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 1k0GHP-00022R-8L for pgsql-hackers@arkaria.postgresql.org; Tue, 28 Jul 2020 03:27:51 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1k0GHO-0008U9-4p for pgsql-hackers@arkaria.postgresql.org; Tue, 28 Jul 2020 03:27:50 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k0GHN-0008SA-To for pgsql-hackers@lists.postgresql.org; Tue, 28 Jul 2020 03:27:49 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by magus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k0GHK-0004FJ-V8 for pgsql-hackers@postgresql.org; Tue, 28 Jul 2020 03:27:49 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.15.2/8.15.2) with ESMTP id 06S3ReOr1152782; Mon, 27 Jul 2020 23:27:40 -0400 From: Tom Lane To: Thomas Munro cc: Andres Freund , Andrew Dunstan , Mark Wong , Justin Pryzby , pgsql-hackers Subject: Re: stress test for parallel workers In-reply-to: References: <20032.1570808731@sss.pgh.pa.us> <14878.1570820201@sss.pgh.pa.us> <18266.1570824826@sss.pgh.pa.us> <21051.1570828384@sss.pgh.pa.us> <17884.1570915552@sss.pgh.pa.us> <25033.1570925192@sss.pgh.pa.us> <20191013133154.fyxrkcbf4zpwrmtt@alap3.anarazel.de> <32038.1570976985@sss.pgh.pa.us> <20191013145053.z5w4gyew5dcgft7g@alap3.anarazel.de> <942.1570978653@sss.pgh.pa.us> <4113.1570982833@sss.pgh.pa.us> <27924.1571068231@sss.pgh.pa.us> Comments: In-reply-to Thomas Munro message dated "Tue, 28 Jul 2020 13:35:45 +1200" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1152780.1595906860.1@sss.pgh.pa.us> Content-Transfer-Encoding: quoted-printable Date: Mon, 27 Jul 2020 23:27:40 -0400 Message-ID: <1152781.1595906860@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk Thomas Munro writes: > Hehe, the dodgy looking magic numbers *were* wrong: > - * The kernel signal delivery code writes up to about 1.5kB > + * The kernel signal delivery code writes a bit over 4KB > https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20200724092528.1= 578671-2-mpe@ellerman.id.au/ ... and, having seemingly not learned a thing, they just replaced them with new magic numbers. Mumble sizeof() mumble. Anyway, I guess the interesting question for us is how long it will take for this fix to propagate into real-world systems. I don't have much of a clue about the Linux kernel workflow, anybody want to venture a guess? regards, tom lane