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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-07-23 14:14:05 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2008-07-23 14:14:05 -0400 |
| commit | 6be2ded1d7c51b39144b9f07d2c839e1bd8707f1 (patch) | |
| tree | aed3b1a8a0ebb8d62152a469953d970926988392 /fs/jbd2/commit.c | |
| parent | ext4: Convert the usage of NR_CPUS to nr_cpu_ids. (diff) | |
| download | wireguard-linux-6be2ded1d7c51b39144b9f07d2c839e1bd8707f1.tar.xz wireguard-linux-6be2ded1d7c51b39144b9f07d2c839e1bd8707f1.zip | |
ext4: Don't allow lg prealloc list to be grow large.
Currently, the locality group prealloc list is freed only when there
is a block allocation failure. This can result in large number of
entries in the preallocation list making ext4_mb_use_preallocated()
expensive.
To fix this, we convert the locality group prealloc list to a hash
list. The hash index is the order of number of blocks in the prealloc
space with a max order of 9. When adding prealloc space to the list we
make sure total entries for each order does not exceed 8. If it is
more than 8 we discard few entries and make sure the we have only <= 5
entries.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/commit.c')
0 files changed, 0 insertions, 0 deletions