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Commitb998fed

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Improve comment on top of pgstat_count_io_op_time()
This commit adds more documentation to pgstat_count_io_op_time() inpgstat_io.c, explaining its internals for pgstat_count_buffer_*(),pgBufferUsage and the contexts where these are used.Extracted from a larger patch by the same author.Author: Nazir Bilal YavuzDiscussion:https://postgr.es/m/CAN55FZ3AiQ+ZMxUuXnBpd0Rrh1YhwJ5FudkHg=JU0P+-W8T4Vg@mail.gmail.com
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‎src/backend/utils/activity/pgstat_io.c

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@@ -107,6 +107,14 @@ pgstat_prepare_io_time(bool track_io_guc)
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/*
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* Like pgstat_count_io_op() except it also accumulates time.
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*
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* The calls related to pgstat_count_buffer_*() are for pgstat_database. As
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* pg_stat_database only counts block read and write times, these are done for
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* IOOP_READ, IOOP_WRITE and IOOP_EXTEND.
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*
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* pgBufferUsage is used for EXPLAIN. pgBufferUsage has write and read stats
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* for shared, local and temporary blocks. pg_stat_io does not track the
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* activity of temporary blocks, so these are ignored here.
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*/
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void
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pgstat_count_io_op_time(IOObjectio_object,IOContextio_context,IOOpio_op,

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