| From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
|---|---|
| To: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
| Cc: | Jeff Davis <pgsql(at)j-davis(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec> |
| Subject: | Re: LogwrtResult contended spinlock |
| Date: | 2024-04-03 12:00:09 |
| Message-ID: | 202404031200.335odntqgtq4@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2024-Apr-03, Alvaro Herrera wrote:
> So what I do in the attached 0001 is stop using the XLogwrtResult struct
> in XLogCtl and replace it with separate Write and Flush values, and add
> the macro XLogUpdateLocalLogwrtResult() that copies the values of Write
> and Flush from the shared XLogCtl to the local variable given as macro
> argument. (I also added our idiomatic do {} while(0) to the macro
> definition, for safety). The new members are XLogCtl->logWriteResult
> and XLogCtl->logFlushResult and as of 0001 are just XLogRecPtr, so
> essentially identical semantics as the previous code. No atomic access
> yet!
BTW I forgot. I didn't like the name XLogUpdateLocalLogwrtResult() name
much. What do you think about RefreshXLogWriteResult() instead?
--
Álvaro Herrera 48°01'N 7°57'E — https://www.EnterpriseDB.com/
"How strange it is to find the words "Perl" and "saner" in such close
proximity, with no apparent sense of irony. I doubt that Larry himself
could have managed it." (ncm, http://lwn.net/Articles/174769/)
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