From 899741eefb59f4d368324a618cc7c79092373d51 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 3 Oct 2022 13:01:24 +0200
Subject: Add support for buildos.ram_total, buildos.cpu_affinity

---
 buildos | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/buildos b/buildos
index 9808719..6510977 100755
--- a/buildos
+++ b/buildos
@@ -229,13 +229,17 @@ fi
 # And to make it easier to provision memory it's really helpful to base it
 # on the physical value.
 #
-ram_total=0
-for i in $(sudo dmidecode -t 17 | sed -n -re 's/^\s*Size:\s*([0-9]+)\s*GB.*$/\1/p'); do
-  ram_total=$(($ram_total + $i * 1024 * 1024))
-done
+if [ -z "$ram_total" ]; then
+  ram_total=0
+  for i in $(sudo dmidecode -t 17 | sed -n -re 's/^\s*Size:\s*([0-9]+)\s*GB.*$/\1/p'); do
+    ram_total=$(($ram_total + $i * 1024 * 1024))
+  done
 
-if [ "$ram_total" -eq 0 ]; then
-  error "unable to determine physical memory size"
+  if [ "$ram_total" -eq 0 ]; then
+    error "unable to determine physical memory size, use buildos.ram_total to specify"
+  fi
+else
+  ram_total=$(($ram_total * 1024 * 1024))
 fi
 
 cpu_total="$(lscpu | sed -n -re 's/^CPU\(s\): *([0-9]+)$/\1/p')"
@@ -277,6 +281,9 @@ function print ()
   echo "cpu_reserved:   $cpu_reserved"
   echo "cpu_overcommit: $cpu_overcommit"
   echo "cpu_slice:      $cpu_slice"
+  if [ -n "$cpu_affinity" ]; then
+    echo "cpu_affinity:   $cpu_affinity"
+  fi
   echo
 
   echo "ram_total:      $ram_total KB"
@@ -921,6 +928,13 @@ function bbot_start () # <toolchain-name> <toolchain-index>
 	-e "s#^ExecStart=[^ ]+(.*)#ExecStart=$id/bin/bbot-agent\1#" \
 	"$id/lib/systemd/system/bbot-agent@.service"
 
+    # Patch in CPU affinity.
+    #
+    if [ -n "$cpu_affinity" ]; then
+      sed -i -r -e "s/^(CPUAffinity)=.*/\1=$cpu_affinity/" \
+	  "$id/lib/systemd/system/bbot-agent@.service"
+    fi
+
     # Patch in build/bootstrap/interactive timeouts.
     #
     if [ -n "$tbt" ]; then
-- 
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