Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pkWyV-0000NB-Mq for pgsql-hackers@arkaria.postgresql.org; Thu, 06 Apr 2023 21:16:55 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1pkWyU-0004wZ-Il for pgsql-hackers@arkaria.postgresql.org; Thu, 06 Apr 2023 21:16:54 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pkWyU-0004oO-37 for pgsql-hackers@lists.postgresql.org; Thu, 06 Apr 2023 21:16:54 +0000 Received: from mail-io1-xd2f.google.com ([2607:f8b0:4864:20::d2f]) by makus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1pkWyQ-0004v7-CE for pgsql-hackers@postgresql.org; Thu, 06 Apr 2023 21:16:52 +0000 Received: by mail-io1-xd2f.google.com with SMTP id k13so9115369iov.10 for ; Thu, 06 Apr 2023 14:16:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=telsasoft-com.20210112.gappssmtp.com; s=20210112; t=1680815810; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=c/XIYo2zU+jvFzrruHkVEH0yVtDOcXpbxcF/eKmvlfw=; b=tQgTpv8TOLsS69o/n2QgQgMeigwSOw2yCKZdgXvhEb+E9TdXvR8F51wry1GBcIRC68 oGYUaREoC0KGPG2EKWQBJ04YYgP3emFkikHOLhQ6cb+YvYpUigRvqkeYCVPNdwyhGeVd L1M4Ebw1YvBSZar9Bn748v/OGHNTABmI2PgtWook4GgBA6G0LNAk/y3OSok3N/hYwuCa 3AQqL1lpzZhFoYUH3XDuo9UeAVyJBfruGcrvom6Lp7GJmRm+qza1K3dki4x5HJVJvYJG jmkTkX8kkORVEVai5r5wib+x9+z70TMu+4gKalY3cdl3r6ntNv7BUTvdgBG4aHQ6PrBO /MMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680815810; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=c/XIYo2zU+jvFzrruHkVEH0yVtDOcXpbxcF/eKmvlfw=; b=l1QPMYIQaRYBWOecwH8Kzx2J0ub7pIdRXQJR1Io+BKD7RgL7qi1ZFPMzHX8KS4wKdj iMx48MJ52jGuq1ig/PLabx37ApfXjGeUqV2zPT3eSRBFCHmndZnCe3Lhht2B31MOnGez vdYp+cfjSu1UEcoQR6BC0WBBhXYlS7iSESOMBwP0WRhmlCLzwL7mycZ7kpTeeh0Niy6h fxK8M79ibnecXHiU0r2PdBx7tXLw71I0RpkPDnzi+vWNN6hxhG91ItDgl7mS980a97pG lzHsCq8bQ4Cqz4p0/IuDThzRC5I0M8pYmxJVzco4YAoH87ejK93332yalGKe200DTOMv yuNQ== X-Gm-Message-State: AAQBX9e7damT4M6PTTLPCTtSNxUzcfefy7QvcbKPOA1GyVXT0yhxEdUj GJddDte3QVz21zsDU3fUi4SBJw== X-Google-Smtp-Source: AKy350ZbBS2Z8he5UbqSHc0DvoxdouskyYV/BktHveumQ7bADWPhIjGxpQOzlA537iJe28GhV/xhIQ== X-Received: by 2002:a5e:db08:0:b0:758:dba1:471c with SMTP id q8-20020a5edb08000000b00758dba1471cmr596463iop.16.1680815809805; Thu, 06 Apr 2023 14:16:49 -0700 (PDT) Received: from pryzbyj.telsasoft (charmander.telsasoft.com. [50.244.222.1]) by smtp.gmail.com with ESMTPSA id s191-20020a0251c8000000b004046f72271esm641587jaa.100.2023.04.06.14.16.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Apr 2023 14:16:49 -0700 (PDT) Received: by pryzbyj.telsasoft (Postfix, from userid 1000) id A537A8081B3; Thu, 6 Apr 2023 16:16:47 -0500 (CDT) Date: Thu, 6 Apr 2023 16:16:47 -0500 From: Justin Pryzby To: David Rowley Cc: Melanie Plageman , Andres Freund , Masahiko Sawada , Bharath Rupireddy , Tom Lane , Peter Geoghegan , pgsql-hackers@postgresql.org, Robert Haas Subject: Re: Option to not use ringbuffer in VACUUM, using it in failsafe mode Message-ID: References: <20230405170553.webeqbzhmnawgnvg@awork3.anarazel.de> <20230405211534.4skgskbilnxqrmxg@awork3.anarazel.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk +VACUUM uses a ring like sequential scans, however, the size this ring +controlled by the vacuum_buffer_usage_limit GUC. Dirty pages are not removed should say: ".. the size OF this ring IS .." ?