Skip checkpoints, archiving on idle systems.

Some background activity (like checkpoints, archive timeout, standby
snapshots) is not supposed to happen on an idle system. Unfortunately
so far it was not easy to determine when a system is idle, which
defeated some of the attempts to avoid redundant activity on an idle
system.

To make that easier, allow to make individual WAL insertions as not
being "important". By checking whether any important activity happened
since the last time an activity was performed, it now is easy to check
whether some action needs to be repeated.

Use the new facility for checkpoints, archive timeout and standby
snapshots.

The lack of a facility causes some issues in older releases, but in my
opinion the consequences (superflous checkpoints / archived segments)
aren't grave enough to warrant backpatching.

Author: Michael Paquier, editorialized by Andres Freund
Reviewed-By: Andres Freund, David Steele, Amit Kapila, Kyotaro HORIGUCHI
Bug: #13685
Discussion:
    https://www.postgresql.org/message-id/20151016203031.3019.72930@wrigleys.postgresql.org
    https://www.postgresql.org/message-id/CAB7nPqQcPqxEM3S735Bd2RzApNqSNJVietAC=6kfkYv_45dKwA@mail.gmail.com
Backpatch: -

1 files changed, 2 insertions, 2 deletions

diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h
index ceb0462098a..05f996b1277 100644
--- a/src/include/access/xlog_internal.h
+++ b/src/include/access/xlog_internal.h
@@ -283,8 +283,8 @@ extern const RmgrData RmgrTable[];
 /*
  * Exported to support xlog switching from checkpointer
  */
-extern pg_time_t GetLastSegSwitchTime(void);
-extern XLogRecPtr RequestXLogSwitch(void);
+extern pg_time_t GetLastSegSwitchData(XLogRecPtr *lastSwitchLSN);
+extern XLogRecPtr RequestXLogSwitch(bool mark_uninmportant);
 
 extern void GetOldestRestartPoint(XLogRecPtr *oldrecptr, TimeLineID *oldtli);