database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-25 12:03:53 +03:00
Code Activity

Track shared buffer hits in pg_stat_io

Browse Source 
Among other things, this should make it easier to calculate a useful cache hit
ratio by excluding buffer reads via buffer access strategies. As buffer access
strategies reuse buffers (and thus evict the prior buffer contents), it is
normal to see reads on repeated scans of the same data.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CAAKRu_beMa9Hzih40%3DXPYqhDVz6tsgUGTrhZXRo%3Dunp%2Bszb%3DUA%40mail.gmail.com
This commit is contained in:
Andres Freund
2023-03-30 19:22:40 -07:00
parent 6c3b697b19
commit 8aaa04b32d
12 changed files with 109 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/include/storage/buf_internals.h
View File

@@ -419,7 +419,7 @@ extern PrefetchBufferResult PrefetchLocalBuffer(SMgrRelation smgr,
ForkNumber forkNum,
BlockNumber blockNum);
extern BufferDesc *LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum,
BlockNumber blockNum, bool *foundPtr, IOContext *io_context);
BlockNumber blockNum, bool *foundPtr);
extern void MarkLocalBufferDirty(Buffer buffer);
extern void DropRelationLocalBuffers(RelFileLocator rlocator,
ForkNumber forkNum,