The GucContext of log_autovacuum is PGC_BACKEND in the CVS HEAD,
but should it be PGC_SIGHUP? We cannot modify the variable on-the-fly
because the parameter is used only by autovacuum worker processes.
The similar variables, like autovacuum_vacuum_scale_factor, are
defined as PGC_SIGHUP.

Index: src/backend/utils/misc/guc.c
--- src/backend/utils/misc/guc.c        (head)
+++ src/backend/utils/misc/guc.c        (working copy)
@@ -1552,7 +1552,7 @@
-               {"log_autovacuum", PGC_BACKEND, LOGGING_WHAT,
+               {"log_autovacuum", PGC_SIGHUP, LOGGING_WHAT,
                        gettext_noop("Sets the minimum execution time above 
which autovacuum actions "
                                                 "will be logged."),
                        gettext_noop("Zero prints all actions.  The default is 
-1 (turning this feature off)."),

ITAGAKI Takahiro
NTT Open Source Software Center

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