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bufmgr: Remove buffer-write-dirty tracepoints

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The trace point was using the relfileno / fork / block for the to-be-read-in
buffer. Some upcoming work would make that more expensive to provide. We still
have buffer-flush-start/done, which can serve most tracing needs that
buffer-write-dirty could serve.

Discussion: https://postgr.es/m/f5164e7a-eef6-8972-75a3-8ac622ed0c6e@iki.fi
This commit is contained in:
Andres Freund 2023-04-03 18:02:41 -07:00
parent 05a304a855
commit 8a2b1b1477
3 changed files with 0 additions and 29 deletions
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17
doc/src/sgml/monitoring.sgml
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@ -7817,23 +7817,6 @@ FROM pg_stat_get_backend_idset() AS backendid;
it's typically not actually been written to disk yet.)
The arguments are the same as for <literal>buffer-flush-start</literal>.</entry>
</row>
<row>
<entry><literal>buffer-write-dirty-start</literal></entry>
<entry><literal>(ForkNumber, BlockNumber, Oid, Oid, Oid)</literal></entry>
<entry>Probe that fires when a server process begins to write a dirty
buffer. (If this happens often, it implies that
<xref linkend="guc-shared-buffers"/> is too
small or the background writer control parameters need adjustment.)
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>
</row>
<row>
<entry><literal>buffer-write-dirty-done</literal></entry>
<entry><literal>(ForkNumber, BlockNumber, Oid, Oid, Oid)</literal></entry>
<entry>Probe that fires when a dirty-buffer write is complete.
The arguments are the same as for <literal>buffer-write-dirty-start</literal>.</entry>
</row>
<row>
<entry><literal>wal-buffer-write-dirty-start</literal></entry>
<entry><literal>()</literal></entry>

10
src/backend/storage/buffer/bufmgr.c
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@ -1280,21 +1280,11 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
}
/* OK, do the I/O */
TRACE_POSTGRESQL_BUFFER_WRITE_DIRTY_START(forkNum, blockNum,
smgr->smgr_rlocator.locator.spcOid,
smgr->smgr_rlocator.locator.dbOid,
smgr->smgr_rlocator.locator.relNumber);
FlushBuffer(buf, NULL, IOOBJECT_RELATION, io_context);
LWLockRelease(BufferDescriptorGetContentLock(buf));
ScheduleBufferTagForWriteback(&BackendWritebackContext,
&buf->tag);
TRACE_POSTGRESQL_BUFFER_WRITE_DIRTY_DONE(forkNum, blockNum,
smgr->smgr_rlocator.locator.spcOid,
smgr->smgr_rlocator.locator.dbOid,
smgr->smgr_rlocator.locator.relNumber);
}
else
{

2
src/backend/utils/probes.d
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@ -66,8 +66,6 @@ provider postgresql {
probe buffer__sync__start(int, int);
probe buffer__sync__written(int);
probe buffer__sync__done(int, int, int);
probe buffer__write__dirty__start(ForkNumber, BlockNumber, Oid, Oid, Oid);
probe buffer__write__dirty__done(ForkNumber, BlockNumber, Oid, Oid, Oid);
probe deadlock__found();