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