Commit 1b38dc8e authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: shrink nat_cache entries 



This patch registers shrinking nat_cache entries.

Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 2658e50d

fs/f2fs/node.c

+3 −3
Original line number Diff line number Diff line
@@ -328,11 +328,11 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni, 
int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)

{

	struct f2fs_nm_info *nm_i = NM_I(sbi);

	int nr = nr_shrink;



	if (available_free_memory(sbi, NAT_ENTRIES))

	if (!down_write_trylock(&nm_i->nat_tree_lock))

		return 0;



	down_write(&nm_i->nat_tree_lock);

	while (nr_shrink && !list_empty(&nm_i->nat_entries)) {

		struct nat_entry *ne;

		ne = list_first_entry(&nm_i->nat_entries,
@@ -341,7 +341,7 @@ int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink) 
		nr_shrink--;

	}

	up_write(&nm_i->nat_tree_lock);

	return nr_shrink;

	return nr - nr_shrink;

}



/*

fs/f2fs/segment.c

+6 −2
Original line number Diff line number Diff line
@@ -306,8 +306,12 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi) 
	/* try to shrink extent cache when there is no enough memory */

	f2fs_shrink_extent_tree(sbi, EXTENT_CACHE_SHRINK_NUMBER);



	/* check the # of cached NAT entries and prefree segments */

	if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||

	/* check the # of cached NAT entries */

	if (!available_free_memory(sbi, NAT_ENTRIES))

		try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK);



	/* checkpoint is the only way to shrink partial cached entries */

	if (!available_free_memory(sbi, NAT_ENTRIES) ||

			excess_prefree_segs(sbi) ||

			!available_free_memory(sbi, INO_ENTRIES))

		f2fs_sync_fs(sbi->sb, true);

fs/f2fs/shrinker.c

+9 −2
Original line number Diff line number Diff line
@@ -18,6 +18,11 @@ static LIST_HEAD(f2fs_list); 
static DEFINE_SPINLOCK(f2fs_list_lock);

static unsigned int shrinker_run_no;



static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi)

{

	return NM_I(sbi)->nat_cnt - NM_I(sbi)->dirty_nat_cnt;

}



unsigned long f2fs_shrink_count(struct shrinker *shrink,

				struct shrink_control *sc)

{
@@ -37,7 +42,8 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink, 
		}

		spin_unlock(&f2fs_list_lock);



		/* TODO: count # of objects */

		/* shrink clean nat cache entries */

		count += __count_nat_entries(sbi);



		spin_lock(&f2fs_list_lock);

		p = p->next;
@@ -76,7 +82,8 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink, 


		sbi->shrinker_run_no = run_no;



		/* TODO: shrink caches */

		/* shrink clean nat cache entries */

		freed += try_to_free_nats(sbi, nr);



		spin_lock(&f2fs_list_lock);

		p = p->next;