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authorJaegeuk Kim <jaegeuk@kernel.org>2022-12-01 17:37:15 -0800
committerJaegeuk Kim <jaegeuk@kernel.org>2022-12-12 14:53:56 -0800
commit71644dff481180ba024ac4f5cb1f068756357adf (patch)
tree516306a1d5e1013e4504e91b05cdfd15e8c61e11 /fs/f2fs/file.c
parent72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a (diff)
f2fs: add block_age-based extent cache
This patch introduces a runtime hot/cold data separation method for f2fs, in order to improve the accuracy for data temperature classification, reduce the garbage collection overhead after long-term data updates. Enhanced hot/cold data separation can record data block update frequency as "age" of the extent per inode, and take use of the age info to indicate better temperature type for data block allocation: - It records total data blocks allocated since mount; - When file extent has been updated, it calculate the count of data blocks allocated since last update as the age of the extent; - Before the data block allocated, it searches for the age info and chooses the suitable segment for allocation. Test and result: - Prepare: create about 30000 files * 3% for cold files (with cold file extension like .apk, from 3M to 10M) * 50% for warm files (with random file extension like .FcDxq, from 1K to 4M) * 47% for hot files (with hot file extension like .db, from 1K to 256K) - create(5%)/random update(90%)/delete(5%) the files * total write amount is about 70G * fsync will be called for .db files, and buffered write will be used for other files The storage of test device is large enough(128G) so that it will not switch to SSR mode during the test. Benefit: dirty segment count increment reduce about 14% - before: Dirty +21110 - after: Dirty +18286 Signed-off-by: qixiaoyu1 <qixiaoyu1@xiaomi.com> Signed-off-by: xiongping1 <xiongping1@xiaomi.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/file.c')
-rw-r--r--fs/f2fs/file.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index cbe7c24065c7..56c23b5e9d65 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -619,6 +619,7 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
fofs = f2fs_start_bidx_of_node(ofs_of_node(dn->node_page),
dn->inode) + ofs;
f2fs_update_read_extent_cache_range(dn, fofs, 0, len);
+ f2fs_update_age_extent_cache_range(dn, fofs, nr_free);
dec_valid_block_count(sbi, dn->inode, nr_free);
}
dn->ofs_in_node = ofs;