postgres

Commit Graph

Author	SHA1	Message	Date
Heikki Linnakangas	dfda6ebaec	Don't waste the last segment of each 4GB logical log file. The comments claimed that wasting the last segment made it easier to do calculations with XLogRecPtrs, because you don't have problems representing last-byte-position-plus-1 that way. In my experience, however, it only made things more complicated, because the there was two ways to represent the boundary at the beginning of a logical log file: logid = n+1 and xrecoff = 0, or as xlogid = n and xrecoff = 4GB - XLOG_SEG_SIZE. Some functions were picky about which representation was used. Also, use a 64-bit segment number instead of the log/seg combination, to point to a certain WAL segment. We assume that all platforms have a working 64-bit integer type nowadays. This is an incompatible change in WAL format, so bumping WAL version number.	13 years ago
Bruce Momjian	927d61eeff	Run pgindent on 9.2 source tree in preparation for first 9.3 commit-fest.	13 years ago
Simon Riggs	055c352abb	After any checkpoint, close all smgr files handles in bgwriter	13 years ago
Simon Riggs	1ec6a2bbc9	Provide interim statistics while in mid-checkpoint. Re-implements similar functionality in 9.1 and previously which was removed during split of checkpointer and bgwriter. Requested/spotted by Magnus Hagander	13 years ago
Tom Lane	f40022f1ad	Make WaitLatch's WL_POSTMASTER_DEATH result trustworthy; simplify callers. Per a suggestion from Peter Geoghegan, make WaitLatch responsible for verifying that the WL_POSTMASTER_DEATH bit it returns is truthful (by testing PostmasterIsAlive). Then simplify its callers, who no longer need to do that for themselves. Remove weasel wording about falsely-set result bits from WaitLatch's API contract.	13 years ago
Tom Lane	fd71421b01	Improve tests for postmaster death in auxiliary processes. In checkpointer and walwriter, avoid calling PostmasterIsAlive unless WaitLatch has reported WL_POSTMASTER_DEATH. This saves a kernel call per iteration of the process's outer loop, which is not all that much, but a cycle shaved is a cycle earned. I had already removed the unconditional PostmasterIsAlive calls in bgwriter and pgstat in previous patches, but forgot that WL_POSTMASTER_DEATH is supposed to be treated as untrustworthy (per comment in unix_latch.c); so adjust those two cases to match. There are a few other places where the same idea might be applied, but only after substantial code rearrangement, so I didn't bother.	13 years ago
Tom Lane	d3ae406f54	Further tweaking of nomenclature in checkpointer.c. Get rid of some more naming choices that only make sense if you know that this code used to be in the bgwriter, as well as some stray comments referencing the bgwriter.	13 years ago
Simon Riggs	8f28789bff	Rename BgWriterShmem/Request to CheckpointerShmem/Request	13 years ago
Simon Riggs	bbd3ec9dce	Rename BgWriterCommLock to CheckpointerCommLock	13 years ago
Tom Lane	5461564a9d	Reduce idle power consumption of walwriter and checkpointer processes. This patch modifies the walwriter process so that, when it has not found anything useful to do for many consecutive wakeup cycles, it extends its sleep time to reduce the server's idle power consumption. It reverts to normal as soon as it's done any successful flushes. It's still true that during any async commit, backends check for completed, unflushed pages of WAL and signal the walwriter if there are any; so that in practice the walwriter can get awakened and returned to normal operation sooner than the sleep time might suggest. Also, improve the checkpointer so that it uses a latch and a computed delay time to not wake up at all except when it has something to do, replacing a previous hardcoded 0.5 sec wakeup cycle. This also is primarily useful for reducing the server's power consumption when idle. In passing, get rid of the dedicated latch for signaling the walwriter in favor of using its procLatch, since that comports better with possible generic signal handlers using that latch. Also, fix a pre-existing bug with failure to save/restore errno in walwriter's signal handlers. Peter Geoghegan, somewhat simplified by Tom	13 years ago
Robert Haas	5d4b60f2f2	Lots of doc corrections. Josh Kupershmidt	13 years ago
Simon Riggs	ba1868ba31	Minor bug fix and cleanup from self-review of sync rep queues patch.	14 years ago
Simon Riggs	73f617f13f	Various minor comments changes from bgwriter to checkpointer.	14 years ago
Simon Riggs	8366c7803e	Allow pg_basebackup from standby node with safety checking. Base backup follows recommended procedure, plus goes to great lengths to ensure that partial page writes are avoided. Jun Ishizuka and Fujii Masao, with minor modifications	14 years ago
Bruce Momjian	e126958c2e	Update copyright notices for year 2012.	14 years ago
Simon Riggs	3ba182056f	Have checkpointer send stats once each processing loop. Noted by Fujii Masao	14 years ago
Simon Riggs	bf405ba8e4	Add new file for checkpointer.c	14 years ago

17 Commits (061e7efb1b4c5b8a5d02122b7780531b8d5bf23d)