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f2fs: do retry operations with cond_resched

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This patch revists retrial paths in f2fs.
The basic idea is to use cond_resched instead of retrying from the very early
stage.

Suggested-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2014-12-05 10:39:49 -08:00
parent 769ec6e5b7
commit 9be32d72be
4 changed files with 20 additions and 38 deletions
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41
fs/f2fs/node.c
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@@ -147,7 +147,7 @@ static void __set_nat_cache_dirty(struct f2fs_nm_info *nm_i,
if (get_nat_flag(ne, IS_DIRTY))
return;
retry:
head = radix_tree_lookup(&nm_i->nat_set_root, set);
if (!head) {
head = f2fs_kmem_cache_alloc(nat_entry_set_slab, GFP_ATOMIC);
@@ -156,11 +156,7 @@ retry:
INIT_LIST_HEAD(&head->set_list);
head->set = set;
head->entry_cnt = 0;
if (radix_tree_insert(&nm_i->nat_set_root, set, head)) {
kmem_cache_free(nat_entry_set_slab, head);
goto retry;
}
f2fs_radix_tree_insert(&nm_i->nat_set_root, set, head);
}
list_move_tail(&ne->list, &head->entry_list);
nm_i->dirty_nat_cnt++;
@@ -238,13 +234,8 @@ static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
{
struct nat_entry *new;
new = kmem_cache_alloc(nat_entry_slab, GFP_ATOMIC);
if (!new)
return NULL;
if (radix_tree_insert(&nm_i->nat_root, nid, new)) {
kmem_cache_free(nat_entry_slab, new);
return NULL;
}
new = f2fs_kmem_cache_alloc(nat_entry_slab, GFP_ATOMIC);
f2fs_radix_tree_insert(&nm_i->nat_root, nid, new);
memset(new, 0, sizeof(struct nat_entry));
nat_set_nid(new, nid);
nat_reset_flag(new);
@@ -257,15 +248,11 @@ static void cache_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid,
struct f2fs_nat_entry *ne)
{
struct nat_entry *e;
retry:
down_write(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (!e) {
e = grab_nat_entry(nm_i, nid);
if (!e) {
up_write(&nm_i->nat_tree_lock);
goto retry;
}
node_info_from_raw_nat(&e->ni, ne);
}
up_write(&nm_i->nat_tree_lock);
@@ -276,15 +263,11 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
retry:
down_write(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, ni->nid);
if (!e) {
e = grab_nat_entry(nm_i, ni->nid);
if (!e) {
up_write(&nm_i->nat_tree_lock);
goto retry;
}
e->ni = *ni;
f2fs_bug_on(sbi, ni->blk_addr == NEW_ADDR);
} else if (new_blkaddr == NEW_ADDR) {
@@ -1833,19 +1816,13 @@ static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
nid_t nid = le32_to_cpu(nid_in_journal(sum, i));
raw_ne = nat_in_journal(sum, i);
retry:
down_write(&nm_i->nat_tree_lock);
ne = __lookup_nat_cache(nm_i, nid);
if (ne)
goto found;
ne = grab_nat_entry(nm_i, nid);
if (!ne) {
up_write(&nm_i->nat_tree_lock);
goto retry;
ne = grab_nat_entry(nm_i, nid);
node_info_from_raw_nat(&ne->ni, &raw_ne);
}
node_info_from_raw_nat(&ne->ni, &raw_ne);
found:
__set_nat_cache_dirty(nm_i, ne);
up_write(&nm_i->nat_tree_lock);
}