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Date: Wed, 19 Aug 2015 19:12:20 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/9] f2fs: add largest/cached stat in extent cache
This patch adds to stat the hit count of largest/cached node for showing
in debugfs.
Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
fs/f2fs/debug.c | 9 +++++++--
fs/f2fs/extent_cache.c | 14 +++++++++-----
fs/f2fs/f2fs.h | 8 +++++++-
3 files changed, 23 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index bc215fd..1a1a4c6 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -33,6 +33,8 @@ static void update_general_status(struct f2fs_sb_info *sbi)
int i;
/* validation check of the segment numbers */
+ si->hit_largest = atomic_read(&sbi->read_hit_largest);
+ si->hit_cached = atomic_read(&sbi->read_hit_cached);
si->hit_ext = atomic_read(&sbi->read_hit_ext);
si->total_ext = atomic_read(&sbi->total_hit_ext);
si->ext_tree = sbi->total_ext_tree;
@@ -279,8 +281,9 @@ static int stat_show(struct seq_file *s, void *v)
si->bg_data_blks);
seq_printf(s, " - node blocks : %d (%d)\n", si->node_blks,
si->bg_node_blks);
- seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
- si->hit_ext, si->total_ext);
+ seq_printf(s, "\nExtent Hit Ratio: L1-1:%d L1-2:%d L2:%d / %d\n",
+ si->hit_largest, si->hit_cached,
+ si->hit_ext, si->total_ext);
seq_printf(s, "\nExtent Tree Count: %d\n", si->ext_tree);
seq_printf(s, "\nExtent Node Count: %d\n", si->ext_node);
seq_puts(s, "\nBalancing F2FS Async:\n");
@@ -371,6 +374,8 @@ int f2fs_build_stats(struct f2fs_sb_info *sbi)
atomic_set(&sbi->total_hit_ext, 0);
atomic_set(&sbi->read_hit_ext, 0);
+ atomic_set(&sbi->read_hit_largest, 0);
+ atomic_set(&sbi->read_hit_cached, 0);
atomic_set(&sbi->inline_xattr, 0);
atomic_set(&sbi->inline_inode, 0);
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index cea5813..5cf217f 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -81,8 +81,8 @@ static struct extent_tree *__grab_extent_tree(struct inode *inode)
return et;
}
-static struct extent_node *__lookup_extent_tree(struct extent_tree *et,
- unsigned int fofs)
+static struct extent_node *__lookup_extent_tree(struct f2fs_sb_info *sbi,
+ struct extent_tree *et, unsigned int fofs)
{
struct rb_node *node = et->root.rb_node;
struct extent_node *en = et->cached_en;
@@ -90,8 +90,10 @@ static struct extent_node *__lookup_extent_tree(struct extent_tree *et,
if (en) {
struct extent_info *cei = &en->ei;
- if (cei->fofs <= fofs && cei->fofs + cei->len > fofs)
+ if (cei->fofs <= fofs && cei->fofs + cei->len > fofs) {
+ stat_inc_cached_node_hit(sbi);
return en;
+ }
}
while (node) {
@@ -280,10 +282,11 @@ static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
*ei = et->largest;
ret = true;
stat_inc_read_hit(sbi);
+ stat_inc_largest_node_hit(sbi);
goto out;
}
- en = __lookup_extent_tree(et, pgofs);
+ en = __lookup_extent_tree(sbi, et, pgofs);
if (en) {
*ei = en->ei;
spin_lock(&sbi->extent_lock);
@@ -313,7 +316,8 @@ out:
* tree must stay unchanged between lookup and insertion.
*/
static struct extent_node *__lookup_extent_tree_ret(struct extent_tree *et,
- unsigned int fofs, struct extent_node **prev_ex,
+ unsigned int fofs,
+ struct extent_node **prev_ex,
struct extent_node **next_ex,
struct rb_node ***insert_p,
struct rb_node **insert_parent)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 7a62f6c..632cc37 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -794,6 +794,8 @@ struct f2fs_sb_info {
atomic_t inplace_count; /* # of inplace update */
atomic_t total_hit_ext; /* # of lookup extent cache */
atomic_t read_hit_ext; /* # of hit extent cache */
+ atomic_t read_hit_largest; /* # of hit largest extent node */
+ atomic_t read_hit_cached; /* # of hit cached extent node */
atomic_t inline_xattr; /* # of inline_xattr inodes */
atomic_t inline_inode; /* # of inline_data inodes */
atomic_t inline_dir; /* # of inline_dentry inodes */
@@ -1839,7 +1841,7 @@ struct f2fs_stat_info {
struct f2fs_sb_info *sbi;
int all_area_segs, sit_area_segs, nat_area_segs, ssa_area_segs;
int main_area_segs, main_area_sections, main_area_zones;
- int hit_ext, total_ext, ext_tree, ext_node;
+ int hit_largest, hit_cached, hit_ext, total_ext, ext_tree, ext_node;
int ndirty_node, ndirty_dent, ndirty_dirs, ndirty_meta;
int nats, dirty_nats, sits, dirty_sits, fnids;
int total_count, utilization;
@@ -1877,6 +1879,8 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
#define stat_dec_dirty_dir(sbi) ((sbi)->n_dirty_dirs--)
#define stat_inc_total_hit(sbi) (atomic_inc(&(sbi)->total_hit_ext))
#define stat_inc_read_hit(sbi) (atomic_inc(&(sbi)->read_hit_ext))
+#define stat_inc_largest_node_hit(sbi) (atomic_inc(&(sbi)->read_hit_largest))
+#define stat_inc_cached_node_hit(sbi) (atomic_inc(&(sbi)->read_hit_cached))
#define stat_inc_inline_xattr(inode) \
do { \
if (f2fs_has_inline_xattr(inode)) \
@@ -1957,6 +1961,8 @@ void f2fs_destroy_root_stats(void);
#define stat_dec_dirty_dir(sbi)
#define stat_inc_total_hit(sb)
#define stat_inc_read_hit(sb)
+#define stat_inc_largest_node_hit(sbi)
+#define stat_inc_cached_node_hit(sbi)
#define stat_inc_inline_xattr(inode)
#define stat_dec_inline_xattr(inode)
#define stat_inc_inline_inode(inode)
--
2.4.2
--
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