[dm-devel] [PATCH 0/5] use global replacement for dm-bufio buffers

[Mikulas Patocka]

dm-bufio divides the size of cache by the number of clients and uses it as
a per-client limit. However, this is suboptimal when there is large amount
of clients.

This patch set introduces global buffer replacement. All the buffers from
all the clients are put to a global queue and dm-bufio cleans up old
buffers in the queue.

This improves cache utilization - if one dm-bufio client uses the cache
heavily and another dm-bufio client is not using the cache, dm-bufio will
prefer caching buffers from the first client (instead of partitioning the
cache equally between the first and second client).