Andres Freund db76b1efbb Allow SetHintBits() to succeed if the buffer's LSN is new enough. ... Previously we only allowed SetHintBits() to succeed if the commit LSN of the last transaction touching the page has already been flushed to disk. We can't generally change the LSN of the page, because we don't necessarily have the required locks on the page. But the required LSN interlock does not mean the commit record has to be flushed immediately, it just requires that the commit record will be flushed before the page is written out. Therefore if the buffer LSN is newer than the commit LSN, the hint bit can be safely set. In a number of scenarios (e.g. pgbench) this noticeably increases the number of hint bits are set. But more importantly it also keeps the success rate up when flushing WAL less frequently. That was the original reason for commit 4de82f7d7, which has negative performance consequences in a number of scenarios. This will allow a followup commit to reduce the flush rate. Discussion: 20160118163908.GW10941@awork2.anarazel.de		2016-02-15 22:48:51 +01:00
..
backend	Allow SetHintBits() to succeed if the buffer's LSN is new enough.	2016-02-15 22:48:51 +01:00
bin	pg_upgrade: Add C comment about NextXID delimiter	2016-02-12 17:53:36 -05:00
common	Fix typos in comments	2016-02-01 11:43:48 +01:00
include	Correct Copyright year from 2015 to 2016	2016-02-15 13:19:35 -08:00
interfaces	Make sure ecpg header files do not have a comment lasting several lines, one of	2016-02-01 13:21:00 +01:00
makefiles	Fix typos in comments and doc	2016-01-28 16:47:36 +09:00
pl	Remove no-longer-needed old-style check for incompatible plpythons.	2016-01-11 20:13:31 -05:00
port	Fix order of arguments to va_start()	2016-01-07 20:32:49 -03:00
template	Remove some remains from Alpha support removal	2015-10-29 16:40:14 -04:00
test	Increase deadlock_timeout some more in the deadlock-hard isolation test.	2016-02-12 17:22:42 -05:00
timezone	Update time zone data files to tzdata release 2016a.	2016-02-05 10:59:09 -05:00
tools	Change the way that LWLocks for extensions are allocated.	2016-02-04 16:43:04 -05:00
tutorial	Update copyright for 2016	2016-01-02 13:33:40 -05:00
.gitignore
bcc32.mak	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
DEVELOPERS	Replace a couple of references to files that no longer exist in the source	2009-05-04 08:08:47 +00:00
Makefile	Create libpgcommon, and move pg_malloc et al to it	2013-02-12 11:21:05 -03:00
Makefile.global.in	Add support for systemd service notifications	2016-02-02 21:04:29 -05:00
Makefile.shlib	AIX: Link TRANSFORM modules with their dependencies.	2015-07-15 21:00:26 -04:00
nls-global.mk	Setup error context callback for transaction lock waits	2014-03-19 15:10:36 -03:00
win32.mak	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00