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f2fs: allocate node and hot data in the beginning of partition

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In order to give more spatial locality, this patch changes the block allocation
policy which assigns beginning of partition for small and hot data/node blocks.
In order to do this, we set noheap allocation by default and introduce another
mount option, heap, to reset it back.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2017-03-24 20:41:45 -04:00
parent c541a51b8c
commit 7a20b8a61e
3 changed files with 23 additions and 2 deletions
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6
fs/f2fs/gc.c
View File

@ -172,7 +172,11 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
if (gc_type != FG_GC && p->max_search > sbi->max_victim_search)
p->max_search = sbi->max_victim_search;
p->offset = sbi->last_victim[p->gc_mode];
/* let's select beginning hot/small space first */
if (type == CURSEG_HOT_DATA || IS_NODESEG(type))
p->offset = 0;
else
p->offset = sbi->last_victim[p->gc_mode];
}
static unsigned int get_max_cost(struct f2fs_sb_info *sbi,

9
fs/f2fs/segment.c
View File

@ -1519,6 +1519,14 @@ static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
__set_sit_entry_type(sbi, type, curseg->segno, modified);
}
static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
{
if (type == CURSEG_HOT_DATA || IS_NODESEG(type))
return 0;
return CURSEG_I(sbi, type)->segno;
}
/*
* Allocate a current working segment.
* This function always allocates a free segment in LFS manner.
@ -1537,6 +1545,7 @@ static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
if (test_opt(sbi, NOHEAP))
dir = ALLOC_RIGHT;
segno = __get_next_segno(sbi, type);
get_new_segment(sbi, &segno, new_sec, dir);
curseg->next_segno = segno;
reset_curseg(sbi, type, 1);

10
fs/f2fs/super.c
View File

@ -83,6 +83,7 @@ enum {
Opt_discard,
Opt_nodiscard,
Opt_noheap,
Opt_heap,
Opt_user_xattr,
Opt_nouser_xattr,
Opt_acl,
@ -117,6 +118,7 @@ static match_table_t f2fs_tokens = {
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
{Opt_noheap, "no_heap"},
{Opt_heap, "heap"},
{Opt_user_xattr, "user_xattr"},
{Opt_nouser_xattr, "nouser_xattr"},
{Opt_acl, "acl"},
@ -437,6 +439,9 @@ static int parse_options(struct super_block *sb, char *options)
case Opt_noheap:
set_opt(sbi, NOHEAP);
break;
case Opt_heap:
clear_opt(sbi, NOHEAP);
break;
#ifdef CONFIG_F2FS_FS_XATTR
case Opt_user_xattr:
set_opt(sbi, XATTR_USER);
@ -914,7 +919,9 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
if (test_opt(sbi, DISCARD))
seq_puts(seq, ",discard");
if (test_opt(sbi, NOHEAP))
seq_puts(seq, ",no_heap_alloc");
seq_puts(seq, ",no_heap");
else
seq_puts(seq, ",heap");
#ifdef CONFIG_F2FS_FS_XATTR
if (test_opt(sbi, XATTR_USER))
seq_puts(seq, ",user_xattr");
@ -1047,6 +1054,7 @@ static void default_options(struct f2fs_sb_info *sbi)
set_opt(sbi, INLINE_DATA);
set_opt(sbi, INLINE_DENTRY);
set_opt(sbi, EXTENT_CACHE);
set_opt(sbi, NOHEAP);
sbi->sb->s_flags |= MS_LAZYTIME;
set_opt(sbi, FLUSH_MERGE);
if (f2fs_sb_mounted_blkzoned(sbi->sb)) {