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f2fs: readahead contiguous SSA blocks for f2fs_gc

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If there are multi segments in one section, we will read those SSA blocks which
have contiguous address one by one in f2fs_gc. It may lost performance, let's
read ahead SSA blocks by merge multi read request.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Chao Yu 2014-02-27 19:12:24 +08:00 committed by Jaegeuk Kim
parent ab9fa662e4
commit 81c1a0f13e
3 changed files with 12 additions and 4 deletions
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6
fs/f2fs/checkpoint.c
View file

@ -82,6 +82,7 @@ inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
return NM_I(sbi)->max_nid / NAT_ENTRY_PER_BLOCK;
case META_SIT:
return SIT_BLK_CNT(sbi);
case META_SSA:
case META_CP:
return 0;
default:
@ -90,7 +91,7 @@ inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
}
/*
* Readahead CP/NAT/SIT pages
* Readahead CP/NAT/SIT/SSA pages
*/
int ra_meta_pages(struct f2fs_sb_info *sbi, int start, int nrpages, int type)
{
@ -125,8 +126,9 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, int start, int nrpages, int type)
goto out;
prev_blk_addr = blk_addr;
break;
case META_SSA:
case META_CP:
/* get cp block addr */
/* get ssa/cp block addr */
blk_addr = blkno;
break;
default:

5
fs/f2fs/f2fs.h
View file

@ -89,12 +89,13 @@ enum {
};
/*
* For CP/NAT/SIT readahead
* For CP/NAT/SIT/SSA readahead
*/
enum {
META_CP,
META_NAT,
META_SIT
META_SIT,
META_SSA
};
/* for the list of orphan inodes */

5
fs/f2fs/gc.c
View file

@ -708,6 +708,11 @@ gc_more:
goto stop;
ret = 0;
/* readahead multi ssa blocks those have contiguous address */
if (sbi->segs_per_sec > 1)
ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno), sbi->segs_per_sec,
META_SSA);
for (i = 0; i < sbi->segs_per_sec; i++)
do_garbage_collect(sbi, segno + i, &ilist, gc_type);