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From c95026c6979bb6f8dc52a6392318bc16615ace77 Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Wed, 30 Jan 2019 10:36:53 +0100
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Subject: [PATCH] rules: implement new memory hotplug policy
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Our new policy is based on following motivations (assumptions),
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* we want to allow the system to use hotplugged memory
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* we want memory ballon inflation to work as expected in VMs (going for small
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to big in terms of memory footprint)
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* we want to allow memory hotplug and memory hot-unplug on high-end
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enterprise server (we assume that node0 will have sufficient memory
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resources and marking all memory as movable shouldn't be a problem)
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Policy:
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* nevert online memory on s390 (on both physical and z/VM)
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* mark memory as "online_movable" on physical machines
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* mark memory as "online" in VMs
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If you have the feeling that all this is very wrong and we shouldn't
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encode complex policies in udev rules you are absolutely right. However,
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for now, we don't have any better place where to put it. In ideal world
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we would have a user-space daemon that would be able to configure the
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system wrt. to currently present HW and user-defined policy.
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Resolves: #1670728
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---
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rules/40-redhat.rules | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/rules/40-redhat.rules b/rules/40-redhat.rules
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index 8ac96933c3..17b33682bd 100644
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--- a/rules/40-redhat.rules
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+++ b/rules/40-redhat.rules
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@@ -4,7 +4,15 @@
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SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1"
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# Memory hotadd request
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-SUBSYSTEM=="memory", ACTION=="add", PROGRAM=="/bin/uname -p", RESULT!="s390*", ATTR{state}=="offline", ATTR{state}="online"
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+SUBSYSTEM!="memory", GOTO="memory_hotplug_end"
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+ACTION!="add", GOTO="memory_hotplug_end"
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+PROGRAM="/bin/uname -p", RESULT=="s390*", GOTO="memory_hotplug_end"
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+
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+ENV{.state}="online"
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+PROGRAM="/bin/systemd-detect-virt", RESULT=="none", ENV{.state}="online_movable"
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+ATTR{state}=="offline", ATTR{state}="$env{.state}"
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+
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+LABEL="memory_hotplug_end"
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# reload sysctl.conf / sysctl.conf.d settings when the bridge module is loaded
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ACTION=="add", SUBSYSTEM=="module", KERNEL=="bridge", RUN+="/usr/lib/systemd/systemd-sysctl --prefix=/proc/sys/net/bridge"
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