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Chen Tianjie authored
Sometimes we need to make fast judgement about why Redis is suddenly taking more memory. One of the reasons is main DB's dicts doing rehashing. We may use `MEMORY STATS` to monitor the overhead memory of each DB, but there still lacks a total sum to show an overall trend. So this PR adds the total overhead of all DBs to `INFO MEMORY` section, together with the total count of rehashing DB dicts, providing some intuitive metrics about main dicts rehashing. This PR adds the following metrics to INFO MEMORY * `mem_overhead_db_hashtable_rehashing` - only size of ht[0] in dictionaries we're rehashing (i.e. the memory that's gonna get released soon) and a similar ones to MEMORY STATS: * `overhead.db.hashtable.lut` (complements the existing `overhead.hashtable.main` and `overhead.hashtable.expires` which also counts the `dictEntry` structs too) * `overhead.db.hashtable.rehashing` - temporary rehashing overhead. * `db.dict.rehashing.count` - number of top level dictionaries being rehashed. --------- Co-authored-by:
zhaozhao.zz <zhaozhao.zz@alibaba-inc.com> Co-authored-by:
Oran Agra <oran@redislabs.com>
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