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Add some instrumentation to the bgwriter, through the stats collector.

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New view pg_stat_bgwriter, and the functions required to build it.
This commit is contained in:
Magnus Hagander
2007-03-30 18:34:56 +00:00
parent f9ce21f94c
commit 335feca441
10 changed files with 349 additions and 12 deletions
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18
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.215 2007/02/01 19:10:27 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.216 2007/03/30 18:34:55 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -80,6 +80,12 @@ static bool IsForInput;
/* local state for LockBufferForCleanup */
static volatile BufferDesc *PinCountWaitBuf = NULL;
/*
* Global statistics for the bgwriter. The contents of this variable
* only makes sense in the bgwriter process.
*/
extern PgStat_MsgBgWriter BgWriterStats;
static bool PinBuffer(volatile BufferDesc *buf);
static void PinBuffer_Locked(volatile BufferDesc *buf);
@ -964,6 +970,8 @@ BufferSync(void)
{
if (SyncOneBuffer(buf_id, false))
{
BgWriterStats.m_buf_written_checkpoints++;
/*
* If in bgwriter, absorb pending fsync requests after each
* WRITES_PER_ABSORB write operations, to prevent overflow of the
@ -1027,9 +1035,13 @@ BgBufferSync(void)
if (SyncOneBuffer(buf_id1, false))
{
if (++num_written >= bgwriter_all_maxpages)
{
BgWriterStats.m_maxwritten_all++;
break;
}
}
}
BgWriterStats.m_buf_written_all += num_written;
}
/*
@ -1048,11 +1060,15 @@ BgBufferSync(void)
if (SyncOneBuffer(buf_id2, true))
{
if (++num_written >= bgwriter_lru_maxpages)
{
BgWriterStats.m_maxwritten_lru++;
break;
}
}
if (++buf_id2 >= NBuffers)
buf_id2 = 0;
}
BgWriterStats.m_buf_written_lru += num_written;
}
}