diff options
Diffstat (limited to 'mm/workingset.c')
| -rw-r--r-- | mm/workingset.c | 56 |
1 files changed, 43 insertions, 13 deletions
diff --git a/mm/workingset.c b/mm/workingset.c index 98f830897b1b..ef556bf1323d 100644 --- a/mm/workingset.c +++ b/mm/workingset.c @@ -10,6 +10,7 @@ #include <linux/atomic.h> #include <linux/module.h> #include <linux/swap.h> +#include <linux/dax.h> #include <linux/fs.h> #include <linux/mm.h> @@ -334,18 +335,45 @@ out: * point where they would still be useful. */ -struct list_lru workingset_shadow_nodes; +static struct list_lru shadow_nodes; + +void workingset_update_node(struct radix_tree_node *node, void *private) +{ + struct address_space *mapping = private; + + /* Only regular page cache has shadow entries */ + if (dax_mapping(mapping) || shmem_mapping(mapping)) + return; + + /* + * Track non-empty nodes that contain only shadow entries; + * unlink those that contain pages or are being freed. + * + * Avoid acquiring the list_lru lock when the nodes are + * already where they should be. The list_empty() test is safe + * as node->private_list is protected by &mapping->tree_lock. + */ + if (node->count && node->count == node->exceptional) { + if (list_empty(&node->private_list)) { + node->private_data = mapping; + list_lru_add(&shadow_nodes, &node->private_list); + } + } else { + if (!list_empty(&node->private_list)) + list_lru_del(&shadow_nodes, &node->private_list); + } +} static unsigned long count_shadow_nodes(struct shrinker *shrinker, struct shrink_control *sc) { - unsigned long shadow_nodes; unsigned long max_nodes; + unsigned long nodes; unsigned long pages; /* list_lru lock nests inside IRQ-safe mapping->tree_lock */ local_irq_disable(); - shadow_nodes = list_lru_shrink_count(&workingset_shadow_nodes, sc); + nodes = list_lru_shrink_count(&shadow_nodes, sc); local_irq_enable(); if (sc->memcg) { @@ -372,10 +400,10 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker, */ max_nodes = pages >> (1 + RADIX_TREE_MAP_SHIFT - 3); - if (shadow_nodes <= max_nodes) + if (nodes <= max_nodes) return 0; - return shadow_nodes - max_nodes; + return nodes - max_nodes; } static enum lru_status shadow_lru_isolate(struct list_head *item, @@ -418,22 +446,25 @@ static enum lru_status shadow_lru_isolate(struct list_head *item, * no pages, so we expect to be able to remove them all and * delete and free the empty node afterwards. */ - if (WARN_ON_ONCE(!workingset_node_shadows(node))) + if (WARN_ON_ONCE(!node->exceptional)) goto out_invalid; - if (WARN_ON_ONCE(workingset_node_pages(node))) + if (WARN_ON_ONCE(node->count != node->exceptional)) goto out_invalid; for (i = 0; i < RADIX_TREE_MAP_SIZE; i++) { if (node->slots[i]) { if (WARN_ON_ONCE(!radix_tree_exceptional_entry(node->slots[i]))) goto out_invalid; + if (WARN_ON_ONCE(!node->exceptional)) + goto out_invalid; if (WARN_ON_ONCE(!mapping->nrexceptional)) goto out_invalid; node->slots[i] = NULL; - workingset_node_shadows_dec(node); + node->exceptional--; + node->count--; mapping->nrexceptional--; } } - if (WARN_ON_ONCE(workingset_node_shadows(node))) + if (WARN_ON_ONCE(node->exceptional)) goto out_invalid; inc_node_state(page_pgdat(virt_to_page(node)), WORKINGSET_NODERECLAIM); __radix_tree_delete_node(&mapping->page_tree, node); @@ -456,8 +487,7 @@ static unsigned long scan_shadow_nodes(struct shrinker *shrinker, /* list_lru lock nests inside IRQ-safe mapping->tree_lock */ local_irq_disable(); - ret = list_lru_shrink_walk(&workingset_shadow_nodes, sc, - shadow_lru_isolate, NULL); + ret = list_lru_shrink_walk(&shadow_nodes, sc, shadow_lru_isolate, NULL); local_irq_enable(); return ret; } @@ -496,7 +526,7 @@ static int __init workingset_init(void) pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n", timestamp_bits, max_order, bucket_order); - ret = list_lru_init_key(&workingset_shadow_nodes, &shadow_nodes_key); + ret = list_lru_init_key(&shadow_nodes, &shadow_nodes_key); if (ret) goto err; ret = register_shrinker(&workingset_shadow_shrinker); @@ -504,7 +534,7 @@ static int __init workingset_init(void) goto err_list_lru; return 0; err_list_lru: - list_lru_destroy(&workingset_shadow_nodes); + list_lru_destroy(&shadow_nodes); err: return ret; } |