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Commit fe0a797a authored by Gabriel's avatar Gabriel Committed by Kent Overstreet
Browse files

bcache: clarify free/available/unused space 



Don't describe bcache_available_percent as free space but as
non-writeback space.  Describe priority_stats in more detail
and point to that for total bcache occupation.

Signed-off-by: default avatarGabriel de Perthuis <g2p.code+bcache@gmail.com>
Signed-off-by: default avatarKent Overstreet <koverstreet@google.com>
parent bbb1c3b5

Documentation/bcache.txt

+9 −3
Original line number Diff line number Diff line
@@ -319,7 +319,10 @@ cache<0..n> 
  Symlink to each of the cache devices comprising this cache set. 



cache_available_percent

  Percentage of cache device free.

  Percentage of cache device which doesn't contain dirty data, and could

  potentially be used for writeback.  This doesn't mean this space isn't used

  for clean cached data; the unused statistic (in priority_stats) is typically

  much lower.



clear_stats

  Clears the statistics associated with this cache
@@ -423,8 +426,11 @@ nbuckets 
  Total buckets in this cache



priority_stats

  Statistics about how recently data in the cache has been accessed.  This can

  reveal your working set size.

  Statistics about how recently data in the cache has been accessed.

  This can reveal your working set size.  Unused is the percentage of

  the cache that doesn't contain any data.  Metadata is bcache's

  metadata overhead.  Average is the average priority of cache buckets.

  Next is a list of quantiles with the priority threshold of each.



written

  Sum of all data that has been written to the cache; comparison with