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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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9
fs/f2fs/segment.c
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@@ -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);