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Commit5444f06

Alexander Korotkov

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Lockfree Pin/UnpinBuffer ported from 9.6.

1 parentc71dbee commit5444f06Copy full SHA for 5444f06

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12 files changed

+712

-434

lines changed

contrib/pg_buffercache
- pg_buffercache_pages.c
src
- backend/storage
  - buffer
  - lmgr
    - s_lock.c
- include
  - c.h
  - postmaster
    - postmaster.h
  - storage
    - buf_internals.h
    - s_lock.h
  - utils
    - elog.h
- tools/pgindent
  - typedefs.list

12 files changed

+712

-434

lines changed

`‎contrib/pg_buffercache/pg_buffercache_pages.c`

Lines changed: 8 additions & 7 deletions

Original file line number	Diff line number	Diff line change
`@@ -148,33 +148,34 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)`
`148`	`148`	`*/`
`149`	`149`	`for (i=0;i<NBuffers;i++)`
`150`	`150`	`{`
`151`		`-volatileBufferDesc*bufHdr;`
	`151`	`+BufferDesc*bufHdr;`
	`152`	`+uint32buf_state;`
`152`	`153`
`153`	`154`	`bufHdr=GetBufferDescriptor(i);`
`154`	`155`	`/* Lock each buffer header before inspecting. */`
`155`		`-LockBufHdr(bufHdr);`
	`156`	`+buf_state=LockBufHdr(bufHdr);`
`156`	`157`
`157`	`158`	`fctx->record[i].bufferid=BufferDescriptorGetBuffer(bufHdr);`
`158`	`159`	`fctx->record[i].relfilenode=bufHdr->tag.rnode.relNode;`
`159`	`160`	`fctx->record[i].reltablespace=bufHdr->tag.rnode.spcNode;`
`160`	`161`	`fctx->record[i].reldatabase=bufHdr->tag.rnode.dbNode;`
`161`	`162`	`fctx->record[i].forknum=bufHdr->tag.forkNum;`
`162`	`163`	`fctx->record[i].blocknum=bufHdr->tag.blockNum;`
`163`		`-fctx->record[i].usagecount=bufHdr->usage_count;`
`164`		`-fctx->record[i].pinning_backends=bufHdr->refcount;`
	`164`	`+fctx->record[i].usagecount=BUF_STATE_GET_USAGECOUNT(buf_state);`
	`165`	`+fctx->record[i].pinning_backends=BUF_STATE_GET_REFCOUNT(buf_state);`
`165`	`166`
`166`		`-if (bufHdr->flags&BM_DIRTY)`
	`167`	`+if (buf_state&BM_DIRTY)`
`167`	`168`	`fctx->record[i].isdirty= true;`
`168`	`169`	`else`
`169`	`170`	`fctx->record[i].isdirty= false;`
`170`	`171`
`171`	`172`	`/* Note if the buffer is valid, and has storage created */`
`172`		`-if ((bufHdr->flags&BM_VALID)&& (bufHdr->flags&BM_TAG_VALID))`
	`173`	`+if ((buf_state&BM_VALID)&& (buf_state&BM_TAG_VALID))`
`173`	`174`	`fctx->record[i].isvalid= true;`
`174`	`175`	`else`
`175`	`176`	`fctx->record[i].isvalid= false;`
`176`	`177`
`177`		`-UnlockBufHdr(bufHdr);`
	`178`	`+UnlockBufHdr(bufHdr,buf_state);`
`178`	`179`	`}`
`179`	`180`
`180`	`181`	`/*`

`‎src/backend/storage/buffer/buf_init.c`

Lines changed: 2 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -96,12 +96,9 @@ InitBufferPool(void)`
`96`	`96`	`BufferDesc*buf=GetBufferDescriptor(i);`
`97`	`97`
`98`	`98`	`CLEAR_BUFFERTAG(buf->tag);`
`99`		`-buf->flags=0;`
`100`		`-buf->usage_count=0;`
`101`		`-buf->refcount=0;`
`102`		`-buf->wait_backend_pid=0;`
`103`	`99`
`104`		`-SpinLockInit(&buf->buf_hdr_lock);`
	`100`	`+pg_atomic_init_u32(&buf->state,0);`
	`101`	`+buf->wait_backend_pid=0;`
`105`	`102`
`106`	`103`	`buf->buf_id=i;`
`107`	`104`

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Commit5444f06

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12 files changed

12 files changed

`‎contrib/pg_buffercache/pg_buffercache_pages.c`

`‎src/backend/storage/buffer/buf_init.c`

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