3 files changed, 85 insertions, 0 deletions
diff --git a/pcr/zramswap/PKGBUILD b/pcr/zramswap/PKGBUILD
new file mode 100644
index 000000000..db38ab084
--- /dev/null
+++ b/pcr/zramswap/PKGBUILD
@@ -0,0 +1,24 @@
+# Contributor (Arch): ifaigios <ifaigios_at_gmail_dot_com>
+# Contributor (Arch): Alyssa Hung <deciare@isisiew.org>
+# Contributor (Arch): Matt Brennan
+# Contributor (Arch): falconindy
+# Contributor (Arch): adee
+# Contributor (Arch): mystilleef
+
+pkgname=zramswap
+pkgver=1.1
+pkgrel=1
+pkgdesc="Sets up zram-based swap devices on boot"
+arch=('any')
+url="http://en.wikipedia.org/wiki/ZRam"
+license=('GPL')
+depends=('bash')
+source=("zramctrl"
+        "zramswap.service")
+md5sums=('709480a5f46fc4b6bea16800823240c1'
+         'a6c029dc942c85704b0f6ac1ca078a24')
+
+package() {
+  install -Dm755 zramctrl $pkgdir/usr/lib/systemd/scripts/zramctrl
+  install -Dm644 zramswap.service $pkgdir/usr/lib/systemd/system/zramswap.service
+}
diff --git a/pcr/zramswap/zramctrl b/pcr/zramswap/zramctrl
new file mode 100755
index 000000000..0165e769c
--- /dev/null
+++ b/pcr/zramswap/zramctrl
@@ -0,0 +1,50 @@
+#!/bin/sh
+
+
+start() {
+  exec awk -v ZRAM_SIZE=$ZRAM_SIZE -v ZRAM_PARM="$(modinfo zram | grep -E -o '(num_devices|zram_num_devices)')" '
+
+  FILENAME == "/proc/cpuinfo" && ($1 == "processor" || $1 == "Processor") {
+    cpucount++
+    next
+  }
+
+  FILENAME == "/proc/meminfo" && $1 == "MemTotal:" {
+    if (ZRAM_SIZE == "")
+      ZRAM_SIZE = 20
+    mem_total = int( (0 + $2) * 1024 * ( ZRAM_SIZE/100 ) )
+    next
+  }
+
+  END {
+    mem_per_cpu = int(mem_total / cpucount)
+
+    system("modprobe zram "ZRAM_PARM"=" cpucount)
+
+    for (i = 0; i < cpucount; i++) {
+      print mem_per_cpu > "/sys/block/zram" i "/disksize"
+      system("mkswap /dev/zram" i " -L zram" i)
+      swapdevs = swapdevs " /dev/zram" i
+    }
+
+    system("swapon -p 100" swapdevs)
+  }
+  ' /proc/cpuinfo /proc/meminfo
+}
+
+stop() {
+  exec awk '
+  FNR > 1 && $1 ~ /^\/dev\/zram[0-9]+$/ {
+    activeswaps = activeswaps " " $1
+  }
+
+  END {
+    system("swapoff" activeswaps)
+    system("rmmod zram")
+  }
+  ' /proc/swaps
+}
+
+case $1 in
+  start|stop) "$1" ;;
+esac
+\ No newline at end of file
diff --git a/pcr/zramswap/zramswap.service b/pcr/zramswap/zramswap.service
new file mode 100644
index 000000000..9c9cccd23
--- /dev/null
+++ b/pcr/zramswap/zramswap.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Zram-based swap (compressed RAM block devices)
+
+[Service]
+Type=oneshot
+ExecStart=/usr/lib/systemd/scripts/zramctrl start
+ExecStop=/usr/lib/systemd/scripts/zramctrl stop
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target
+\ No newline at end of file