From 9427c808130255911dd3e4eee99b6f2c1cc42066 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sat, 5 Jan 2019 21:52:57 +0000
Subject: shrink low-bandwidth pipes under Linux

I've hit /proc/sys/fs/pipe-user-pages-* limits on some systems.
So stop hogging resources on pipes which don't benefit from
giant sizes.

Some of these can use eventfd in the future to further reduce
resource use.
---
 lib/PublicInbox/Daemon.pm | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/PublicInbox/Daemon.pm')

diff --git a/lib/PublicInbox/Daemon.pm b/lib/PublicInbox/Daemon.pm
index 4629aadb..6d2ae81b 100644
--- a/lib/PublicInbox/Daemon.pm
+++ b/lib/PublicInbox/Daemon.pm
@@ -356,6 +356,11 @@ sub unlink_pid_file_safe_ish ($$) {
 sub master_loop {
 	pipe(my ($p0, $p1)) or die "failed to create parent-pipe: $!";
 	pipe(my ($r, $w)) or die "failed to create self-pipe: $!";
+
+	if ($^O eq 'linux') { # 1031: F_SETPIPE_SZ = 1031
+		fcntl($_, 1031, 4096) for ($w, $p1);
+	}
+
 	IO::Handle::blocking($w, 0);
 	my $set_workers = $worker_processes;
 	my @caught;
-- 
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