Make /tmp large again

0001-Bump-tmp-size-back-to-50-of-RAM.patch

@@ -0,0 +1,38 @@
+From 4b09123e9b0554ed67937ca00a5c4cfd3f9c43ef Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
+Date: Fri, 24 Jul 2020 22:05:21 +0200
+Subject: [PATCH] Bump /tmp size back to 50% of RAM
+
+This should be enough to fix https://bugzilla.redhat.com/show_bug.cgi?id=1856514.
+But the limit should be significantly higher than 10% anyway. By setting a
+limit on /tmp at 10% we'll break many reasonable use cases, even though the
+machine would deal fine with a much larger fraction devoted to /tmp.
+(In the first version of this patch I made it 25% with the comment that
+"Even 25% might be too low.". The kernel default is 50%, and we have been using
+that seemingly without trouble since https://fedoraproject.org/wiki/Features/tmp-on-tmpfs.
+So let's just make it 50% again.)
+
+See 7d85383edbab73274dc81cc888d884bb01070bc2.
+
+(Another consideration is that we learned from from the whole initiative with
+zram in Fedora that a reasonable size for zram is 0.5-1.5 of RAM, and that pretty
+much all systems benefit from having zram or zswap enabled. Thus it is reasonable
+to assume that it'll become widely used. Taking the usual compression effectiveness
+of 0.2 into account, machines have effective memory available of between
+1.0 - 0.2*0.5 + 0.5 = 1.4 (for zram sized to 0.5 of RAM) and
+1.0 - 0.2*1.5 + 1.5 = 2.2 (for zram 1.5 sized to 1.5 of RAM) times RAM size.
+This means that the 10% was really like 7-4% of effective memory.)
+---
+ units/tmp.mount | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/units/tmp.mount b/units/tmp.mount
+index 7066e52261..cf6837852f 100644
+--- a/units/tmp.mount
++++ b/units/tmp.mount
+@@ -22,4 +22,4 @@ After=swap.target
+ What=tmpfs
+ Where=/tmp
+ Type=tmpfs
+-Options=mode=1777,strictatime,nosuid,nodev,size=10%,nr_inodes=400k
++Options=mode=1777,strictatime,nosuid,nodev,size=50%,nr_inodes=400k

systemd.spec

@@ -20,7 +20,7 @@
 Name:           systemd
 Url:            https://www.freedesktop.org/wiki/Software/systemd
 Version:        246~rc2
-Release:        1%{?dist}
+Release:        2%{?dist}
 # For a breakdown of the licensing, see README
 License:        LGPLv2+ and MIT and GPLv2+
 Summary:        System and Service Manager
@@ -70,6 +70,8 @@ GIT_DIR=../../src/systemd/.git git diffab -M v233..master@{2017-06-15} -- hwdb/[
 # https://bugzilla.redhat.com/show_bug.cgi?id=1738828
 Patch0001:      use-bfq-scheduler.patch
 
+Patch0002:      0001-Bump-tmp-size-back-to-50-of-RAM.patch
+
 %ifarch %{ix86} x86_64 aarch64
 %global have_gnu_efi 1
 %endif
@@ -772,6 +774,9 @@ fi
 %files tests -f .file-list-tests
 
 %changelog
+* Sun Jul 26 2020 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 246~rc2-2
+- Make /tmp be 50% of RAM again (#1856514)
+
 * Fri Jul 24 2020 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 246~rc2-1
 - New pre-release with incremental fixes
   (#1856037, #1858845, #1856122, #1857783)