From: Tomáš Mózes <hydrapolic@gmail.com>
Date: Fri, 6 Mar 2020 06:40:30 +0000 (+0100)
Subject: app-emulation/xen: warn about credit2 scheduler instability
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=4e1a0667c9be4b76c4eef62be717be4ba288a147;p=gentoo.git

app-emulation/xen: warn about credit2 scheduler instability

Bug: https://bugs.gentoo.org/710140
Closes: https://github.com/gentoo/gentoo/pull/14842
Package-Manager: Portage-2.3.89, Repoman-2.3.20
Signed-off-by: Tomáš Mózes <hydrapolic@gmail.com>
Signed-off-by: Yixun Lan <dlan@gentoo.org>
---

diff --git a/app-emulation/xen/xen-4.12.2.ebuild b/app-emulation/xen/xen-4.12.2.ebuild
index ec19a8729db3..078c4ede6785 100644
--- a/app-emulation/xen/xen-4.12.2.ebuild
+++ b/app-emulation/xen/xen-4.12.2.ebuild
@@ -153,4 +153,13 @@ pkg_postinst() {
 	elog "You can optionally block the installation of /boot/xen-syms by an entry"
 	elog "in folder /etc/portage/env using the portage's feature INSTALL_MASK"
 	elog "e.g. echo ${msg} > /etc/portage/env/xen.conf"
+
+	ewarn
+	ewarn "Xen 4.12+ changed the default scheduler to credit2 which can cause"
+	ewarn "domU lockups on multi-cpu systems. The legacy credit scheduler seems"
+	ewarn "to work fine."
+	ewarn
+	ewarn "Add sched=credit to xen command line options to use the legacy scheduler."
+	ewarn
+	ewarn "https://wiki.gentoo.org/wiki/Xen#Xen_domU_hanging_with_Xen_4.12.2B"
 }
diff --git a/app-emulation/xen/xen-4.13.0-r1.ebuild b/app-emulation/xen/xen-4.13.0-r1.ebuild
index 2c03982f6608..7da3187cee25 100644
--- a/app-emulation/xen/xen-4.13.0-r1.ebuild
+++ b/app-emulation/xen/xen-4.13.0-r1.ebuild
@@ -153,4 +153,13 @@ pkg_postinst() {
 	elog "You can optionally block the installation of /boot/xen-syms by an entry"
 	elog "in folder /etc/portage/env using the portage's feature INSTALL_MASK"
 	elog "e.g. echo ${msg} > /etc/portage/env/xen.conf"
+
+	ewarn
+	ewarn "Xen 4.12+ changed the default scheduler to credit2 which can cause"
+	ewarn "domU lockups on multi-cpu systems. The legacy credit scheduler seems"
+	ewarn "to work fine."
+	ewarn
+	ewarn "Add sched=credit to xen command line options to use the legacy scheduler."
+	ewarn
+	ewarn "https://wiki.gentoo.org/wiki/Xen#Xen_domU_hanging_with_Xen_4.12.2B"
 }