[PATCH 3.15 72/84] f2fs: adjust free mem size to flush dentry blocks

Greg Kroah-Hartman
2014-07-15T23:30:56Z

From: Jaegeuk Kim <jaegeuk.kim@samsung.com>

commit 6fb03f3a40805a412c9b285010ffdc2e7563f81b upstream.

If so many dirty dentry blocks are cached, not reached to the flush condition,
we should fall into livelock in balance_dirty_pages.
So, let's consider the mem size for the condition.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/f2fs/data.c | 3 ++-
fs/f2fs/f2fs.h | 1 +
fs/f2fs/node.c | 44 ++++++++++++++++++++++++++------------------
fs/f2fs/node.h | 5 +++--
4 files changed, 32 insertions(+), 21 deletions(-)

--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -869,7 +869,8 @@ static int f2fs_write_data_pages(struct
return 0;

if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
- get_dirty_dents(inode) < nr_pages_to_skip(sbi, DATA))
+ get_dirty_dents(inode) < nr_pages_to_skip(sbi, DATA) &&
+ available_free_memory(sbi, DIRTY_DENTS))
goto skip_write;

diff = nr_pages_to_write(sbi, DATA, wbc);
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1140,6 +1140,7 @@ f2fs_hash_t f2fs_dentry_hash(const char
struct dnode_of_data;
struct node_info;

+bool available_free_memory(struct f2fs_sb_info *, int);
int is_checkpointed_node(struct f2fs_sb_info *, nid_t);
bool fsync_mark_done(struct f2fs_sb_info *, nid_t);
void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -26,20 +26,26 @@
static struct kmem_cache *nat_entry_slab;
static struct kmem_cache *free_nid_slab;

-static inline bool available_free_memory(struct f2fs_nm_info *nm_i, int type)
+bool available_free_memory(struct f2fs_sb_info *sbi, int type)
{
+ struct f2fs_nm_info *nm_i = NM_I(sbi);
struct sysinfo val;
unsigned long mem_size = 0;
+ bool res = false;

si_meminfo(&val);
- if (type == FREE_NIDS)
- mem_size = nm_i->fcnt * sizeof(struct free_nid);
- else if (type == NAT_ENTRIES)
- mem_size += nm_i->nat_cnt * sizeof(struct nat_entry);
- mem_size >>= 12;
-
- /* give 50:50 memory for free nids and nat caches respectively */
- return (mem_size < ((val.totalram * nm_i->ram_thresh) >> 11));
+ /* give 25%, 25%, 50% memory for each components respectively */
+ if (type == FREE_NIDS) {
+ mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >> 12;
+ res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
+ } else if (type == NAT_ENTRIES) {
+ mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >> 12;
+ res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
+ } else if (type == DIRTY_DENTS) {
+ mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
+ res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 1);
+ }
+ return res;
}

static void clear_node_page_dirty(struct page *page)
@@ -243,7 +249,7 @@ int try_to_free_nats(struct f2fs_sb_info
{
struct f2fs_nm_info *nm_i = NM_I(sbi);

- if (available_free_memory(nm_i, NAT_ENTRIES))
+ if (available_free_memory(sbi, NAT_ENTRIES))
return 0;

write_lock(&nm_i->nat_tree_lock);
@@ -1315,13 +1321,14 @@ static void __del_from_free_nid_list(str
radix_tree_delete(&nm_i->free_nid_root, i->nid);
}

-static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
+static int add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
{
+ struct f2fs_nm_info *nm_i = NM_I(sbi);
struct free_nid *i;
struct nat_entry *ne;
bool allocated = false;

- if (!available_free_memory(nm_i, FREE_NIDS))
+ if (!available_free_memory(sbi, FREE_NIDS))
return -1;

/* 0 nid should not be used */
@@ -1374,9 +1381,10 @@ static void remove_free_nid(struct f2fs_
kmem_cache_free(free_nid_slab, i);
}

-static void scan_nat_page(struct f2fs_nm_info *nm_i,
+static void scan_nat_page(struct f2fs_sb_info *sbi,
struct page *nat_page, nid_t start_nid)
{
+ struct f2fs_nm_info *nm_i = NM_I(sbi);
struct f2fs_nat_block *nat_blk = page_address(nat_page);
block_t blk_addr;
int i;
@@ -1391,7 +1399,7 @@ static void scan_nat_page(struct f2fs_nm
blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
f2fs_bug_on(blk_addr == NEW_ADDR);
if (blk_addr == NULL_ADDR) {
- if (add_free_nid(nm_i, start_nid, true) < 0)
+ if (add_free_nid(sbi, start_nid, true) < 0)
break;
}
}
@@ -1415,7 +1423,7 @@ static void build_free_nids(struct f2fs_
while (1) {
struct page *page = get_current_nat_page(sbi, nid);

- scan_nat_page(nm_i, page, nid);
+ scan_nat_page(sbi, page, nid);
f2fs_put_page(page, 1);

nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
@@ -1435,7 +1443,7 @@ static void build_free_nids(struct f2fs_
block_t addr = le32_to_cpu(nat_in_journal(sum, i).block_addr);
nid = le32_to_cpu(nid_in_journal(sum, i));
if (addr == NULL_ADDR)
- add_free_nid(nm_i, nid, true);
+ add_free_nid(sbi, nid, true);
else
remove_free_nid(nm_i, nid);
}
@@ -1512,7 +1520,7 @@ void alloc_nid_failed(struct f2fs_sb_inf
spin_lock(&nm_i->free_nid_list_lock);
i = __lookup_free_nid_list(nm_i, nid);
f2fs_bug_on(!i || i->state != NID_ALLOC);
- if (!available_free_memory(nm_i, FREE_NIDS)) {
+ if (!available_free_memory(sbi, FREE_NIDS)) {
__del_from_free_nid_list(nm_i, i);
need_free = true;
} else {
@@ -1843,7 +1851,7 @@ flush_now:
}

if (nat_get_blkaddr(ne) == NULL_ADDR &&
- add_free_nid(NM_I(sbi), nid, false) <= 0) {
+ add_free_nid(sbi, nid, false) <= 0) {
write_lock(&nm_i->nat_tree_lock);
__del_from_nat_cache(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -75,9 +75,10 @@ static inline void node_info_from_raw_na
ni->version = raw_ne->version;
}

-enum nid_type {
+enum mem_type {
FREE_NIDS, /* indicates the free nid list */
- NAT_ENTRIES /* indicates the cached nat entry */
+ NAT_ENTRIES, /* indicates the cached nat entry */
+ DIRTY_DENTS /* indicates dirty dentry pages */
};

/*