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Use group updates when setting transaction status in clog.

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Commit 0e141c0fbb introduced a mechanism
to reduce contention on ProcArrayLock by having a single process clear
XIDs in the procArray on behalf of multiple processes, reducing the
need to hand the lock around.  A previous attempt to introduce a similar
mechanism for CLogControlLock in ccce90b398
crashed and burned, but the design problem which resulted in those
failures is believed to have been corrected in this version.

Amit Kapila, with some cosmetic changes by me.  See the previous commit
message for additional credits.

Discussion: http://postgr.es/m/CAA4eK1KudxzgWhuywY_X=yeSAhJMT4DwCjroV5Ay60xaeB2Eew@mail.gmail.com
This commit is contained in:
Robert Haas
2017-09-01 11:45:17 -04:00
parent 89c59b742a
commit baaf272ac9
6 changed files with 285 additions and 12 deletions
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src/include/pgstat.h
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@ -812,6 +812,7 @@ typedef enum
WAIT_EVENT_PARALLEL_FINISH,
WAIT_EVENT_PARALLEL_BITMAP_SCAN,
WAIT_EVENT_PROCARRAY_GROUP_UPDATE,
WAIT_EVENT_CLOG_GROUP_UPDATE,
WAIT_EVENT_REPLICATION_ORIGIN_DROP,
WAIT_EVENT_REPLICATION_SLOT_DROP,
WAIT_EVENT_SAFE_SNAPSHOT,