Commit 554df79e authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: shrink extent_cache entries 



This patch registers shrinking extent_caches.

Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 1b38dc8e

fs/f2fs/data.c

+11 −8
Original line number Diff line number Diff line
@@ -767,7 +767,7 @@ void f2fs_preserve_extent_tree(struct inode *inode) 
		update_inode_page(inode);

}



void f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)

unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)

{

	struct extent_tree *treevec[EXT_TREE_VEC_SIZE];

	struct extent_node *en, *tmp;
@@ -778,10 +778,7 @@ void f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) 
	unsigned int node_cnt = 0, tree_cnt = 0;



	if (!test_opt(sbi, EXTENT_CACHE))

		return;



	if (available_free_memory(sbi, EXTENT_CACHE))

		return;

		return 0;



	spin_lock(&sbi->extent_lock);

	list_for_each_entry_safe(en, tmp, &sbi->extent_list, list) {
@@ -791,7 +788,9 @@ void f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) 
	}

	spin_unlock(&sbi->extent_lock);



	down_read(&sbi->extent_tree_lock);

	if (!down_read_trylock(&sbi->extent_tree_lock))

		goto out;



	while ((found = radix_tree_gang_lookup(&sbi->extent_tree_root,

				(void **)treevec, ino, EXT_TREE_VEC_SIZE))) {

		unsigned i;
@@ -809,7 +808,9 @@ void f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) 
	}

	up_read(&sbi->extent_tree_lock);



	down_write(&sbi->extent_tree_lock);

	if (!down_write_trylock(&sbi->extent_tree_lock))

		goto out;



	radix_tree_for_each_slot(slot, &sbi->extent_tree_root, &iter,

							F2FS_ROOT_INO(sbi)) {

		struct extent_tree *et = (struct extent_tree *)*slot;
@@ -822,8 +823,10 @@ void f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) 
		}

	}

	up_write(&sbi->extent_tree_lock);



out:

	trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt);



	return node_cnt + tree_cnt;

}



void f2fs_destroy_extent_tree(struct inode *inode)

fs/f2fs/f2fs.h

+1 −1
Original line number Diff line number Diff line
@@ -1754,7 +1754,7 @@ void f2fs_submit_page_mbio(struct f2fs_io_info *); 
void set_data_blkaddr(struct dnode_of_data *);

int reserve_new_block(struct dnode_of_data *);

int f2fs_reserve_block(struct dnode_of_data *, pgoff_t);

void f2fs_shrink_extent_tree(struct f2fs_sb_info *, int);

unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *, int);

void f2fs_destroy_extent_tree(struct inode *);

void f2fs_init_extent_cache(struct inode *, struct f2fs_extent *);

void f2fs_update_extent_cache(struct dnode_of_data *);

fs/f2fs/segment.c

+2 −1
Original line number Diff line number Diff line
@@ -304,6 +304,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi) 
void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)

{

	/* try to shrink extent cache when there is no enough memory */

	if (!available_free_memory(sbi, EXTENT_CACHE))

		f2fs_shrink_extent_tree(sbi, EXTENT_CACHE_SHRINK_NUMBER);



	/* check the # of cached NAT entries */

fs/f2fs/shrinker.c

+13 −1
Original line number Diff line number Diff line
@@ -23,6 +23,11 @@ static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi) 
	return NM_I(sbi)->nat_cnt - NM_I(sbi)->dirty_nat_cnt;

}



static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)

{

	return sbi->total_ext_tree + atomic_read(&sbi->total_ext_node);

}



unsigned long f2fs_shrink_count(struct shrinker *shrink,

				struct shrink_control *sc)

{
@@ -42,6 +47,9 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink, 
		}

		spin_unlock(&f2fs_list_lock);



		/* count extent cache entries */

		count += __count_extent_cache(sbi);



		/* shrink clean nat cache entries */

		count += __count_nat_entries(sbi);
@@ -82,8 +90,12 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink, 


		sbi->shrinker_run_no = run_no;



		/* shrink extent cache entries */

		freed += f2fs_shrink_extent_tree(sbi, nr >> 1);



		/* shrink clean nat cache entries */

		freed += try_to_free_nats(sbi, nr);

		if (freed < nr)

			freed += try_to_free_nats(sbi, nr - freed);



		spin_lock(&f2fs_list_lock);

		p = p->next;