Received: from malur.postgresql.org ([2a02:16a8:dc51::56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1gCIEX-0002Dp-Uu for pgsql-hackers@arkaria.postgresql.org; Tue, 16 Oct 2018 05:49:34 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1gCIEW-0003qK-5n for pgsql-hackers@arkaria.postgresql.org; Tue, 16 Oct 2018 05:49:32 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1gCIEV-0003pz-RP for pgsql-hackers@lists.postgresql.org; Tue, 16 Oct 2018 05:49:32 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1gCIET-0004gJ-5Y for pgsql-hackers@postgresql.org; Tue, 16 Oct 2018 05:49:30 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.4/8.14.4) with ESMTP id w9G5nMBF006511; Tue, 16 Oct 2018 01:49:23 -0400 From: Tom Lane To: Andres Freund cc: pgsql-hackers@postgresql.org, Thomas Munro Subject: Re: Large writable variables In-reply-to: <20181016045051.wr35ubb6h7h3ee2b@alap3.anarazel.de> References: <20181015200754.7y7zfuzsoux2c4ya@alap3.anarazel.de> <20181016045051.wr35ubb6h7h3ee2b@alap3.anarazel.de> Comments: In-reply-to Andres Freund message dated "Mon, 15 Oct 2018 21:50:51 -0700" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <6509.1539668962.1@sss.pgh.pa.us> Date: Tue, 16 Oct 2018 01:49:22 -0400 Message-ID: <6510.1539668962@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk Andres Freund writes: > [ let's rearrange the GUC structs ] I find it hard to believe that the API breaks you'll cause for extensions are a good trade for a few kB reduction in the size of the .data segment. regards, tom lane