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| author | Gabriel <g2p.code+bcache@gmail.com> | 2013-04-24 19:51:02 +0200 |
|---|---|---|
| committer | Kent Overstreet <koverstreet@google.com> | 2013-05-15 00:42:52 -0700 |
| commit | fe0a797a6b42d9ad0ed063eaef705da1eb3c8147 (patch) | |
| tree | abc5916e5b4ce166248748cdd9a8624747eaf1b1 /Documentation/bcache.txt | |
| parent | bbb1c3b5ae6c6286a5e018786be88f126d769543 (diff) | |
| download | lwn-fe0a797a6b42d9ad0ed063eaef705da1eb3c8147.tar.gz lwn-fe0a797a6b42d9ad0ed063eaef705da1eb3c8147.zip | |
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: Gabriel de Perthuis <g2p.code+bcache@gmail.com>
Signed-off-by: Kent Overstreet <koverstreet@google.com>
Diffstat (limited to 'Documentation/bcache.txt')
| -rw-r--r-- | Documentation/bcache.txt | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/bcache.txt b/Documentation/bcache.txt index 77db8809bd96..b3a7e7d384f6 100644 --- a/Documentation/bcache.txt +++ b/Documentation/bcache.txt @@ -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 |