f2fs: introduce inmem curseg

Previous implementation of aligned pinfile allocation will:
- allocate new segment on cold data log no matter whether last used
segment is partially used or not, it makes IOs more random;
- force concurrent cold data/GCed IO going into warm data area, it
can make a bad effect on hot/cold data separation;

In this patch, we introduce a new type of log named 'inmem curseg',
the differents from normal curseg is:
- it reuses existed segment type (CURSEG_XXX_NODE/DATA);
- it only exists in memory, its segno, blkofs, summary will not b
 persisted into checkpoint area;

With this new feature, we can enhance scalability of log, special
allocators can be created for purposes:
- pure lfs allocator for aligned pinfile allocation or file
defragmentation
- pure ssr allocator for later feature

So that, let's update aligned pinfile allocation to use this new
inmem curseg fwk.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2020-08-04 21:14:45 +08:00
committed by Jaegeuk Kim
parent 376207af4b
commit d0b9e42ab6
8 changed files with 113 additions and 52 deletions

View File

@@ -1619,11 +1619,16 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
f2fs_flush_sit_entries(sbi, cpc);
/* save inmem log status */
f2fs_save_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
err = do_checkpoint(sbi, cpc);
if (err)
f2fs_release_discard_addrs(sbi);
else
f2fs_clear_prefree_segments(sbi, cpc);
f2fs_restore_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
stop:
unblock_operations(sbi);
stat_inc_cp_count(sbi->stat_info);
@@ -1654,7 +1659,7 @@ void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
}
sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
NR_CURSEG_TYPE - __cp_payload(sbi)) *
NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) *
F2FS_ORPHANS_PER_BLOCK;
}