database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-05 07:21:24 +03:00
Code Activity

Buffer manager modifications to keep a local buffer-dirtied bit as well

Browse Source 
as a shared dirtybit for each shared buffer.  The shared dirtybit still
controls writing the buffer, but the local bit controls whether we need
to fsync the buffer's file.  This arrangement fixes a bug that allowed
some required fsyncs to be missed, and should improve performance as well.
For more info see my post of same date on pghackers.
This commit is contained in:
Tom Lane
2000-04-09 04:43:20 +00:00
parent 9c38a8d296
commit 1f6d8b90b8
13 changed files with 955 additions and 435 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/backend/storage/buffer/buf_init.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.32 2000/01/26 05:56:50 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.33 2000/04/09 04:43:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -65,9 +65,11 @@ long *NWaitIOBackendP;
extern IpcSemaphoreId WaitIOSemId;
long *PrivateRefCount; /* also used in freelist.c */
bits8 *BufferLocks; /* */
long *CommitInfoNeedsSave;/* to write buffers where we have filled
* in t_infomask */
bits8 *BufferLocks; /* flag bits showing locks I have set */
BufferTag *BufferTagLastDirtied; /* tag buffer had when last dirtied by me */
BufferBlindId *BufferBlindLastDirtied; /* and its BlindId too */
bool *BufferDirtiedByMe; /* T if buf has been dirtied in cur xact */
/*
* Data Structures:
@ -247,7 +249,9 @@ InitBufferPool(IPCKey key)
#endif
PrivateRefCount = (long *) calloc(NBuffers, sizeof(long));
BufferLocks = (bits8 *) calloc(NBuffers, sizeof(bits8));
CommitInfoNeedsSave = (long *) calloc(NBuffers, sizeof(long));
BufferTagLastDirtied = (BufferTag *) calloc(NBuffers, sizeof(BufferTag));
BufferBlindLastDirtied = (BufferBlindId *) calloc(NBuffers, sizeof(BufferBlindId));
BufferDirtiedByMe = (bool *) calloc(NBuffers, sizeof(bool));
}
/* -----------------------------------------------------