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DAOS-16469 dtx: optimize DTX CoS cache - b26
If there are a lot of committable DTX entries in DTX CoS cache, then it may be inefficient to locate the DTX entry in CoS cache with given oid + dkey_hash, that may happen under the case of that DTX batched commit is blocked (such as because of network trouble) as to trigger DTX refresh (for DTX cleanup) on other related engines. If that happened, it will increase the system load on such engine and slow down DTX commit further more. The patch reduces unnecessary search operation inside CoS cache. Add metrics (io/dtx/async_cmt_lat/tgt_id) for DTX asynchronously commit latency (with unit ms). Signed-off-by: Fan Yong <[email protected]>
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