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Background writer process

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This first part of the background writer does no syncing at all.
It's only purpose is to keep the LRU heads clean so that regular
backends seldom to never have to call write().

Jan
This commit is contained in:
Jan Wieck
2003-11-19 15:55:08 +00:00
parent 5032f83082
commit cfeca62148
12 changed files with 271 additions and 42 deletions
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24
src/backend/storage/buffer/freelist.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/freelist.c,v 1.35 2003/11/16 16:41:00 wieck Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/freelist.c,v 1.36 2003/11/19 15:55:07 wieck Exp $
*
*-------------------------------------------------------------------------
*/
@@ -190,8 +190,28 @@ StrategyBufferLookup(BufferTag *tagPtr, bool recheck)
if (StrategyControl->stat_report + DebugSharedBuffers < now)
{
long all_hit, b1_hit, t1_hit, t2_hit, b2_hit;
int id, t1_clean, t2_clean;
ErrorContextCallback *errcxtold;
id = StrategyControl->listHead[STRAT_LIST_T1];
t1_clean = 0;
while (id >= 0)
{
if (BufferDescriptors[StrategyCDB[id].buf_id].flags & BM_DIRTY)
break;
t1_clean++;
id = StrategyCDB[id].next;
}
id = StrategyControl->listHead[STRAT_LIST_T2];
t2_clean = 0;
while (id >= 0)
{
if (BufferDescriptors[StrategyCDB[id].buf_id].flags & BM_DIRTY)
break;
t2_clean++;
id = StrategyCDB[id].next;
}
if (StrategyControl->num_lookup == 0)
{
all_hit = b1_hit = t1_hit = t2_hit = b2_hit = 0;
@@ -215,6 +235,8 @@ StrategyBufferLookup(BufferTag *tagPtr, bool recheck)
T1_TARGET, B1_LENGTH, T1_LENGTH, T2_LENGTH, B2_LENGTH);
elog(DEBUG1, "ARC total =%4ld%% B1hit=%4ld%% T1hit=%4ld%% T2hit=%4ld%% B2hit=%4ld%%",
all_hit, b1_hit, t1_hit, t2_hit, b2_hit);
elog(DEBUG1, "ARC clean buffers at LRU T1= %5d T2= %5d",
t1_clean, t2_clean);
error_context_stack = errcxtold;
StrategyControl->num_lookup = 0;