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f2fs: combine nat_bits and free_nid_bitmap cache
Both nat_bits cache and free_nid_bitmap cache provide same functionality as a intermediate cache between free nid cache and disk, but with different granularity of indicating free nid range, and different persistence policy. nat_bits cache provides better persistence ability, and free_nid_bitmap provides better granularity. In this patch we combine advantage of both caches, so finally policy of the intermediate cache would be: - init: load free nid status from nat_bits into free_nid_bitmap - lookup: scan free_nid_bitmap before load NAT blocks - update: update free_nid_bitmap in real-time - persistence: udpate and persist nat_bits in checkpoint This patch also resolves performance regression reported by lkp-robot. commit:4ac912427c("f2fs: introduce free nid bitmap") d00030cf9cd0bb96fdccc41e33d3c91dcbb672ba ("f2fs: use __set{__clear}_bit_le") 1382c0f3f9d3f936c8bc42ed1591cf7a593ef9f7 ("f2fs: combine nat_bits and free_nid_bitmap cache")4ac912427cd00030cf9cd0bb96fdccc41e33 1382c0f3f9d3f936c8bc42ed15 ---------------- -------------------------- -------------------------- %stddev %change %stddev %change %stddev \ | \ | \ 77863 ± 0% +2.1% 79485 ± 1% +50.8% 117404 ± 0% aim7.jobs-per-min 231.63 ± 0% -2.0% 227.01 ± 1% -33.6% 153.80 ± 0% aim7.time.elapsed_time 231.63 ± 0% -2.0% 227.01 ± 1% -33.6% 153.80 ± 0% aim7.time.elapsed_time.max 896604 ± 0% -0.8% 889221 ± 3% -20.2% 715260 ± 1% aim7.time.involuntary_context_switches 2394 ± 1% +4.6% 2503 ± 1% +3.7% 2481 ± 2% aim7.time.maximum_resident_set_size 6240 ± 0% -1.5% 6145 ± 1% -14.1% 5360 ± 1% aim7.time.system_time 1111357 ± 3% +1.9% 1132509 ± 2% -6.2% 1041932 ± 2% aim7.time.voluntary_context_switches ... Signed-off-by: Chao Yu <yuchao0@huawei.com> Tested-by: Xiaolong Ye <xiaolong.ye@intel.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
Jaegeuk Kim
parent
586d1492f3
commit
7041d5d286
125
fs/f2fs/node.c
125
fs/f2fs/node.c
@ -338,9 +338,6 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
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set_nat_flag(e, IS_CHECKPOINTED, false);
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__set_nat_cache_dirty(nm_i, e);
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if (enabled_nat_bits(sbi, NULL) && new_blkaddr == NEW_ADDR)
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__clear_bit_le(NAT_BLOCK_OFFSET(ni->nid), nm_i->empty_nat_bits);
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/* update fsync_mark if its inode nat entry is still alive */
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if (ni->nid != ni->ino)
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e = __lookup_nat_cache(nm_i, ni->ino);
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@ -1824,7 +1821,7 @@ static void remove_free_nid(struct f2fs_sb_info *sbi, nid_t nid)
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}
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static void update_free_nid_bitmap(struct f2fs_sb_info *sbi, nid_t nid,
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bool set, bool build)
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bool set, bool build, bool locked)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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unsigned int nat_ofs = NAT_BLOCK_OFFSET(nid);
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@ -1838,12 +1835,14 @@ static void update_free_nid_bitmap(struct f2fs_sb_info *sbi, nid_t nid,
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else
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__clear_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs]);
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spin_lock(&nm_i->free_nid_lock);
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if (!locked)
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spin_lock(&nm_i->free_nid_lock);
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if (set)
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nm_i->free_nid_count[nat_ofs]++;
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else if (!build)
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nm_i->free_nid_count[nat_ofs]--;
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spin_unlock(&nm_i->free_nid_lock);
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if (!locked)
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spin_unlock(&nm_i->free_nid_lock);
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}
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static void scan_nat_page(struct f2fs_sb_info *sbi,
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@ -1872,7 +1871,7 @@ static void scan_nat_page(struct f2fs_sb_info *sbi,
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f2fs_bug_on(sbi, blk_addr == NEW_ADDR);
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if (blk_addr == NULL_ADDR)
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freed = add_free_nid(sbi, start_nid, true);
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update_free_nid_bitmap(sbi, start_nid, freed, true);
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update_free_nid_bitmap(sbi, start_nid, freed, true, false);
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}
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}
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@ -1920,58 +1919,6 @@ out:
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up_read(&nm_i->nat_tree_lock);
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}
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static int scan_nat_bits(struct f2fs_sb_info *sbi)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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struct page *page;
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unsigned int i = 0;
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nid_t nid;
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if (!enabled_nat_bits(sbi, NULL))
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return -EAGAIN;
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down_read(&nm_i->nat_tree_lock);
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check_empty:
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i = find_next_bit_le(nm_i->empty_nat_bits, nm_i->nat_blocks, i);
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if (i >= nm_i->nat_blocks) {
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i = 0;
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goto check_partial;
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}
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for (nid = i * NAT_ENTRY_PER_BLOCK; nid < (i + 1) * NAT_ENTRY_PER_BLOCK;
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nid++) {
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if (unlikely(nid >= nm_i->max_nid))
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break;
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add_free_nid(sbi, nid, true);
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}
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if (nm_i->nid_cnt[FREE_NID_LIST] >= MAX_FREE_NIDS)
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goto out;
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i++;
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goto check_empty;
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check_partial:
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i = find_next_zero_bit_le(nm_i->full_nat_bits, nm_i->nat_blocks, i);
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if (i >= nm_i->nat_blocks) {
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disable_nat_bits(sbi, true);
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up_read(&nm_i->nat_tree_lock);
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return -EINVAL;
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}
