f2fs: remove unnecessary threshold

The NM_WOUT_THRESHOLD is now obsolete since f2fs starts to control on a basis
of the memory footprint.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

3 files changed, 5 insertions, 11 deletions

diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index b7111c44a918..b52c12cf5873 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -250,10 +250,10 @@ static int stat_show(struct seq_file *s, void *v)
                            si->ndirty_dent, si->ndirty_dirs);
                 seq_printf(s, "  - meta: %4d in %4d\n",
                            si->ndirty_meta, si->meta_pages);
-                seq_printf(s, "  - NATs: %5d > %lu\n",
-                           si->nats, NM_WOUT_THRESHOLD);
-                seq_printf(s, "  - SITs: %5d\n  - free_nids: %5d\n",
-                           si->sits, si->fnids);
+                seq_printf(s, "  - NATs: %9d\n  - SITs: %9d\n",
+                           si->nats, si->sits);
+                seq_printf(s, "  - free_nids: %9d\n",
+                           si->fnids);
                 seq_puts(s, "\nDistribution of User Blocks:");
                 seq_puts(s, " [ valid | invalid | free ]\n");
                 seq_puts(s, "  [");
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index fec4967fb8d2..daf644c57eae 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -224,7 +224,7 @@ int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
 {
         struct f2fs_nm_info *nm_i = NM_I(sbi);
 
-        if (available_free_memory(nm_i, NAT_ENTRIES) || nr_shrink <= 0)
+        if (available_free_memory(nm_i, NAT_ENTRIES))
                 return 0;
 
         write_lock(&nm_i->nat_tree_lock);
@@ -1830,9 +1830,6 @@ flush_now:
         if (!flushed)
                 mutex_unlock(&curseg->curseg_mutex);
         f2fs_put_page(page, 1);
-
-        /* 2) shrink nat caches if necessary */
-        try_to_free_nats(sbi, nm_i->nat_cnt - NM_WOUT_THRESHOLD);
 }
 
 static int init_node_manager(struct f2fs_sb_info *sbi)
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index c97215432100..c2015b71ff87 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -20,9 +20,6 @@
 /* maximum readahead size for node during getting data blocks */
 #define MAX_RA_NODE             128
 
-/* maximum cached nat entries to manage memory footprint */
-#define NM_WOUT_THRESHOLD       (64 * NAT_ENTRY_PER_BLOCK)
-
 /* control the memory footprint threshold (10MB per 1GB ram) */
 #define DEF_RAM_THRESHOLD       10