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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: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-10-12 17:08:48 +08:00 committed by Jaegeuk Kim
parent 2db2388fcf
commit ea1a29a0bd
5 changed files with 14 additions and 2 deletions
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6
Documentation/ABI/testing/sysfs-fs-f2fs
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@ -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.

1
fs/f2fs/f2fs.h
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@ -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 */

3
fs/f2fs/node.c
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@ -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);

4
fs/f2fs/node.h
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@ -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

2
fs/f2fs/super.c
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@ -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,
};