From 386c4d38702b2643c09d8db7d7851a39f8798406 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Thu, 12 Jul 2018 00:41:28 -0400
Subject: Add NUMA support and vCPU pinning

---
 systemd/system/qemu | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'systemd/system/qemu')

diff --git a/systemd/system/qemu b/systemd/system/qemu
index 475ec10..324154b 100755
--- a/systemd/system/qemu
+++ b/systemd/system/qemu
@@ -2,6 +2,8 @@
 shopt -s lastpipe
 set -euE -o pipefail
 
+declare -A vcpu2cpulist
+numactl=()
 source "/etc/conf.d/qemu.d/$1"
 args+=(
 	-name "$1",debug-threads=on
@@ -11,7 +13,25 @@ args+=(
 	-serial  file:"/dev/stdout"
 	-daemonize
 )
+
 {
-	qemu-system-"${system}" "${args[@]}"
+	numactl "${numactl[@]}" -- qemu-system-"${system}" "${args[@]}"
+
+	if [[ ${#vcpu2cpulist[@]} -gt 0 ]]; then
+		declare -A vcpu2tid
+		while read -r line; do
+			if [[ $line != ?' CPU #'*:*thread_id=* ]]; then
+				continue
+			fi
+			vcpu=${line#?' CPU #'}; vcpu=${vcpu%%:*}
+			tid=${line#thread_id=}; tid=${tid%% *}
+			vcpu2tid[$vcpu]=$tid
+		done < <(socat STDIO UNIX-CONNECT:"/run/qemu-$1/monitor.sock" <<<'info cpus')
+
+		for vcpu in "${!vcpu_pins[@]}"; do
+			taskset --cpu-list --pid -- "${vcpu2cpulist[@]}" "${vcpu2tid[$vcpu]}"
+		done
+	fi
+
 	systemd-notify --ready
 } | exec cat
-- 
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