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

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

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 375644059db558163761f506df107ffc8b17f0fb..5b3551c084729c838d5d9b8e7bd9cd321bf3343a 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1277,11 +1277,12 @@ default:\
     
      
       
-      On Linux
-      /proc/sys/fs/file-max determines the
-      maximum number of open files that the kernel will support.  It can
-      be changed by writing a different number into the file or by
-      adding an assignment in /etc/sysctl.conf.
+      On Linux the kernel parameter
+      fs.file-max determines the maximum number of open
+      files that the kernel will support.  It can be changed with
+      sysctl -w fs.file-max=N.
+      To make the setting persist across reboots, add an assignment
+      in /etc/sysctl.conf.
       The maximum limit of files per process is fixed at the time the
       kernel is compiled; see
       /usr/src/linux/Documentation/proc.txt for

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index ad35340a52d67e7535bb6d4e3cc5fe7bfc62eb36..db091b927864fb6b12ed72ad71c850a62385cf3e 100644 (file)
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -4944,7 +4944,7 @@ SubPostmasterMain(int argc, char *argv[])
     * If testing EXEC_BACKEND on Linux, you should run this as root before
     * 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
     * child process's memory map to be different from the parent's, making it