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authorChao Yu <yuchao0@huawei.com>2017-02-23 10:53:49 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2017-02-27 10:07:47 -0800
commit4ac912427c4214d8031d9ad6fbc3bc75e71512df (patch)
treed1724cb87c35b2b83fa2b8d4da4a0e9ecd64e9af /fs/f2fs/debug.c
parentced2c7ea8e99b46755a270872cd5ba61c27cffad (diff)
f2fs: introduce free nid bitmap
In scenario of intensively node allocation, free nids will be ran out soon, then it needs to stop to load free nids by traversing NAT blocks, in worse case, if NAT blocks does not be cached in memory, it generates IOs which slows down our foreground operations. In order to speed up node allocation, in this patch we introduce a new free_nid_bitmap array, so there is an bitmap table for each NAT block, Once the NAT block is loaded, related bitmap cache will be switched on, and bitmap will be set during traversing nat entries in NAT block, later we can query and update nid usage status in memory completely. With such implementation, I expect performance of node allocation can be improved in the long-term after filesystem image is mounted. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/debug.c')
-rw-r--r--fs/f2fs/debug.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 015ad2b73a92..a77df377e2e8 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -194,6 +194,8 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
si->base_mem += sizeof(struct f2fs_nm_info);
si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
si->base_mem += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS);
+ si->base_mem += NM_I(sbi)->nat_blocks * NAT_ENTRY_BITMAP_SIZE;
+ si->base_mem += NM_I(sbi)->nat_blocks / 8;
get_cache:
si->cache_mem = 0;