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nid = i * NAT_ENTRY_PER_BLOCK;
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page = get_current_nat_page(sbi, nid);
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scan_nat_page(sbi, page, nid);
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f2fs_put_page(page, 1);
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if (nm_i->nid_cnt[FREE_NID_LIST] < MAX_FREE_NIDS) {
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i++;
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goto check_partial;
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}
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out:
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up_read(&nm_i->nat_tree_lock);
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return 0;
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}
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static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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@ -1993,21 +1940,6 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
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if (nm_i->nid_cnt[FREE_NID_LIST])
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return;
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/* try to find free nids with nat_bits */
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if (!scan_nat_bits(sbi) && nm_i->nid_cnt[FREE_NID_LIST])
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return;
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}
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/* find next valid candidate */
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if (enabled_nat_bits(sbi, NULL)) {
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int idx = find_next_zero_bit_le(nm_i->full_nat_bits,
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nm_i->nat_blocks, 0);
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if (idx >= nm_i->nat_blocks)
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set_sbi_flag(sbi, SBI_NEED_FSCK);
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else
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nid = idx * NAT_ENTRY_PER_BLOCK;
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}
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/* readahead nat pages to be scanned */
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@ -2094,7 +2026,7 @@ retry:
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__insert_nid_to_list(sbi, i, ALLOC_NID_LIST, false);
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nm_i->available_nids--;
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update_free_nid_bitmap(sbi, *nid, false, false);
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update_free_nid_bitmap(sbi, *nid, false, false, false);
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spin_unlock(&nm_i->nid_list_lock);
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return true;
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@ -2150,7 +2082,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
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nm_i->available_nids++;
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update_free_nid_bitmap(sbi, nid, true, false);
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update_free_nid_bitmap(sbi, nid, true, false, false);
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spin_unlock(&nm_i->nid_list_lock);
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@ -2480,11 +2412,11 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
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add_free_nid(sbi, nid, false);
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spin_lock(&NM_I(sbi)->nid_list_lock);
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NM_I(sbi)->available_nids++;
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update_free_nid_bitmap(sbi, nid, true, false);
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update_free_nid_bitmap(sbi, nid, true, false, false);
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spin_unlock(&NM_I(sbi)->nid_list_lock);
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} else {
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spin_lock(&NM_I(sbi)->nid_list_lock);
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update_free_nid_bitmap(sbi, nid, false, false);
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update_free_nid_bitmap(sbi, nid, false, false, false);
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spin_unlock(&NM_I(sbi)->nid_list_lock);
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}
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}
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@ -2590,6 +2522,40 @@ static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
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return 0;
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}
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inline void load_free_nid_bitmap(struct f2fs_sb_info *sbi)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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unsigned int i = 0;
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nid_t nid, last_nid;
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if (!enabled_nat_bits(sbi, NULL))
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return;
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for (i = 0; i < nm_i->nat_blocks; i++) {
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i = find_next_bit_le(nm_i->empty_nat_bits, nm_i->nat_blocks, i);
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if (i >= nm_i->nat_blocks)
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break;
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__set_bit_le(i, nm_i->nat_block_bitmap);
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nid = i * NAT_ENTRY_PER_BLOCK;
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last_nid = (i + 1) * NAT_ENTRY_PER_BLOCK;
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spin_lock(&nm_i->free_nid_lock);
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for (; nid < last_nid; nid++)
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update_free_nid_bitmap(sbi, nid, true, true, true);
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spin_unlock(&nm_i->free_nid_lock);
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}
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for (i = 0; i < nm_i->nat_blocks; i++) {
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i = find_next_bit_le(nm_i->full_nat_bits, nm_i->nat_blocks, i);
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if (i >= nm_i->nat_blocks)
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break;
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__set_bit_le(i, nm_i->nat_block_bitmap);
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}
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}
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static int init_node_manager(struct f2fs_sb_info *sbi)
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{
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struct f2fs_super_block *sb_raw = F2FS_RAW_SUPER(sbi);
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@ -2691,6 +2657,9 @@ int build_node_manager(struct f2fs_sb_info *sbi)
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if (err)
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return err;
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/* load free nid status from nat_bits table */
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load_free_nid_bitmap(sbi);
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build_free_nids(sbi, true, true);
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return 0;
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}
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