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help / color / mirror / Atom feedFrom: Pavel Borisov <[email protected]>
To: Maxim Orlov <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Cc: wenhui qiu <[email protected]>
Cc: Heikki Linnakangas <[email protected]>
Cc: Postgres hackers <[email protected]>
Subject: Re: POC: make mxidoff 64 bits
Date: Thu, 12 Sep 2024 16:09:08 +0400
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Hi, Maxim!
Previously we accessed offsets in shared MultiXactState without locks as
32-bit read is always atomic. But I'm not sure it's so when offset become
64-bit.
E.g. GetNewMultiXactId():
nextOffset = MultiXactState->nextOffset;
is outside lock.
There might be other places we do the same as well.
Regards,
Pavel Borisov
Supabase
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Subject: Re: POC: make mxidoff 64 bits
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