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bcache: clarify free/available/unused space

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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: Gabriel de Perthuis <g2p.code+bcache@gmail.com>
Signed-off-by: Kent Overstreet <koverstreet@google.com>
This commit is contained in:
Gabriel 2013-04-24 19:51:02 +02:00 committed by Kent Overstreet
parent bbb1c3b5ae
commit fe0a797a6b
1 changed files with 9 additions and 3 deletions
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12
Documentation/bcache.txt
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@ -319,7 +319,10 @@ cache<0..n>
Symlink to each of the cache devices comprising this cache set. Symlink to each of the cache devices comprising this cache set.
cache_available_percent 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 clear_stats
Clears the statistics associated with this cache Clears the statistics associated with this cache
@ -423,8 +426,11 @@ nbuckets
Total buckets in this cache Total buckets in this cache
priority_stats priority_stats
Statistics about how recently data in the cache has been accessed. This can Statistics about how recently data in the cache has been accessed.
reveal your working set size. 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 written
Sum of all data that has been written to the cache; comparison with Sum of all data that has been written to the cache; comparison with