Commit ea1a29a0 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: export ra_nid_pages to sysfs 



After finishing building free nid cache, we will try to readahead
asynchronously 4 more pages for the next reloading, the count of
readahead nid pages is fixed.

In some case, like SMR drive, read less sectors with fixed count
each time we trigger RA may be low efficient, since we will face
high seeking overhead, so we'd better let user to configure this
parameter from sysfs in specific workload.

Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 2db2388f

Documentation/ABI/testing/sysfs-fs-f2fs

+6 −0
Original line number Diff line number Diff line
@@ -86,3 +86,9 @@ Date: October 2015 
Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>

Description:

		 Controls the checkpoint timing.



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

Date:		October 2015

Contact:	"Chao Yu" <chao2.yu@samsung.com>

Description:

		 Controls the count of nid pages to be readaheaded.

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -510,6 +510,7 @@ struct f2fs_nm_info { 
	nid_t available_nids;		/* maximum available node ids */

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

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

	unsigned int ra_nid_pages;	/* # of nid pages to be readaheaded */



	/* NAT cache management */

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

fs/f2fs/node.c

+2 −1
Original line number Diff line number Diff line
@@ -1562,7 +1562,7 @@ static void build_free_nids(struct f2fs_sb_info *sbi) 
	mutex_unlock(&curseg->curseg_mutex);



	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nm_i->next_scan_nid),

					FREE_NID_PAGES, META_NAT, false);

					nm_i->ra_nid_pages, META_NAT, false);

}



/*
@@ -2005,6 +2005,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi) 
	nm_i->fcnt = 0;

	nm_i->nat_cnt = 0;

	nm_i->ram_thresh = DEF_RAM_THRESHOLD;

	nm_i->ra_nid_pages = DEF_RA_NID_PAGES;



	INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);

	INIT_LIST_HEAD(&nm_i->free_nid_list);

fs/f2fs/node.h

+3 −1
Original line number Diff line number Diff line
@@ -14,9 +14,11 @@ 
/* node block offset on the NAT area dedicated to the given start node id */

#define	NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK)



/* # of pages to perform readahead before building free nids */

/* # of pages to perform synchronous readahead before building free nids */

#define FREE_NID_PAGES 4



#define DEF_RA_NID_PAGES	4	/* # of nid pages to be readaheaded */



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

#define MAX_RA_NODE		128

fs/f2fs/super.c

+2 −0
Original line number Diff line number Diff line
@@ -213,6 +213,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); 
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);

F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);

F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);

F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);

F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);

F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);

F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, cp_interval);
@@ -232,6 +233,7 @@ static struct attribute *f2fs_attrs[] = { 
	ATTR_LIST(max_victim_search),

	ATTR_LIST(dir_level),

	ATTR_LIST(ram_thresh),

	ATTR_LIST(ra_nid_pages),

	ATTR_LIST(cp_interval),

	NULL,

};

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