ? shrinker->batch

						  : SHRINK_BATCH;

		long min_cache_size = batch_size;



		if (current_is_kswapd())

			min_cache_size = 0;



		max_pass = do_shrinker_shrink(shrinker, shrink, 0);

		if (max_pass <= 0)
@@ -344,9 +348,12 @@ unsigned long shrink_slab(struct shrink_control *shrink, 
					nr_pages_scanned, lru_pages,

					max_pass, delta, total_scan);



		while (total_scan >= batch_size) {

		while (total_scan > min_cache_size) {

			int nr_before;



			if (total_scan < batch_size)

				batch_size = total_scan;



			nr_before = do_shrinker_shrink(shrinker, shrink, 0);

			shrink_ret = do_shrinker_shrink(shrinker, shrink,

							batch_size);