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Further dtrace adjustments for the backend-IDs-in-relpath patch. 

Update the documentation, and back out a few ill-considered changes
whose folly I failed to realize for failure to read the documentation.
This commit is contained in:
Robert Haas 2010-08-14 02:22:10 +00:00
parent 105d4c5ffe
commit 27f145a40e
3 changed files with 29 additions and 21 deletions
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36
doc/src/sgml/monitoring.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.82 2010/08/08 16:27:03 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.83 2010/08/14 02:22:10 rhaas Exp $ -->
<chapter id="monitoring">
<title>Monitoring Database Activity</title>
@ -1436,26 +1436,28 @@ SELECT pg_stat_get_backend_pid(s.backendid) AS procpid,
</row>
<row>
<entry>buffer-read-start</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, bool, bool)</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int, bool)</entry>
<entry>Probe that fires when a buffer read is started.
arg0 and arg1 contain the fork and block numbers of the page (but
arg1 will be -1 if this is a relation extension request).
arg2, arg3, and arg4 contain the tablespace, database, and relation OIDs
identifying the relation.
arg5 is true for a local buffer, false for a shared buffer.
arg5 is the ID of the backend which created the temporary relation for a
local buffer, or InvalidBackendId (-1) for a shared buffer.
arg6 is true for a relation extension request, false for normal
read.</entry>
</row>
<row>
<entry>buffer-read-done</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, bool, bool, bool)</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int, bool, bool)</entry>
<entry>Probe that fires when a buffer read is complete.
arg0 and arg1 contain the fork and block numbers of the page (if this
is a relation extension request, arg1 now contains the block number
of the newly added block).
arg2, arg3, and arg4 contain the tablespace, database, and relation OIDs
identifying the relation.
arg5 is true for a local buffer, false for a shared buffer.
arg5 is the ID of the backend which created the temporary relation for a
local buffer, or InvalidBackendId (-1) for a shared buffer.
arg6 is true for a relation extension request, false for normal
read.
arg7 is true if the buffer was found in the pool, false if not.</entry>
@ -1521,38 +1523,46 @@ SELECT pg_stat_get_backend_pid(s.backendid) AS procpid,
</row>
<row>
<entry>smgr-md-read-start</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid)</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int)</entry>
<entry>Probe that fires when beginning to read a block from a relation.
arg0 and arg1 contain the fork and block numbers of the page.
arg2, arg3, and arg4 contain the tablespace, database, and relation OIDs
identifying the relation.</entry>
identifying the relation.
arg5 is the ID of the backend which created the temporary relation for a
local buffer, or InvalidBackendId (-1) for a shared buffer.</entry>
</row>
<row>
<entry>smgr-md-read-done</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int, int)</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int, int, int)</entry>
<entry>Probe that fires when a block read is complete.
arg0 and arg1 contain the fork and block numbers of the page.
arg2, arg3, and arg4 contain the tablespace, database, and relation OIDs
identifying the relation.
arg5 is the number of bytes actually read, while arg6 is the number
arg5 is the ID of the backend which created the temporary relation for a
local buffer, or InvalidBackendId (-1) for a shared buffer.
arg6 is the number of bytes actually read, while arg7 is the number
requested (if these are different it indicates trouble).</entry>
</row>
<row>
<entry>smgr-md-write-start</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid)</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int)</entry>
<entry>Probe that fires when beginning to write a block to a relation.
arg0 and arg1 contain the fork and block numbers of the page.
arg2, arg3, and arg4 contain the tablespace, database, and relation OIDs
identifying the relation.</entry>
identifying the relation.
arg5 is the ID of the backend which created the temporary relation for a
local buffer, or InvalidBackendId (-1) for a shared buffer.</entry>
</row>
<row>
<entry>smgr-md-write-done</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int, int)</entry>
<entry>(ForkNumber, BlockNumber, Oid, Oid, Oid, int, int, int)</entry>
<entry>Probe that fires when a block write is complete.
arg0 and arg1 contain the fork and block numbers of the page.
arg2, arg3, and arg4 contain the tablespace, database, and relation OIDs
identifying the relation.
arg5 is the number of bytes actually written, while arg6 is the number
arg5 is the ID of the backend which created the temporary relation for a
local buffer, or InvalidBackendId (-1) for a shared buffer.
arg6 is the number of bytes actually written, while arg7 is the number
requested (if these are different it indicates trouble).</entry>
</row>
<row>

8
src/backend/storage/buffer/bufmgr.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.258 2010/08/13 22:54:17 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.259 2010/08/14 02:22:10 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -1852,8 +1852,7 @@ FlushBuffer(volatile BufferDesc *buf, SMgrRelation reln)
buf->tag.blockNum,
reln->smgr_rnode.node.spcNode,
reln->smgr_rnode.node.dbNode,
reln->smgr_rnode.node.relNode,
reln->smgr_rnode.backend);
reln->smgr_rnode.node.relNode);
/*
* Force XLOG flush up to buffer's LSN. This implements the basic WAL
@ -1892,8 +1891,7 @@ FlushBuffer(volatile BufferDesc *buf, SMgrRelation reln)
buf->tag.blockNum,
reln->smgr_rnode.node.spcNode,
reln->smgr_rnode.node.dbNode,
reln->smgr_rnode.node.relNode,
reln->smgr_rnode.backend);
reln->smgr_rnode.node.relNode);
/* Pop the error context stack */
error_context_stack = errcontext.previous;

6
src/backend/utils/probes.d
View File

@ -3,7 +3,7 @@
*
* Copyright (c) 2006-2010, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/utils/probes.d,v 1.14 2010/08/13 22:54:17 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/utils/probes.d,v 1.15 2010/08/14 02:22:10 rhaas Exp $
* ----------
*/
@ -56,8 +56,8 @@ provider postgresql {
probe buffer__read__start(ForkNumber, BlockNumber, Oid, Oid, Oid, int, bool);
probe buffer__read__done(ForkNumber, BlockNumber, Oid, Oid, Oid, int, bool, bool);
probe buffer__flush__start(ForkNumber, BlockNumber, Oid, Oid, Oid, int);
probe buffer__flush__done(ForkNumber, BlockNumber, Oid, Oid, Oid, int);
probe buffer__flush__start(ForkNumber, BlockNumber, Oid, Oid, Oid);
probe buffer__flush__done(ForkNumber, BlockNumber, Oid, Oid, Oid);
probe buffer__checkpoint__start(int);
probe buffer__checkpoint__sync__start();