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pgstat: split reporting/fetching of bgwriter and checkpointer stats.

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These have been unrelated since bgwriter and checkpointer were split into two
processes in 806a2aee37. As there several pending patches (shared memory
stats, extending the set of tracked IO / buffer statistics) that are made a
bit more awkward by the grouping, split them. Done separately to make
reviewing easier.

This does *not* change the contents of pg_stat_bgwriter or move fields out of
bgwriter/checkpointer stats that arguably do not belong in either. However
pgstat_fetch_global() was renamed and split into
pgstat_fetch_stat_checkpointer() and pgstat_fetch_stat_bgwriter().

Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20210405092914.mmxqe7j56lsjfsej@alap3.anarazel.de
This commit is contained in:
Andres Freund
2021-08-04 19:16:04 -07:00
parent cc8033e1da
commit 1bc8e7b099
6 changed files with 185 additions and 67 deletions
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8
src/backend/storage/buffer/bufmgr.c
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@ -2137,7 +2137,7 @@ BufferSync(int flags)
if (SyncOneBuffer(buf_id, false, &wb_context) & BUF_WRITTEN)
{
TRACE_POSTGRESQL_BUFFER_SYNC_WRITTEN(buf_id);
BgWriterStats.m_buf_written_checkpoints++;
PendingCheckpointerStats.m_buf_written_checkpoints++;
num_written++;
}
}
@ -2247,7 +2247,7 @@ BgBufferSync(WritebackContext *wb_context)
strategy_buf_id = StrategySyncStart(&strategy_passes, &recent_alloc);
/* Report buffer alloc counts to pgstat */
BgWriterStats.m_buf_alloc += recent_alloc;
PendingBgWriterStats.m_buf_alloc += recent_alloc;
/*
* If we're not running the LRU scan, just stop after doing the stats
@ -2437,7 +2437,7 @@ BgBufferSync(WritebackContext *wb_context)
reusable_buffers++;
if (++num_written >= bgwriter_lru_maxpages)
{
BgWriterStats.m_maxwritten_clean++;
PendingBgWriterStats.m_maxwritten_clean++;
break;
}
}
@ -2445,7 +2445,7 @@ BgBufferSync(WritebackContext *wb_context)
reusable_buffers++;
}
BgWriterStats.m_buf_written_clean += num_written;
PendingBgWriterStats.m_buf_written_clean += num_written;
#ifdef BGW_DEBUG
elog(DEBUG1, "bgwriter: recent_alloc=%u smoothed=%.2f delta=%ld ahead=%d density=%.2f reusable_est=%d upcoming_est=%d scanned=%d wrote=%d reusable=%d",