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f2fs: control the memory footprint used by ino entries

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This patch adds to control the memory footprint used by ino entries.
This will conduct best effort, not strictly.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2014-11-06 15:24:46 -08:00
parent 8c402946f0
commit e5e7ea3c86
3 changed files with 26 additions and 8 deletions
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28
fs/f2fs/node.c
View File

@ -31,22 +31,38 @@ 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 avail_ram;
unsigned long mem_size = 0;
bool res = false;
si_meminfo(&val);
/* give 25%, 25%, 50% memory for each components respectively */
/* only uses low memory */
avail_ram = val.totalram - val.totalhigh;
/* give 25%, 25%, 50%, 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);
mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >>
PAGE_CACHE_SHIFT;
res = mem_size < ((avail_ram * 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);
mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >>
PAGE_CACHE_SHIFT;
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
} else if (type == DIRTY_DENTS) {
if (sbi->sb->s_bdi->dirty_exceeded)
return false;
mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 1);
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
} else if (type == INO_ENTRIES) {
int i;
if (sbi->sb->s_bdi->dirty_exceeded)
return false;
for (i = 0; i <= UPDATE_INO; i++)
mem_size += (sbi->ino_num[i] * sizeof(struct ino_entry))
>> PAGE_CACHE_SHIFT;
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
}
return res;
}

3
fs/f2fs/node.h
View File

@ -106,7 +106,8 @@ static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
enum mem_type {
FREE_NIDS, /* indicates the free nid list */
NAT_ENTRIES, /* indicates the cached nat entry */
DIRTY_DENTS /* indicates dirty dentry pages */
DIRTY_DENTS, /* indicates dirty dentry pages */
INO_ENTRIES, /* indicates inode entries */
};
struct nat_entry_set {

3
fs/f2fs/segment.c
View File

@ -276,7 +276,8 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
{
/* check the # of cached NAT entries and prefree segments */
if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||
excess_prefree_segs(sbi))
excess_prefree_segs(sbi) ||
available_free_memory(sbi, INO_ENTRIES))
f2fs_sync_fs(sbi->sb, true);
}