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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-14 15:54:27 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-20 10:05:50 +0900
commitdb38d5ad323362bfca118b52fe5906f97a69fb45 (patch)
tree11940fedf0eb0ff80527094bd435ec89641f8adc /fs/nilfs2/mdt.c
parent141bbdba9c2c1592d56b019277774099a5412aea (diff)
downloadlinux-db38d5ad323362bfca118b52fe5906f97a69fb45.tar.gz
nilfs2: add cache framework for persistent object allocator
This adds setup and cleanup routines of the persistent object allocator cache. According to ftrace analyses, accessing buffers of the DAT file suffers indispensable overhead many times. To mitigate the overhead, This introduce cache framework for the persistent object allocator (palloc) which the DAT file and ifile are using. struct nilfs_palloc_cache represents the cache object per metadata file using palloc. The cache is initialized through nilfs_palloc_setup_cache() and destroyed by nilfs_palloc_destroy_cache(); callers of the former function will be added to individual allocators of DAT and ifile on successive patches. nilfs_palloc_destroy_cache() will be called from nilfs_mdt_destroy() if the cache is attached to a metadata file. A companion function nilfs_palloc_clear_cache() is provided to allow releasing buffer head references independently with the cleanup task. This adjunctive function will be used before invalidating pages of metadata file with the cache. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/mdt.c')
-rw-r--r--fs/nilfs2/mdt.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 948b1f8bc50..06713ffcc7f 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -571,6 +571,8 @@ void nilfs_mdt_destroy(struct inode *inode)
{
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
+ if (mdi->mi_palloc_cache)
+ nilfs_palloc_destroy_cache(inode);
nilfs_mdt_clear(inode);
kfree(mdi->mi_bgl); /* kfree(NULL) is safe */