| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | "k(dot)jamison(at)fujitsu(dot)com" <k(dot)jamison(at)fujitsu(dot)com> |
| Cc: | 'Amit Kapila' <amit(dot)kapila16(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)anarazel(dot)de>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: [Patch] Optimize dropping of relation buffers using dlist |
| Date: | 2020-09-28 08:07:40 |
| Message-ID: | TYAPR01MB29906F13FE844267A8B279E7FE350@TYAPR01MB2990.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
From: Jamison, Kirk/ジャミソン カーク <k(dot)jamison(at)fujitsu(dot)com>
> Is my understanding above correct?
No. I simply meant DropRelFileNodeBuffers() calls the following function, and avoids the optimization if it returns InvalidBlockNumber.
BlockNumber
smgrcachednblocks(SMgrRelation reln, ForkNumber forknum)
{
return reln->smgr_cached_nblocks[forknum];
}
Regards
Takayuki Tsunakawa
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