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Split work of bgwriter between 2 processes: bgwriter and checkpointer.

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bgwriter is now a much less important process, responsible for page
cleaning duties only. checkpointer is now responsible for checkpoints
and so has a key role in shutdown. Later patches will correct doc
references to the now old idea that bgwriter performs checkpoints.
Has beneficial effect on performance at high write rates, but mainly
refactoring to more easily allow changes for power reduction by
simplifying previously tortuous code around required to allow page
cleaning and checkpointing to time slice in the same process.

Patch by me, Review by Dickson Guedes
This commit is contained in:
Simon Riggs
2011-11-01 17:14:47 +00:00
parent 589adb86ee
commit 806a2aee37
11 changed files with 124 additions and 987 deletions
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2
src/include/storage/procsignal.h
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@@ -19,7 +19,7 @@
/*
* Reasons for signalling a Postgres child process (a backend or an auxiliary
* process, like bgwriter). We can cope with concurrent signals for different
* process, like checkpointer). We can cope with concurrent signals for different
* reasons. However, if the same reason is signaled multiple times in quick
* succession, the process is likely to observe only one notification of it.
* This is okay for the present uses.