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Refactor the fsync queue for wider use.

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Previously, md.c and checkpointer.c were tightly integrated so that
fsync calls could be handed off and processed in the background.
Introduce a system of callbacks and file tags, so that other modules
can hand off fsync work in the same way.

For now only md.c uses the new interface, but other users are being
proposed.  Since there may be use cases that are not strictly SMGR
implementations, use a new function table for sync handlers rather
than extending the traditional SMGR one.

Instead of using a bitmapset of segment numbers for each RelFileNode
in the checkpointer's hash table, make the segment number part of the
key.  This requires sending explicit "forget" requests for every
segment individually when relations are dropped, but suits the file
layout schemes of proposed future users better (ie sparse or high
segment numbers).

Author: Shawn Debnath and Thomas Munro
Reviewed-by: Thomas Munro, Andres Freund
Discussion: https://postgr.es/m/CAEepm=2gTANm=e3ARnJT=n0h8hf88wqmaZxk0JYkxw+b21fNrw@mail.gmail.com
This commit is contained in:
Thomas Munro
2019-04-04 21:56:03 +13:00
parent 33215d113d
commit 3eb77eba5a
18 changed files with 904 additions and 890 deletions
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7
src/backend/access/transam/xlog.c
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@ -66,6 +66,7 @@
#include "storage/reinit.h"
#include "storage/smgr.h"
#include "storage/spin.h"
#include "storage/sync.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/memutils.h"
@ -6981,7 +6982,7 @@ StartupXLOG(void)
if (ArchiveRecoveryRequested && IsUnderPostmaster)
{
PublishStartupProcessInformation();
SetForwardFsyncRequests();
EnableSyncRequestForwarding();
SendPostmasterSignal(PMSIGNAL_RECOVERY_STARTED);
bgwriterLaunched = true;
}
@ -8566,7 +8567,7 @@ CreateCheckPoint(int flags)
* the REDO pointer. Note that smgr must not do anything that'd have to
* be undone if we decide no checkpoint is needed.
*/
smgrpreckpt();
SyncPreCheckpoint();
/* Begin filling in the checkpoint WAL record */
MemSet(&checkPoint, 0, sizeof(checkPoint));
@ -8856,7 +8857,7 @@ CreateCheckPoint(int flags)
/*
* Let smgr do post-checkpoint cleanup (eg, deleting old files).
*/
smgrpostckpt();
SyncPostCheckpoint();
/*
* Update the average distance between checkpoints if the prior checkpoint