Commit e5e7ea3c authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: control the memory footprint used by ino entries 



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

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 8c402946

fs/f2fs/node.c

+22 −6
Original line number Diff line number Diff line
@@ -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;

}

fs/f2fs/node.h

+2 −1
Original line number Diff line number Diff line
@@ -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 {

fs/f2fs/segment.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

}