Re: LogwrtResult contended spinlock

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org, Jaime Casanova <jaime(dot)casanova(at)2ndquadrant(dot)com>
Subject: Re: LogwrtResult contended spinlock
Date: 2021-11-22 21:56:43
Message-ID: 202111222156.xmo2yji5ifi2@alvherre.pgsql
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There was an earlier comment by Andres that asyncXactLSN should also be
atomic, to avoid an ugly spinlock interaction with the new atomic-based
logwrtResult. The 0002 here is an attempt at doing that; I found that
it also needed to change WalWriterSleeping to use atomics, to avoid
XLogSetAsyncXactLSN having to grab the spinlock for that.

Álvaro Herrera Valdivia, Chile —
"Learn about compilers. Then everything looks like either a compiler or
a database, and now you have two problems but one of them is fun."

Attachment Content-Type Size
v5-0001-make-LogwrtResult-atomic.patch text/x-diff 21.0 KB
v5-0002-more-atomics.patch text/x-diff 4.0 KB

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