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help / color / mirror / Atom feedFrom: Ashutosh Bapat <[email protected]>
To: Tomas Vondra <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Dmitry Dolgov <[email protected]>
Subject: Re: Adding basic NUMA awareness
Date: Thu, 3 Jul 2025 19:37:18 +0530
Message-ID: <CAExHW5tj3rb5ox0jVQEWqAExu0cqAubj60BW2R_04mmbuG9XpA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
<CAExHW5te2bTcYHLu2zLPjfwQU3gWhE9T7w++BFhTbUiqAVaY4A@mail.gmail.com>
<[email protected]>
On Wed, Jul 2, 2025 at 6:06 PM Tomas Vondra <[email protected]> wrote:
>
> I'm not sure how you're rebuilding the freelist. Presumably it can
> contain buffers that are no longer valid (after shrinking). How is that
> handled to not break anything? I think the NUMA variant would do exactly
> the same thing, except that there's multiple lists.
Before shrinking the buffers, we walk the free list removing any
buffers that are going to be removed. When expanding, by linking the
new buffers in the order and then adding those to the already existing
free list. 0005 patch in [1] has the code for the same.
[1] https://www.postgresql.org/message-id/my4hukmejato53ef465ev7lk3sqiqvneh7436rz64wmtc7rbfj%40hmuxsf2ng...
--
Best Wishes,
Ashutosh Bapat
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Subject: Re: Adding basic NUMA awareness
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