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Convert the PGPROC->lwWaitLink list into a dlist instead of open coding it.

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Besides being shorter and much easier to read it changes the logic in
LWLockRelease() to release all shared lockers when waking up any. This
can yield some significant performance improvements - and the fairness
isn't really much worse than before, as we always allowed new shared
lockers to jump the queue.
This commit is contained in:
Andres Freund
2014-12-25 17:24:30 +01:00
parent 570bd2b3fd
commit 7882c3b0b9
5 changed files with 58 additions and 101 deletions
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2
src/backend/storage/lmgr/proc.c
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@@ -372,7 +372,6 @@ InitProcess(void)
MyPgXact->vacuumFlags |= PROC_IS_AUTOVACUUM;
MyProc->lwWaiting = false;
MyProc->lwWaitMode = 0;
MyProc->lwWaitLink = NULL;
MyProc->waitLock = NULL;
MyProc->waitProcLock = NULL;
#ifdef USE_ASSERT_CHECKING
@@ -535,7 +534,6 @@ InitAuxiliaryProcess(void)
MyPgXact->vacuumFlags = 0;
MyProc->lwWaiting = false;
MyProc->lwWaitMode = 0;
MyProc->lwWaitLink = NULL;
MyProc->waitLock = NULL;
MyProc->waitProcLock = NULL;
#ifdef USE_ASSERT_CHECKING