f2fs: export dirty_nats_ratio in sysfs

This patch exports a new sysfs entry 'dirty_nat_ratio' to control threshold
of dirty nat entries, if current ratio exceeds configured threshold,
checkpoint will be triggered in f2fs_balance_fs_bg for flushing dirty nats.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index e5200f354abfe933d3fbe69f919da2dcc0e585a6..523cb9d4e27236eb2c4e2c18309992e6893e5a8e 100644 (file)
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -98,3 +98,11 @@ Date:                October 2015
 Contact:       "Chao Yu" <chao2.yu@samsung.com>
 Description:
                 Controls the count of nid pages to be readaheaded.
+
+What:          /sys/fs/f2fs/<disk>/dirty_nats_ratio
+Date:          January 2016
+Contact:       "Chao Yu" <chao2.yu@samsung.com>
+Description:
+                Controls dirty nat entries ratio threshold, if current
+                ratio exceeds configured threshold, checkpoint will
+                be triggered for flushing dirty nat entries.

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e41ffc1f54d1b65d6e871c8657f72c64dec81d76..6c08cb1fd3405a8d57c1c5fffa2820aa09761710 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -515,6 +515,7 @@ struct f2fs_nm_info {
        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 */
+       unsigned int dirty_nats_ratio;  /* control dirty nats ratio threshold */
 
        /* NAT cache management */
        struct radix_tree_root nat_root;/* root of the nat entry cache */

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 342597a5897f059a2d31823923d8664861b7b969..63692819522466006818bf1a7d15cd8eadca5097 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2000,6 +2000,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
        nm_i->nat_cnt = 0;
        nm_i->ram_thresh = DEF_RAM_THRESHOLD;
        nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
+       nm_i->dirty_nats_ratio = DEF_DIRTY_NAT_RATIO_THRESHOLD;
 
        INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
        INIT_LIST_HEAD(&nm_i->free_nid_list);

diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index bd119c0edf93cc8e3a4c694f7072c57625e0703e..56c45192152210e4d53ec0a16ae9583e83bfe456 100644 (file)
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -123,7 +123,7 @@ static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
 static inline bool excess_dirty_nats(struct f2fs_sb_info *sbi)
 {
        return NM_I(sbi)->dirty_nat_cnt >= NM_I(sbi)->max_nid *
-                                       DEF_DIRTY_NAT_RATIO_THRESHOLD / 100;
+                                       NM_I(sbi)->dirty_nats_ratio / 100;
 }
 
 enum mem_type {

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 6134832baaaf0b25a86ed9cec1e8121b3ba3e4e2..0ea5bcccab6d0306608d5861e7a0edccfc55a0ff 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -216,6 +216,7 @@ 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(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 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, interval_time[CP_TIME]);
@@ -237,6 +238,7 @@ static struct attribute *f2fs_attrs[] = {
        ATTR_LIST(dir_level),
        ATTR_LIST(ram_thresh),
        ATTR_LIST(ra_nid_pages),
+       ATTR_LIST(dirty_nats_ratio),
        ATTR_LIST(cp_interval),
        ATTR_LIST(idle_interval),
        NULL,