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Date: Sun, 5 Aug 2018 23:08:59 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 1/2] f2fs: refresh recent accessed nat entry in lru list
From: Chao Yu <yuchao0@...wei.com>
Introduce nat_list_lock to protect nm_i->nat_entries list, and manage
it as a LRU list, refresh location for therein recent accessed entries
in the list.
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
fs/f2fs/f2fs.h | 1 +
fs/f2fs/node.c | 46 ++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 43 insertions(+), 4 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f4b03339799e..afcdba241c4b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -780,6 +780,7 @@ struct f2fs_nm_info {
struct radix_tree_root nat_set_root;/* root of the nat set cache */
struct rw_semaphore nat_tree_lock; /* protect nat_tree_lock */
struct list_head nat_entries; /* cached nat entry list (clean) */
+ spinlock_t nat_list_lock; /* protect clean nat entry list */
unsigned int nat_cnt; /* the # of cached nat entries */
unsigned int dirty_nat_cnt; /* total num of nat entries in set */
unsigned int nat_blocks; /* # of nat blocks */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 81fb2f3edb52..472dd643b074 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -174,14 +174,30 @@ static struct nat_entry *__init_nat_entry(struct f2fs_nm_info *nm_i,
if (raw_ne)
node_info_from_raw_nat(&ne->ni, raw_ne);
+
+ spin_lock(&nm_i->nat_list_lock);
list_add_tail(&ne->list, &nm_i->nat_entries);
+ spin_unlock(&nm_i->nat_list_lock);
+
nm_i->nat_cnt++;
return ne;
}
static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
{
- return radix_tree_lookup(&nm_i->nat_root, n);
+ struct nat_entry *ne;
+
+ ne = radix_tree_lookup(&nm_i->nat_root, n);
+
+ /* for recent accessed nat entry, move it to tail of lru list */
+ if (ne && !get_nat_flag(ne, IS_DIRTY)) {
+ spin_lock(&nm_i->nat_list_lock);
+ if (!list_empty(&ne->list))
+ list_move_tail(&ne->list, &nm_i->nat_entries);
+ spin_unlock(&nm_i->nat_list_lock);
+ }
+
+ return ne;
}
static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
@@ -192,7 +208,6 @@ static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
{
- list_del(&e->list);
radix_tree_delete(&nm_i->nat_root, nat_get_nid(e));
nm_i->nat_cnt--;
__free_nat_entry(e);
@@ -243,16 +258,21 @@ static void __set_nat_cache_dirty(struct f2fs_nm_info *nm_i,
nm_i->dirty_nat_cnt++;
set_nat_flag(ne, IS_DIRTY, true);
refresh_list:
+ spin_lock(&nm_i->nat_list_lock);
if (new_ne)
list_del_init(&ne->list);
else
list_move_tail(&ne->list, &head->entry_list);
+ spin_unlock(&nm_i->nat_list_lock);
}
static void __clear_nat_cache_dirty(struct f2fs_nm_info *nm_i,
struct nat_entry_set *set, struct nat_entry *ne)
{
+ spin_lock(&nm_i->nat_list_lock);
list_move_tail(&ne->list, &nm_i->nat_entries);
+ spin_unlock(&nm_i->nat_list_lock);
+
set_nat_flag(ne, IS_DIRTY, false);
set->entry_cnt--;
nm_i->dirty_nat_cnt--;
@@ -469,13 +489,25 @@ int f2fs_try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
if (!down_write_trylock(&nm_i->nat_tree_lock))
return 0;
- while (nr_shrink && !list_empty(&nm_i->nat_entries)) {
+ spin_lock(&nm_i->nat_list_lock);
+ while (nr_shrink) {
struct nat_entry *ne;
+
+ if (list_empty(&nm_i->nat_entries))
+ break;
+
ne = list_first_entry(&nm_i->nat_entries,
struct nat_entry, list);
+ list_del(&ne->list);
+ spin_unlock(&nm_i->nat_list_lock);
+
__del_from_nat_cache(nm_i, ne);
nr_shrink--;
+
+ spin_lock(&nm_i->nat_list_lock);
}
+ spin_unlock(&nm_i->nat_list_lock);
+
up_write(&nm_i->nat_tree_lock);
return nr - nr_shrink;
}
@@ -2906,6 +2938,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
INIT_RADIX_TREE(&nm_i->nat_root, GFP_NOIO);
INIT_RADIX_TREE(&nm_i->nat_set_root, GFP_NOIO);
INIT_LIST_HEAD(&nm_i->nat_entries);
+ spin_lock_init(&nm_i->nat_list_lock);
mutex_init(&nm_i->build_lock);
spin_lock_init(&nm_i->nid_list_lock);
@@ -3024,8 +3057,13 @@ void f2fs_destroy_node_manager(struct f2fs_sb_info *sbi)
unsigned idx;
nid = nat_get_nid(natvec[found - 1]) + 1;
- for (idx = 0; idx < found; idx++)
+ for (idx = 0; idx < found; idx++) {
+ spin_lock(&nm_i->nat_list_lock);
+ list_del(&natvec[idx]->list);
+ spin_unlock(&nm_i->nat_list_lock);
+
__del_from_nat_cache(nm_i, natvec[idx]);
+ }
}
f2fs_bug_on(sbi, nm_i->nat_cnt);
--
2.18.0
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