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Add a few more DTrace probes to the backend.

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Robert Lor
This commit is contained in:
Alvaro Herrera
2008-08-01 13:16:09 +00:00
parent 26e6991a2d
commit e36e6b1cab
16 changed files with 231 additions and 41 deletions
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45
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.234 2008/07/13 20:45:47 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.235 2008/08/01 13:16:08 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@ -34,6 +34,8 @@
#include <unistd.h>
#include "miscadmin.h"
#include "pg_trace.h"
#include "pgstat.h"
#include "postmaster/bgwriter.h"
#include "storage/buf_internals.h"
#include "storage/bufmgr.h"
@ -42,7 +44,6 @@
#include "storage/smgr.h"
#include "utils/rel.h"
#include "utils/resowner.h"
#include "pgstat.h"
/* Note: these two macros only work on shared buffers, not local ones! */
@ -213,12 +214,22 @@ ReadBuffer_common(SMgrRelation smgr, bool isLocalBuf, BlockNumber blockNum,
if (isExtend)
blockNum = smgrnblocks(smgr);
TRACE_POSTGRESQL_BUFFER_READ_START(blockNum, smgr->smgr_rnode.spcNode,
smgr->smgr_rnode.dbNode, smgr->smgr_rnode.relNode, isLocalBuf);
if (isLocalBuf)
{
ReadLocalBufferCount++;
bufHdr = LocalBufferAlloc(smgr, blockNum, &found);
if (found)
{
LocalBufferHitCount++;
TRACE_POSTGRESQL_BUFFER_HIT(true); /* true == local buffer */
}
else
{
TRACE_POSTGRESQL_BUFFER_MISS(true); /* ditto */
}
}
else
{
@ -230,7 +241,14 @@ ReadBuffer_common(SMgrRelation smgr, bool isLocalBuf, BlockNumber blockNum,
*/
bufHdr = BufferAlloc(smgr, blockNum, strategy, &found);
if (found)
{
BufferHitCount++;
TRACE_POSTGRESQL_BUFFER_HIT(false); /* false != local buffer */
}
else
{
TRACE_POSTGRESQL_BUFFER_MISS(false); /* ditto */
}
}
/* At this point we do NOT hold any locks. */
@ -246,6 +264,11 @@ ReadBuffer_common(SMgrRelation smgr, bool isLocalBuf, BlockNumber blockNum,
if (VacuumCostActive)
VacuumCostBalance += VacuumCostPageHit;
TRACE_POSTGRESQL_BUFFER_READ_DONE(blockNum,
smgr->smgr_rnode.spcNode,
smgr->smgr_rnode.dbNode,
smgr->smgr_rnode.relNode, isLocalBuf, found);
return BufferDescriptorGetBuffer(bufHdr);
}
@ -368,6 +391,10 @@ ReadBuffer_common(SMgrRelation smgr, bool isLocalBuf, BlockNumber blockNum,
if (VacuumCostActive)
VacuumCostBalance += VacuumCostPageMiss;
TRACE_POSTGRESQL_BUFFER_READ_DONE(blockNum, smgr->smgr_rnode.spcNode,
smgr->smgr_rnode.dbNode, smgr->smgr_rnode.relNode,
isLocalBuf, found);
return BufferDescriptorGetBuffer(bufHdr);
}
@ -1086,6 +1113,8 @@ BufferSync(int flags)
if (num_to_write == 0)
return; /* nothing to do */
TRACE_POSTGRESQL_BUFFER_SYNC_START(NBuffers, num_to_write);
/*
* Loop over all buffers again, and write the ones (still) marked with
* BM_CHECKPOINT_NEEDED. In this loop, we start at the clock sweep point
@ -1117,6 +1146,7 @@ BufferSync(int flags)
{
if (SyncOneBuffer(buf_id, false) & BUF_WRITTEN)
{
TRACE_POSTGRESQL_BUFFER_SYNC_WRITTEN(buf_id);
BgWriterStats.m_buf_written_checkpoints++;
num_written++;
@ -1147,6 +1177,8 @@ BufferSync(int flags)
buf_id = 0;
}
TRACE_POSTGRESQL_BUFFER_SYNC_DONE(NBuffers, num_written, num_to_write);
/*
* Update checkpoint statistics. As noted above, this doesn't include
* buffers written by other backends or bgwriter scan.
@ -1653,11 +1685,13 @@ PrintBufferLeakWarning(Buffer buffer)
void
CheckPointBuffers(int flags)
{
TRACE_POSTGRESQL_BUFFER_CHECKPOINT_START(flags);
CheckpointStats.ckpt_write_t = GetCurrentTimestamp();
BufferSync(flags);
CheckpointStats.ckpt_sync_t = GetCurrentTimestamp();
smgrsync();
CheckpointStats.ckpt_sync_end_t = GetCurrentTimestamp();
TRACE_POSTGRESQL_BUFFER_CHECKPOINT_DONE();
}
@ -1759,6 +1793,10 @@ FlushBuffer(volatile BufferDesc *buf, SMgrRelation reln)
if (reln == NULL)
reln = smgropen(buf->tag.rnode);
TRACE_POSTGRESQL_BUFFER_FLUSH_START(reln->smgr_rnode.spcNode,
reln->smgr_rnode.dbNode,
reln->smgr_rnode.relNode);
/*
* Force XLOG flush up to buffer's LSN. This implements the basic WAL
* rule that log updates must hit disk before any of the data-file changes
@ -1785,6 +1823,9 @@ FlushBuffer(volatile BufferDesc *buf, SMgrRelation reln)
BufferFlushCount++;
TRACE_POSTGRESQL_BUFFER_FLUSH_DONE(reln->smgr_rnode.spcNode,
reln->smgr_rnode.dbNode, reln->smgr_rnode.relNode);
/*
* Mark the buffer as clean (unless BM_JUST_DIRTIED has become set) and
* end the io_in_progress state.