Guidance for writing policies ============================= Try to keep transactionality out of it. The core is careful to avoid asking about anything that is migrating. This is a pain, but makes it easier to write the policies. Mappings are loaded into the policy at construction time. Every bio that is mapped by the target is referred to the policy. The policy can return a simple HIT or MISS or issue a migration. Currently there's no way for the policy to issue background work, e.g. to start writing back dirty blocks that are going to be evicte soon. Because we map bios, rather than requests it's easy for the policy to get fooled by many small bios. For this reason the core target issues periodic ticks to the policy. It's suggested that the policy doesn't update states (eg, hit counts) for a block more than once for each tick. The core ticks by watching bios complete, and so trying to see when the io scheduler has let the ios run. Overview of supplied cache replacement policies =============================================== multiqueue (mq) --------------- This policy has been deprecated in favor of the smq policy (see below). The multiqueue policy has three sets of 16 queues: one set for entries waiting for the cache and another two for those in the cache (a set for clean entries and a set for dirty entries). Cache entries in the queues are aged based on logical time. Entry into the cache is based on variable thresholds and queue selection is based on hit count on entry. The policy aims to take different cache miss costs into account and to adjust to varying load patterns automatically. Message and constructor argument pairs are: 'sequential_threshold <#nr_sequential_ios>' 'random_threshold <#nr_random_ios>' 'read_promote_adjustment ' 'write_promote_adjustment ' 'discard_promote_adjustment ' The sequential threshold indicates the number of contiguous I/Os required before a stream is treated as sequential. Once a stream is considered sequential it will bypass the cache. The random threshold is the number of intervening non-contiguous I/Os that must be seen before the stream is treated as random again. The sequential and random thresholds default to 512 and 4 respectively. Large, sequential I/Os are probably better left on the origin device since spindles tend to have good sequential I/O bandwidth. The io_tracker counts contiguous I/Os to try to spot when the I/O is in one of these sequential modes. But there are use-cases for wanting to promote sequential blocks to the cache (e.g. fast application startup). If sequential threshold is set to 0 the sequential I/O detection is disabled and sequential I/O will no longer implicitly bypass the cache. Setting the random threshold to 0 does _not_ disable the random I/O stream detection. Internally the mq policy determines a promotion threshold. If the hit count of a block not in the cache goes above this threshold it gets promoted to the cache. The read, write and discard promote adjustment tunables allow you to tweak the promotion threshold by adding a small value based on the io type. They default to 4, 8 and 1 respectively. If you're trying to quickly warm a new cache device you may wish to reduce these to encourage promotion. Remember to switch them back to their defaults after the cache fills though. Stochastic multiqueue (smq) --------------------------- This policy is the default. The stochastic multi-queue (smq) policy addresses some of the problems with the multiqueue (mq) policy. The smq policy (vs mq) offers the promise of less memory utilization, improved performance and increased adaptability in the face of changing workloads. SMQ also does not have any cumbersome tuning knobs. Users may switch from "mq" to "smq" simply by appropriately reloading a DM table that is using the cache target. Doing so will cause all of the mq policy's hints to be dropped. Also, performance of the cache may degrade slightly until smq recalculates the origin device's hotspots that should be cached. Memory usage: The mq policy uses a lot of memory; 88 bytes per cache block on a 64 bit machine. SMQ uses 28bit indexes to implement it's data structures rather than pointers. It avoids storing an explicit hit count for each block. It has a 'hotspot' queue rather than a pre cache which uses a quarter of the entries (each hotspot block covers a larger area than a single cache block). All these mean smq uses ~25bytes per cache block. Still a lot of memory, but a substantial improvement nontheless. Level balancing: MQ places entries in different levels of the multiqueue structures based on their hit count (~ln(hit count)). This means the bottom levels generally have the most entries, and the top ones have very few. Having unbalanced levels like this reduces the efficacy of the multiqueue. SMQ does not maintain a hit count, instead it swaps hit entries with the least recently used entry from the level above. The over all ordering being a side effect of this stochastic process. With this scheme we can decide how many entries occupy each multiqueue level, resulting in better promotion/demotion decisions. Adaptability: The MQ policy maintains a hit count for each cache block. For a different block to get promoted to the cache it's hit count has to exceed the lowest currently in the cache. This means it can take a long time for the cache to adapt between varying IO patterns. Periodically degrading the hit counts could help with this, but I haven't found a nice general solution. SMQ doesn't maintain hit counts, so a lot of this problem just goes away. In addition it tracks performance of the hotspot queue, which is used to decide which blocks to promote. If the hotspot queue is performing badly then it starts moving entries more quickly between levels. This lets it adapt to new IO patterns very quickly. Performance: Testing SMQ shows substantially better performance than MQ. cleaner ------- The cleaner writes back all dirty blocks in a cache to decommission it. Examples ======== The syntax for a table is: cache <#feature_args> []* <#policy_args> []* The syntax to send a message using the dmsetup command is: dmsetup message 0 sequential_threshold 1024 dmsetup message 0 random_threshold 8 Using dmsetup: dmsetup create blah --table "0 268435456 cache /dev/sdb /dev/sdc \ /dev/sdd 512 0 mq 4 sequential_threshold 1024 random_threshold 8" creates a 128GB large mapped device named 'blah' with the sequential threshold set to 1024 and the random_threshold set to 8.