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Expose BufferUsageAccumDiff().

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Previously pg_stat_statements calculated the difference of buffer counters
by its own code even while BufferUsageAccumDiff() had the same code.
This commit expose BufferUsageAccumDiff() and makes pg_stat_statements
use it for the calculation, in order to simply the code.

This change also would be useful for the upcoming patch for the planning
counters in pg_stat_statements because the patch will add one more code
for the calculation of difference of buffer counters and that can easily be
done by using BufferUsageAccumDiff().

Author: Julien Rouhaud
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/bdfee4e0-a304-2498-8da5-3cb52c0a193e@oss.nttdata.com
This commit is contained in:
Fujii Masao
2020-03-30 12:15:26 +09:00
parent b61d161c14
commit 4a539a25eb
3 changed files with 5 additions and 27 deletions
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2
src/include/executor/instrument.h
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@@ -81,5 +81,7 @@ extern void InstrAggNode(Instrumentation *dst, Instrumentation *add);
extern void InstrStartParallelQuery(void);
extern void InstrEndParallelQuery(BufferUsage *result);
extern void InstrAccumParallelQuery(BufferUsage *result);
extern void BufferUsageAccumDiff(BufferUsage *dst,
const BufferUsage *add, const BufferUsage *sub);
#endif /* INSTRUMENT_H */