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btrfs: reclaim compression cache in shrinker-sized batches #10

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btrfs: reclaim compression cache in shrinker-sized batches #10

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18 changes: 13 additions & 5 deletions fs/btrfs/compression.c
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Original file line number Diff line number Diff line change
Expand Up @@ -155,16 +155,24 @@ static unsigned long btrfs_compr_pool_scan(struct shrinker *sh, struct shrink_co
{
LIST_HEAD(remove);
struct list_head *tmp, *next;
int freed;
unsigned long nr_to_scan = sc ? sc->nr_to_scan : ULONG_MAX;
unsigned long freed;

if (compr_pool.count == 0)
return SHRINK_STOP;

/* For now, just simply drain the whole list. */
/*
* Reclaim only the requested batch under memory pressure. Teardown
* passes a NULL shrink_control and still drains the whole cache.
*/
spin_lock(&compr_pool.lock);
list_splice_init(&compr_pool.list, &remove);
freed = compr_pool.count;
compr_pool.count = 0;
for (freed = 0; freed < nr_to_scan && !list_empty(&compr_pool.list); freed++) {
struct page *page;

page = list_first_entry(&compr_pool.list, struct page, lru);
list_move(&page->lru, &remove);
}
compr_pool.count -= freed;
spin_unlock(&compr_pool.lock);

list_for_each_safe(tmp, next, &remove) {
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