diff options
| -rw-r--r-- | mm/zcache.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/mm/zcache.c b/mm/zcache.c index 49b0aac126e6..f329095ebb48 100644 --- a/mm/zcache.c +++ b/mm/zcache.c @@ -68,6 +68,9 @@ static u64 zcache_pool_pages; static u64 zcache_evict_zpages; static u64 zcache_evict_filepages; static u64 zcache_reclaim_fail; +static u64 zcache_pool_shrink; +static u64 zcache_pool_shrink_fail; +static u64 zcache_pool_shrink_pages; static atomic_t zcache_stored_pages = ATOMIC_INIT(0); #define GFP_ZCACHE \ @@ -148,6 +151,64 @@ static void zcache_rbnode_cache_destroy(void) kmem_cache_destroy(zcache_rbnode_cache); } +static unsigned long zcache_count(struct shrinker *s, + struct shrink_control *sc) +{ + unsigned long active_file; + long file_gap; + + active_file = global_page_state(NR_ACTIVE_FILE); + file_gap = zcache_pool_pages - active_file; + if (file_gap < 0) + file_gap = 0; + return file_gap; +} + +static unsigned long zcache_scan(struct shrinker *s, struct shrink_control *sc) +{ + unsigned long active_file; + long file_gap; + unsigned long freed = 0; + static bool running; + struct zcache_pool *zpool = zcache.pools[0]; + + if (running) + goto end; + + running = true; + active_file = global_page_state(NR_ACTIVE_FILE); + + /* + * file_gap == 0 means that the number of pages + * stored by zcache is around twice as many as the + * number of active file pages. + */ + file_gap = zcache_pool_pages - active_file; + if (file_gap < 0) + file_gap = 0; + else + zcache_pool_shrink++; + while (file_gap-- > 0) { + if (zbud_reclaim_page(zpool->pool, 8)) { + zcache_pool_shrink_fail++; + break; + } + freed++; + } + + zcache_pool_shrink_pages += freed; + zcache_pool_pages = zbud_get_pool_size(zpool->pool); + running = false; +end: + return freed; +} + +static struct shrinker zcache_shrinker = { + .scan_objects = zcache_scan, + .count_objects = zcache_count, + .seeks = DEFAULT_SEEKS * 16 +}; + /* * Compression functions * (Below functions are copyed from zswap!) @@ -875,6 +936,14 @@ static int __init zcache_debugfs_init(void) &zcache_evict_filepages); debugfs_create_u64("reclaim_fail", S_IRUGO, zcache_debugfs_root, &zcache_reclaim_fail); + debugfs_create_u64("inactive_pages_refused", S_IRUGO, + zcache_debugfs_root, &zcache_inactive_pages_refused); + debugfs_create_u64("pool_shrink_count", S_IRUGO, + zcache_debugfs_root, &zcache_pool_shrink); + debugfs_create_u64("pool_shrink_fail", S_IRUGO, + zcache_debugfs_root, &zcache_pool_shrink_fail); + debugfs_create_u64("pool_shrink_pages", S_IRUGO, + zcache_debugfs_root, &zcache_pool_shrink_pages); return 0; } @@ -920,6 +989,7 @@ static int __init init_zcache(void) if (zcache_debugfs_init()) pr_warn("debugfs initialization failed\n"); + register_shrinker(&zcache_shrinker); return 0; pcpufail: zcache_comp_exit(); |