Commit cdfc41c1 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: throttle the memory footprint with a sysfs entry 



This patch introduces ram_thresh, a sysfs entry, which controls the memory
footprint used by the free nid list and the nat cache.

Previously, the free nid list was controlled by MAX_FREE_NIDS, while the nat
cache was managed by NM_WOUT_THRESHOLD.
However, this approach cannot be applied dynamically according to the system.

So, this patch adds ram_thresh that users can specify the threshold, which is
in order of 1 / 1024.
For example, if the total ram size is 4GB and the value is set to 10 by default,
f2fs tries to control the number of free nids and nat caches not to consume over
10 * (4GB / 1024) = 10MB.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 40bb0058

Documentation/ABI/testing/sysfs-fs-f2fs

+6 −0
Original line number Diff line number Diff line
@@ -55,3 +55,9 @@ Date: January 2014 
Contact:	"Jaegeuk Kim" <jaegeuk.kim@samsung.com>

Description:

		 Controls the number of trials to find a victim segment.



What:		/sys/fs/f2fs/<disk>/ram_thresh

Date:		March 2014

Contact:	"Jaegeuk Kim" <jaegeuk.kim@samsung.com>

Description:

		 Controls the memory footprint used by f2fs.

Documentation/filesystems/f2fs.txt

+4 −0
Original line number Diff line number Diff line
@@ -202,6 +202,10 @@ Files in /sys/fs/f2fs/<devname> 
			      Otherwise, it needs to decrease this value to

			      reduce the space overhead. The default value is 0.



 ram_thresh                   This parameter controls the memory footprint used

			      by free nids and cached nat entries. By default,

			      10 is set, which indicates 10 MB / 1 GB RAM.



================================================================================

USAGE

================================================================================

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -242,6 +242,7 @@ struct f2fs_nm_info { 
	block_t nat_blkaddr;		/* base disk address of NAT */

	nid_t max_nid;			/* maximum possible node ids */

	nid_t next_scan_nid;		/* the next nid to be scanned */

	unsigned int ram_thresh;	/* control the memory footprint */



	/* NAT cache management */

	struct radix_tree_root nat_root;/* root of the nat entry cache */

fs/f2fs/node.c

+20 −3
Original line number Diff line number Diff line
@@ -26,6 +26,22 @@ 
static struct kmem_cache *nat_entry_slab;

static struct kmem_cache *free_nid_slab;



static inline bool available_free_memory(struct f2fs_nm_info *nm_i, int type)

{

	struct sysinfo val;

	unsigned long mem_size = 0;



	si_meminfo(&val);

	if (type == FREE_NIDS)

		mem_size = nm_i->fcnt * sizeof(struct free_nid);

	else if (type == NAT_ENTRIES)

		mem_size += nm_i->nat_cnt * sizeof(struct nat_entry);

	mem_size >>= 12;



	/* give 50:50 memory for free nids and nat caches respectively */

	return (mem_size < ((val.totalram * nm_i->ram_thresh) >> 11));

}



static void clear_node_page_dirty(struct page *page)

{

	struct address_space *mapping = page->mapping;
@@ -208,7 +224,7 @@ int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink) 
{

	struct f2fs_nm_info *nm_i = NM_I(sbi);



	if (nm_i->nat_cnt <= NM_WOUT_THRESHOLD || nr_shrink <= 0)

	if (available_free_memory(nm_i, NAT_ENTRIES) || nr_shrink <= 0)

		return 0;



	write_lock(&nm_i->nat_tree_lock);
@@ -1288,7 +1304,7 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build) 
	struct nat_entry *ne;

	bool allocated = false;



	if (nm_i->fcnt > 2 * MAX_FREE_NIDS)

	if (!available_free_memory(nm_i, FREE_NIDS))

		return -1;



	/* 0 nid should not be used */
@@ -1473,7 +1489,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid) 
	spin_lock(&nm_i->free_nid_list_lock);

	i = __lookup_free_nid_list(nm_i, nid);

	f2fs_bug_on(!i || i->state != NID_ALLOC);

	if (nm_i->fcnt > 2 * MAX_FREE_NIDS) {

	if (!available_free_memory(nm_i, FREE_NIDS)) {

		__del_from_free_nid_list(nm_i, i);

	} else {

		i->state = NID_NEW;
@@ -1836,6 +1852,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi) 
	nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks - 3;

	nm_i->fcnt = 0;

	nm_i->nat_cnt = 0;

	nm_i->ram_thresh = DEF_RAM_THRESHOLD;



	INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);

	INIT_LIST_HEAD(&nm_i->free_nid_list);

fs/f2fs/node.h

+8 −3
Original line number Diff line number Diff line
@@ -17,15 +17,15 @@ 
/* # of pages to perform readahead before building free nids */

#define FREE_NID_PAGES 4



/* maximum # of free node ids to produce during build_free_nids */

#define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES)



/* maximum readahead size for node during getting data blocks */

#define MAX_RA_NODE		128



/* maximum cached nat entries to manage memory footprint */

#define NM_WOUT_THRESHOLD	(64 * NAT_ENTRY_PER_BLOCK)



/* control the memory footprint threshold (10MB per 1GB ram) */

#define DEF_RAM_THRESHOLD	10



/* vector size for gang look-up from nat cache that consists of radix tree */

#define NATVEC_SIZE	64
@@ -77,6 +77,11 @@ static inline void node_info_from_raw_nat(struct node_info *ni, 
	ni->version = raw_ne->version;

}



enum nid_type {

	FREE_NIDS,	/* indicates the free nid list */

	NAT_ENTRIES	/* indicates the cached nat entry */

};



/*

 * For free nid mangement

 */

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