At Thu, 25 Mar 2021 23:45:17 +0900, torikoshia <torikos...@oss.nttdata.com> 
wrote in 
> Attached new one.

Thanks!

-    SELECT * FROM pg_get_backend_memory_contexts();
+    SELECT * FROM pg_get_backend_memory_contexts(0, 0);

However we can freely change the signature since it's new in 14, but I
see the (void) signature as useful.  I vaguely thought of defining
pg_get_backend_memory_contexts(void) in pg_proc.dat then defining
(int, int) as a different function in system_views.sql.  That allows
the function of the second signature to output nothing. You can make a
distinction between the two signatures by using PG_NARGS() in the C
function.

That being said, it's somewhat uneasy that two functions with the same
name returns different values.  I'd like to hear others what they feel
like about the behavior.


+# print memory context of specified backend
+

This looks like a garbage.


+       if( pid == 0)

Odd spacing:p

+note "current_logfiles = $current_logfiles";
+
+like(
+       $current_logfiles,
+       qr|^stderr log/postgresql-.*log$|,
+       'current_logfiles is sane');
+
+my $lfname = $current_logfiles;
+$lfname =~ s/^stderr //;
+chomp $lfname;
+
+my $logfile;
+my $print_count;
+
+# Verify that the backtraces of the processes are logged into logfile.
+for (my $attempts = 0; $attempts < $max_attempts; $attempts++)
+{
+       $logfile = $node->data_dir . '/' . $lfname;

It seems that you forgot to include the change on this part in v4.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center


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