packages: qemu-kvm/ksm.service (NEW), qemu-kvm/ksm.sysconfig (NEW), qemu-kv...
baggins
baggins at pld-linux.org
Thu Feb 16 15:18:04 CET 2012
Author: baggins Date: Thu Feb 16 14:18:04 2012 GMT
Module: packages Tag: HEAD
---- Log message:
- kernel samepage merging services for qemu
---- Files affected:
packages/qemu-kvm:
ksm.service (NONE -> 1.1) (NEW), ksm.sysconfig (NONE -> 1.1) (NEW), ksmctl.c (NONE -> 1.1) (NEW), ksmtuned (NONE -> 1.1) (NEW), ksmtuned.conf (NONE -> 1.1) (NEW), ksmtuned.service (NONE -> 1.1) (NEW)
---- Diffs:
================================================================
Index: packages/qemu-kvm/ksm.service
diff -u /dev/null packages/qemu-kvm/ksm.service:1.1
--- /dev/null Thu Feb 16 15:18:04 2012
+++ packages/qemu-kvm/ksm.service Thu Feb 16 15:17:58 2012
@@ -0,0 +1,13 @@
+[Unit]
+Description=Kernel Samepage Merging
+ConditionPathExists=/sys/kernel/mm/ksm
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+EnvironmentFile=-/etc/sysconfig/ksm
+ExecStart=/usr/sbin/ksmctl start
+ExecStop=/usr/sbin/ksmctl stop
+
+[Install]
+WantedBy=multi-user.target
================================================================
Index: packages/qemu-kvm/ksm.sysconfig
diff -u /dev/null packages/qemu-kvm/ksm.sysconfig:1.1
--- /dev/null Thu Feb 16 15:18:04 2012
+++ packages/qemu-kvm/ksm.sysconfig Thu Feb 16 15:17:58 2012
@@ -0,0 +1,4 @@
+# The maximum number of unswappable kernel pages
+# which may be allocated by ksm (0 for unlimited)
+# If unset, defaults to half of total memory
+# KSM_MAX_KERNEL_PAGES=
================================================================
Index: packages/qemu-kvm/ksmctl.c
diff -u /dev/null packages/qemu-kvm/ksmctl.c:1.1
--- /dev/null Thu Feb 16 15:18:04 2012
+++ packages/qemu-kvm/ksmctl.c Thu Feb 16 15:17:58 2012
@@ -0,0 +1,77 @@
+/* Start/stop KSM, for systemd.
+ * Copyright (C) 2009, 2011 Red Hat, Inc.
+ * Written by Paolo Bonzini <pbonzini at redhat.com>.
+ * Based on the original sysvinit script by Dan Kenigsberg <danken at redhat.com>
+ * This file is distributed under the GNU General Public License, version 2
+ * or later. */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define KSM_MAX_KERNEL_PAGES_FILE "/sys/kernel/mm/ksm/max_kernel_pages"
+#define KSM_RUN_FILE "/sys/kernel/mm/ksm/run"
+
+char *program_name;
+
+int usage(void)
+{
+ fprintf(stderr, "Usage: %s {start|stop}\n", program_name);
+ return 1;
+}
+
+int write_value(uint64_t value, char *filename)
+{
+ FILE *fp;
+ if (!(fp = fopen(filename, "w")) ||
+ fprintf(fp, "%llu\n", (unsigned long long) value) == EOF ||
+ fflush(fp) == EOF ||
+ fclose(fp) == EOF)
+ return 1;
+
+ return 0;
+}
+
+uint64_t ksm_max_kernel_pages()
+{
+ char *var = getenv("KSM_MAX_KERNEL_PAGES");
+ char *endptr;
+ uint64_t value;
+ if (var && *var) {
+ value = strtoll(var, &endptr, 0);
+ if (value < LLONG_MAX && !*endptr)
+ return value;
+ }
+ /* Unless KSM_MAX_KERNEL_PAGES is set, let KSM munch up to half of
+ * total memory. */
+ return sysconf(_SC_PHYS_PAGES) / 2;
+}
+
+int start(void)
+{
+ if (access(KSM_MAX_KERNEL_PAGES_FILE, R_OK) >= 0)
+ write_value(ksm_max_kernel_pages(), KSM_MAX_KERNEL_PAGES_FILE);
+ return write_value(1, KSM_RUN_FILE);
+}
+
+int stop(void)
+{
+ return write_value(0, KSM_RUN_FILE);
+}
+
+int main(int argc, char **argv)
+{
+ program_name = argv[0];
+ if (argc < 2) {
+ return usage();
+ } else if (!strcmp(argv[1], "start")) {
+ return start();
+ } else if (!strcmp(argv[1], "stop")) {
+ return stop();
+ } else {
+ return usage();
+ }
+}
================================================================
Index: packages/qemu-kvm/ksmtuned
diff -u /dev/null packages/qemu-kvm/ksmtuned:1.1
--- /dev/null Thu Feb 16 15:18:04 2012
+++ packages/qemu-kvm/ksmtuned Thu Feb 16 15:17:58 2012
@@ -0,0 +1,133 @@
+#!/bin/sh
+#
+# Copyright 2009 Red Hat, Inc. and/or its affiliates.
