Re: [dm-devel] [PATCHES] convert dm-thin to use dm-bufio

[Joe Thornber <thornber redhat com>]

On Tue, Aug 16, 2011 at 06:03:00PM -0400, Mikulas Patocka wrote:
> The working set is 2% of memory or 1/4 of vmalloc space (whichever is 
> smaller). This can be changed in 
> "/sys/module/dm_bufio/parameters/dm_bufio_cache_size".
> 
> Buffers are freed when they are unused for 60 seconds (can be changed in 
> "/sys/module/dm_bufio/parameters/dm_bufio_max_age").
> 
> Total size is divided by the number of active clients using dm-bufio. So 
> that each client gets a fair share.
> 
> Writeback is done on commit. When 3/4 of the cache size is used, 
> background writeback is started.

This all sounds good; get the locking interface in and I'll switch to
bufio straight away.

- Joe