Tom Lane 40d35036bb Avoid floating-point underflow while tracking buffer allocation rate. ... When the system is idle for awhile after activity, the "smoothed_alloc" state variable in BgBufferSync converges slowly to zero. With standard IEEE float arithmetic this results in several iterations with denormalized values, which causes kernel traps and annoying log messages on some poorly-designed platforms. There's no real need to track such small values of smoothed_alloc, so we can prevent the kernel traps by forcing it to zero as soon as it's too small to be interesting for our purposes. This issue is purely cosmetic, since the iterations don't happen fast enough for the kernel traps to pose any meaningful performance problem, but still it seems worth shutting up the log messages. The kernel log messages were previously reported by a number of people, but kudos to Greg Matthews for tracking down exactly where they were coming from.		2011-11-19 00:35:29 -05:00
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buffer	Avoid floating-point underflow while tracking buffer allocation rate.	2011-11-19 00:35:29 -05:00
file	Change debug message from ereport to elog	2011-07-19 07:50:10 +03:00
freespace	Remove unnecessary #include references, per pgrminclude script.	2011-09-01 10:04:27 -04:00
ipc	Derive oldestActiveXid at correct time for Hot Standby.	2011-11-02 08:54:56 +00:00
large_object	Remove unnecessary #include references, per pgrminclude script.	2011-09-01 10:04:27 -04:00
lmgr	Revert removal of trace_userlocks, because userlocks aren't gone.	2011-11-10 17:54:27 -05:00
page	Remove unnecessary #include references, per pgrminclude script.	2011-09-01 10:04:27 -04:00
smgr	Split work of bgwriter between 2 processes: bgwriter and checkpointer.	2011-11-01 17:14:47 +00:00
Makefile	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00