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Commit 5e14327f authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: limit # of inmemory pages 



If some abnormal users try lots of atomic write operations, f2fs is able to
produce pinned pages in the main memory which affects system performance.
This patch limits that as 20% over total memory size, and if f2fs reaches
to the limit, it will drop all the inmemory pages.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent a064458a

fs/f2fs/data.c

+8 −0
Original line number Diff line number Diff line
@@ -1944,6 +1944,12 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, 


	trace_f2fs_write_begin(inode, pos, len, flags);



	if (f2fs_is_atomic_file(inode) &&

			!available_free_memory(sbi, INMEM_PAGES)) {

		err = -ENOMEM;

		goto fail;

	}



	/*

	 * We should check this at this moment to avoid deadlock on inode page

	 * and #0 page. The locking rule for inline_data conversion should be:
@@ -2021,6 +2027,8 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, 
fail:

	f2fs_put_page(page, 1);

	f2fs_write_failed(mapping, pos + len);

	if (f2fs_is_atomic_file(inode))

		drop_inmem_pages_all(sbi);

	return err;

}

fs/f2fs/f2fs.h

+3 −0
Original line number Diff line number Diff line
@@ -601,6 +601,7 @@ struct f2fs_inode_info { 
#endif

	struct list_head dirty_list;	/* dirty list for dirs and files */

	struct list_head gdirty_list;	/* linked in global dirty list */

	struct list_head inmem_ilist;	/* list for inmem inodes */

	struct list_head inmem_pages;	/* inmemory pages managed by f2fs */

	struct task_struct *inmem_task;	/* store inmemory task */

	struct mutex inmem_lock;	/* lock for inmemory pages */
@@ -965,6 +966,7 @@ enum inode_type { 
	DIR_INODE,			/* for dirty dir inode */

	FILE_INODE,			/* for dirty regular/symlink inode */

	DIRTY_META,			/* for all dirtied inode metadata */

	ATOMIC_FILE,			/* for all atomic files */

	NR_INODE_TYPE,

};
@@ -2544,6 +2546,7 @@ void destroy_node_manager_caches(void); 
 */

bool need_SSR(struct f2fs_sb_info *sbi);

void register_inmem_page(struct inode *inode, struct page *page);

void drop_inmem_pages_all(struct f2fs_sb_info *sbi);

void drop_inmem_pages(struct inode *inode);

void drop_inmem_page(struct inode *inode, struct page *page);

int commit_inmem_pages(struct inode *inode);

fs/f2fs/node.c

+4 −0
Original line number Diff line number Diff line
@@ -74,6 +74,10 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type) 
				atomic_read(&sbi->total_ext_node) *

				sizeof(struct extent_node)) >> PAGE_SHIFT;

		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);

	} else if (type == INMEM_PAGES) {

		/* it allows 20% / total_ram for inmemory pages */

		mem_size = get_pages(sbi, F2FS_INMEM_PAGES);

		res = mem_size < (val.totalram / 5);

	} else {

		if (!sbi->sb->s_bdi->wb.dirty_exceeded)

			return true;

fs/f2fs/node.h

+1 −0
Original line number Diff line number Diff line
@@ -140,6 +140,7 @@ enum mem_type { 
	DIRTY_DENTS,	/* indicates dirty dentry pages */

	INO_ENTRIES,	/* indicates inode entries */

	EXTENT_CACHE,	/* indicates extent cache */

	INMEM_PAGES,	/* indicates inmemory pages */

	BASE_CHECK,	/* check kernel status */

};

fs/f2fs/segment.c

+38 −0
Original line number Diff line number Diff line
@@ -186,6 +186,7 @@ bool need_SSR(struct f2fs_sb_info *sbi) 


void register_inmem_page(struct inode *inode, struct page *page)

{

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	struct f2fs_inode_info *fi = F2FS_I(inode);

	struct inmem_pages *new;
@@ -204,6 +205,10 @@ void register_inmem_page(struct inode *inode, struct page *page) 
	mutex_lock(&fi->inmem_lock);

	get_page(page);

	list_add_tail(&new->list, &fi->inmem_pages);

	spin_lock(&sbi->inode_lock[ATOMIC_FILE]);

	if (list_empty(&fi->inmem_ilist))

		list_add_tail(&fi->inmem_ilist, &sbi->inode_list[ATOMIC_FILE]);

	spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);

	inc_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);

	mutex_unlock(&fi->inmem_lock);
@@ -262,12 +267,41 @@ static int __revoke_inmem_pages(struct inode *inode, 
	return err;

}



void drop_inmem_pages_all(struct f2fs_sb_info *sbi)

{

	struct list_head *head = &sbi->inode_list[ATOMIC_FILE];

	struct inode *inode;

	struct f2fs_inode_info *fi;

next:

	spin_lock(&sbi->inode_lock[ATOMIC_FILE]);

	if (list_empty(head)) {

		spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);

		return;

	}

	fi = list_first_entry(head, struct f2fs_inode_info, inmem_ilist);

	inode = igrab(&fi->vfs_inode);

	spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);



	if (inode) {

		drop_inmem_pages(inode);

		iput(inode);

	}

	congestion_wait(BLK_RW_ASYNC, HZ/50);

	cond_resched();

	goto next;

}



void drop_inmem_pages(struct inode *inode)

{

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	struct f2fs_inode_info *fi = F2FS_I(inode);



	mutex_lock(&fi->inmem_lock);

	__revoke_inmem_pages(inode, &fi->inmem_pages, true, false);

	spin_lock(&sbi->inode_lock[ATOMIC_FILE]);

	if (!list_empty(&fi->inmem_ilist))

		list_del_init(&fi->inmem_ilist);

	spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);

	mutex_unlock(&fi->inmem_lock);



	clear_inode_flag(inode, FI_ATOMIC_FILE);
@@ -399,6 +433,10 @@ int commit_inmem_pages(struct inode *inode) 
		/* drop all uncommitted pages */

		__revoke_inmem_pages(inode, &fi->inmem_pages, true, false);

	}

	spin_lock(&sbi->inode_lock[ATOMIC_FILE]);

	if (!list_empty(&fi->inmem_ilist))

		list_del_init(&fi->inmem_ilist);

	spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);

	mutex_unlock(&fi->inmem_lock);



	clear_inode_flag(inode, FI_ATOMIC_COMMIT);