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Doc: prefer sysctl to /proc/sys in docs and comments.

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sysctl is more portable than Linux's /proc/sys file tree, and
often easier to use too.  That's why most of our docs refer to
sysctl when talking about how to adjust kernel parameters.
Bring the few stragglers into line.

Discussion: https://postgr.es/m/361175.1661187463@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2022-08-23 09:41:37 -04:00
parent 6d05d575be
commit eb0097c6f3
2 changed files with 7 additions and 6 deletions
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11
doc/src/sgml/runtime.sgml
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@ -1277,11 +1277,12 @@ default:\
<itemizedlist> <itemizedlist>
<listitem> <listitem>
<para> <para>
On <productname>Linux</productname> On <productname>Linux</productname> the kernel parameter
<filename>/proc/sys/fs/file-max</filename> determines the <varname>fs.file-max</varname> determines the maximum number of open
maximum number of open files that the kernel will support. It can files that the kernel will support. It can be changed with
be changed by writing a different number into the file or by <literal>sysctl -w fs.file-max=<replaceable>N</replaceable></literal>.
adding an assignment in <filename>/etc/sysctl.conf</filename>. To make the setting persist across reboots, add an assignment
in <filename>/etc/sysctl.conf</filename>.
The maximum limit of files per process is fixed at the time the The maximum limit of files per process is fixed at the time the
kernel is compiled; see kernel is compiled; see
<filename>/usr/src/linux/Documentation/proc.txt</filename> for <filename>/usr/src/linux/Documentation/proc.txt</filename> for

2
src/backend/postmaster/postmaster.c
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@ -4944,7 +4944,7 @@ SubPostmasterMain(int argc, char *argv[])
* If testing EXEC_BACKEND on Linux, you should run this as root before * If testing EXEC_BACKEND on Linux, you should run this as root before
* starting the postmaster: * starting the postmaster:
* *
* echo 0 >/proc/sys/kernel/randomize_va_space * sysctl -w kernel.randomize_va_space=0
* *
* This prevents using randomized stack and code addresses that cause the * This prevents using randomized stack and code addresses that cause the
* child process's memory map to be different from the parent's, making it * child process's memory map to be different from the parent's, making it