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Add writeback to pg_stat_io

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28e626bde0 added the concept of IOOps but neglected to include writeback
operations. ac8d53dae5 added time spent doing these I/O operations. Without
counting writeback, checkpointer write time in the log often differed
substantially from that in pg_stat_io. To fix this, add IOOp IOOP_WRITEBACK
and track writeback in pg_stat_io.

Bumps catversion.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reported-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20230419172326.dhgyo4wrrhulovt6%40awork3.anarazel.de
This commit is contained in:
Andres Freund
2023-05-17 11:18:35 -07:00
parent 52676dc2e0
commit 093e5c57d5
12 changed files with 82 additions and 25 deletions
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5
src/include/storage/buf_internals.h
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@@ -388,8 +388,9 @@ extern PGDLLIMPORT CkptSortItem *CkptBufferIds;
*/
/* bufmgr.c */
extern void WritebackContextInit(WritebackContext *context, int *max_pending);
extern void IssuePendingWritebacks(WritebackContext *wb_context);
extern void ScheduleBufferTagForWriteback(WritebackContext *wb_context, BufferTag *tag);
extern void IssuePendingWritebacks(WritebackContext *wb_context, IOContext io_context);
extern void ScheduleBufferTagForWriteback(WritebackContext *wb_context,
IOContext io_context, BufferTag *tag);
/* freelist.c */
extern IOContext IOContextForStrategy(BufferAccessStrategy strategy);