| From: | Thomas Munro <thomas(dot)munro(at)gmail(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>, "tanghy(dot)fnst(at)cn(dot)fujitsu(dot)com" <tanghy(dot)fnst(at)cn(dot)fujitsu(dot)com>, "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, "jankirk(dot)jamison(at)gmail(dot)com" <jankirk(dot)jamison(at)gmail(dot)com> |
| Subject: | Re: [Patch] Optimize dropping of relation buffers using dlist |
| Date: | 2021-03-11 23:27:45 |
| Message-ID: | CA+hUKG+oPoFizjABt=GXZWTEHx3oev5rAe2scjW2r6F1rguo5w@mail.gmail.com |
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| Lists: | pgsql-hackers |
While rebasing CF #2933 (which drops the _cached stuff and makes this
optimisation always available, woo), I happened to notice that we're
summing the size of many relations and forks into a variable
nBlocksToInvalidate of type BlockNumber. That could overflow.
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