Re: [PATCH] distributed counters for ext2 to avoid group scaning

[William Lee Irwin III <wli@holomorphy.com>]

On Sun, Mar 16, 2003 at 06:01:55PM +0300, Alex Tomas wrote:
>> ext2 with concurrent balloc/ialloc doesn't maintain global free
>> inodes/blocks counters. this is due to badness of spinlocks and
>> atomic_t from big iron's viewpoint. therefore, to know these values
>> we should scan all group descriptors.  there are 81 groups for 10G
>> fs. I believe there is method to avoid scaning and decrease memory
>> footprint. 

On Mon, Mar 17, 2003 at 01:37:12AM -0800, William Lee Irwin III wrote:
> benching now

Bad news. I don't have big enough fs's to do this one. Working it...

$ df -HT
Filesystem    Type     Size   Used  Avail Use% Mounted on
/dev/sda2     ext2     4.2G   2.8G   1.2G  72% /
/dev/sdb1     ext2     9.1G   7.0G   1.6G  82% /home
/dev/sdb2     ext2     9.1G    42M   8.6G   1% /results
/dev/sdd1     ext2      19G   8.0G   9.2G  47% /work
/dev/sde1     ext2      19G   1.7G    16G  10% /test
$ 

-- wli