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-rw-r--r--Documentation/ABI/testing/sysfs-fs-f2fs6
-rw-r--r--Documentation/filesystems/f2fs.txt4
-rw-r--r--fs/f2fs/f2fs.h1
-rw-r--r--fs/f2fs/node.c23
-rw-r--r--fs/f2fs/node.h11
-rw-r--r--fs/f2fs/super.c5
6 files changed, 44 insertions, 6 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 32b0809..4ac2c25 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -55,3 +55,9 @@ Date: January 2014
Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
Description:
Controls the number of trials to find a victim segment.
+
+What: /sys/fs/f2fs/<disk>/ram_thresh
+Date: March 2014
+Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
+Description:
+ Controls the memory footprint used by f2fs.
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index 89dd977..a920935 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -194,6 +194,10 @@ Files in /sys/fs/f2fs/<devname>
Otherwise, it needs to decrease this value to
reduce the space overhead. The default value is 0.
+ ram_thresh This parameter controls the memory footprint used
+ by free nids and cached nat entries. By default,
+ 10 is set, which indicates 10 MB / 1 GB RAM.
+
================================================================================
USAGE
================================================================================
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 0104415..ebe80f4 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -242,6 +242,7 @@ struct f2fs_nm_info {
block_t nat_blkaddr; /* base disk address of NAT */
nid_t max_nid; /* maximum possible node ids */
nid_t next_scan_nid; /* the next nid to be scanned */
+ unsigned int ram_thresh; /* control the memory footprint */
/* NAT cache management */
struct radix_tree_root nat_root;/* root of the nat entry cache */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ecfedf8..68dd8cc 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -26,6 +26,22 @@
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)
+{
+ struct sysinfo val;
+ unsigned long mem_size = 0;
+
+ 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));
+}
+
static void clear_node_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
@@ -208,7 +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 (nm_i->nat_cnt <= NM_WOUT_THRESHOLD || nr_shrink <= 0)
+ if (available_free_memory(nm_i, NAT_ENTRIES) || nr_shrink <= 0)
return 0;
write_lock(&nm_i->nat_tree_lock);
@@ -1286,7 +1302,7 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
struct nat_entry *ne;
bool allocated = false;
- if (nm_i->fcnt > 2 * MAX_FREE_NIDS)
+ if (!available_free_memory(nm_i, FREE_NIDS))
return -1;
/* 0 nid should not be used */
@@ -1471,7 +1487,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
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 (nm_i->fcnt > 2 * MAX_FREE_NIDS) {
+ if (!available_free_memory(nm_i, FREE_NIDS)) {
__del_from_free_nid_list(nm_i, i);
} else {
i->state = NID_NEW;
@@ -1834,6 +1850,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks - 3;
nm_i->fcnt = 0;
nm_i->nat_cnt = 0;
+ nm_i->ram_thresh = DEF_RAM_THRESHOLD;
INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
INIT_LIST_HEAD(&nm_i->free_nid_list);
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index ee6d286..c972154 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -17,15 +17,15 @@
/* # of pages to perform readahead before building free nids */
#define FREE_NID_PAGES 4
-/* maximum # of free node ids to produce during build_free_nids */
-#define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES)
-
/* 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
+
/* vector size for gang look-up from nat cache that consists of radix tree */
#define NATVEC_SIZE 64
@@ -77,6 +77,11 @@ static inline void node_info_from_raw_nat(struct node_info *ni,
ni->version = raw_ne->version;
}
+enum nid_type {
+ FREE_NIDS, /* indicates the free nid list */
+ NAT_ENTRIES /* indicates the cached nat entry */
+};
+
/*
* For free nid mangement
*/
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 4accb9a..034eda1 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -74,6 +74,7 @@ static match_table_t f2fs_tokens = {
enum {
GC_THREAD, /* struct f2fs_gc_thread */
SM_INFO, /* struct f2fs_sm_info */
+ NM_INFO, /* struct f2fs_nm_info */
F2FS_SBI, /* struct f2fs_sb_info */
};
@@ -92,6 +93,8 @@ static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
return (unsigned char *)sbi->gc_thread;
else if (struct_type == SM_INFO)
return (unsigned char *)SM_I(sbi);
+ else if (struct_type == NM_INFO)
+ return (unsigned char *)NM_I(sbi);
else if (struct_type == F2FS_SBI)
return (unsigned char *)sbi;
return NULL;
@@ -183,6 +186,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
+F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
@@ -198,6 +202,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(min_ipu_util),
ATTR_LIST(max_victim_search),
ATTR_LIST(dir_level),
+ ATTR_LIST(ram_thresh),
NULL,
};
generated by cgit v1.1 at 2024-06-08 00:36:50 +0000