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author | Sebastien Buisson <sebastien.buisson@bull.net> | 2014-10-09 15:29:38 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:26:02 -0400 |
commit | 86cf78d73de8c6bfa89804b91ee0ace71a459961 (patch) | |
tree | 2cb7facefd7c5609bde031400b8a4130da67ef21 /drivers/base | |
parent | 2c0346a36cc8ac6cb85ab585964590974c84bdf0 (diff) | |
download | op-kernel-dev-86cf78d73de8c6bfa89804b91ee0ace71a459961.zip op-kernel-dev-86cf78d73de8c6bfa89804b91ee0ace71a459961.tar.gz |
fs/buffer.c: increase the buffer-head per-CPU LRU size
Increase the buffer-head per-CPU LRU size to allow efficient filesystem
operations that access many blocks for each transaction. For example,
creating a file in a large ext4 directory with quota enabled will access
multiple buffer heads and will overflow the LRU at the default 8-block LRU
size:
* parent directory inode table block (ctime, nlinks for subdirs)
* new inode bitmap
* inode table block
* 2 quota blocks
* directory leaf block (not reused, but pollutes one cache entry)
* 2 levels htree blocks (only one is reused, other pollutes cache)
* 2 levels indirect/index blocks (only one is reused)
The buffer-head per-CPU LRU size is raised to 16, as it shows in metadata
performance benchmarks up to 10% gain for create, 4% for lookup and 7% for
destroy.
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base')
0 files changed, 0 insertions, 0 deletions