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help / color / mirror / Atom feedFrom: Peter Eisentraut <[email protected]>
To: Bertrand Drouvot <[email protected]>
To: Heikki Linnakangas <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: PGPROC alignment (was Re: pgsql: Separate RecoveryConflictReasons from procsignals)
Date: Mon, 23 Feb 2026 17:13:29 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <aY7auF2/[email protected]>
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<aY7auF2/[email protected]>
On 13.02.26 09:03, Bertrand Drouvot wrote:
> +/*
> + * If compiler understands aligned pragma, use it to align the struct at cache
> + * line boundaries. This is just for performance, to (a) avoid false sharing
> + * and (b) to make the multiplication / division to convert between PGPROC *
> + * and ProcNumber be a little cheaper.
> + */
> +#if defined(pg_attribute_aligned)
> + pg_attribute_aligned(PG_CACHE_LINE_SIZE)
> +#endif
> +PGPROC;
You can/should use C11 standard alignas(), so you don't need to worry
about whether it's supported or not.
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Subject: Re: PGPROC alignment (was Re: pgsql: Separate RecoveryConflictReasons from procsignals)
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