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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Cc: Mark Wong <mark@2ndquadrant.com>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: stress test for parallel workers
Date: Mon, 27 Jul 2020 23:27:40 -0400
Message-ID: <1152781.1595906860@sss.pgh.pa.us> (raw)
In-Reply-To: <CA+hUKG+GJGNH7FP99asatmyf_mbM+nn-M6HHEio5nZwwEOrFVA@mail.gmail.com>
References: <20032.1570808731@sss.pgh.pa.us>
	<14878.1570820201@sss.pgh.pa.us>
	<CA+hUKGKNgufn12Uh4iEh5y=JkEnUBWnLLmi8L4zwzMunFeKwSA@mail.gmail.com>
	<18266.1570824826@sss.pgh.pa.us>
	<21051.1570828384@sss.pgh.pa.us>
	<17884.1570915552@sss.pgh.pa.us>
	<25033.1570925192@sss.pgh.pa.us>
	<CA+hUKGLZh8_Js04nd1-z4_awZyTT-2nzHPxuztn1ApuTS_r=Ow@mail.gmail.com>
	<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>
	<CA+hUKG+WZddYR4U9y2W78Ge4tsr7MXrgAFtBeUvb91vBcDqMRQ@mail.gmail.com>
	<CA+hUKG+GJGNH7FP99asatmyf_mbM+nn-M6HHEio5nZwwEOrFVA@mail.gmail.com>

Thomas Munro <thomas.munro@gmail.com> 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/20200724092528.1578671-2-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





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