+# Released under the GPL
+#
+# Author: Dan Kenigsberg <danken at redhat.com>
+# un-bash-ed: Jan Rękorajski <baggins at pld-linux.org>
+#
+# ksmtuned - a simple script that controls whether (and with what vigor) ksm
+# should search for duplicated pages.
+#
+# starts ksm when memory commited to qemu processes exceeds a threshold, and
+# make ksm work harder and harder untill memory load falls below that
+# threshold.
+#
+# send SIGUSR1 to this process right after a new qemu process is started, or
+# following its death, to retune ksm accordingly
+
+[ -f /etc/ksmtuned.conf ] && . /etc/ksmtuned.conf
+
+debug() {
+ if [ -n "$DEBUG" ]; then
+ s="`/bin/date`: $*"
+ [ -n "$LOGFILE" ] && echo "$s" >> "$LOGFILE" || echo "$s"
+ fi
+}
+
+KSM_MONITOR_INTERVAL=${KSM_MONITOR_INTERVAL:-60}
+KSM_NPAGES_BOOST=${KSM_NPAGES_BOOST:-300}
+KSM_NPAGES_DECAY=${KSM_NPAGES_DECAY:--50}
+
+KSM_NPAGES_MIN=${KSM_NPAGES_MIN:-64}
+KSM_NPAGES_MAX=${KSM_NPAGES_MAX:-1250}
+# millisecond sleep between ksm scans for 16Gb server. Smaller servers sleep
+# more, bigger sleep less.
+KSM_SLEEP_MSEC=${KSM_SLEEP_MSEC:-10}
+
+KSM_THRES_COEF=${KSM_THRES_COEF:-20}
+KSM_THRES_CONST=${KSM_THRES_CONST:-2048}
+
+total=`awk '/^MemTotal:/ {print $2}' /proc/meminfo`
+debug total $total
+
+npages=0
+sleep=$(( $KSM_SLEEP_MSEC * 16 * 1024 * 1024 / $total ))
+[ $sleep -le 10 ] && sleep=10
+debug sleep $sleep
+thres=$(( $total * $KSM_THRES_COEF / 100 ))
+if [ $KSM_THRES_CONST -gt $thres ]; then
+ thres=$KSM_THRES_CONST
+fi
+debug thres $thres
+
+KSMCTL () {
+ case x$1 in
+ xstop)
+ echo 0 > /sys/kernel/mm/ksm/run
+ ;;
+ xstart)
+ echo $2 > /sys/kernel/mm/ksm/pages_to_scan
+ echo $3 > /sys/kernel/mm/ksm/sleep_millisecs
+ echo 1 > /sys/kernel/mm/ksm/run
+ ;;
+ esac
+}
+
+committed_memory () {
+ # calculate how much memory is committed to running qemu processes
+ local progname
+ progname=${1:-qemu-kvm}
+ ps -C "$progname" -o rsz | awk '{ sum += $1 }; END { print sum }'
+}
+
+free_memory () {
+ awk '/^(MemFree|Buffers|Cached):/ {free += $2}; END {print free}' \
+ /proc/meminfo
+}
+
+increase_npages() {
+ local delta
+ delta=${1:-0}
+ npages=$(( $npages + $delta ))
+ if [ $npages -lt $KSM_NPAGES_MIN ]; then
+ npages=$KSM_NPAGES_MIN
+ elif [ $npages -gt $KSM_NPAGES_MAX ]; then
+ npages=$KSM_NPAGES_MAX
+ fi
+ echo $npages
+}
+
+
+adjust () {
+ local free committed
+ free=`free_memory`
+ committed=`committed_memory`
+ debug committed $committed free $free
+ if [ $(( $committed + $thres )) -lt $total -a $free -gt $thres ]; then
+ KSMCTL stop
+ debug "$(( $committed + $thres )) < $total and free > $thres, stop ksm"
+ return 1
+ fi
+ debug "$(( $committed + $thres )) > $total, start ksm"
+ if [ $free -lt $thres ]; then
+ npages=`increase_npages $KSM_NPAGES_BOOST`
+ debug "$free < $thres, boost"
+ else
+ npages=`increase_npages $KSM_NPAGES_DECAY`
+ debug "$free > $thres, decay"
+ fi
+ KSMCTL start $npages $sleep
+ debug "KSMCTL start $npages $sleep"
+ return 0
+}
+
+nothing () {
+ :
+}
+
+loop () {
+ trap nothing SIGUSR1
+ while true
+ do
+ sleep $KSM_MONITOR_INTERVAL &
+ wait $!
+ adjust
+ done
+}
+
+PIDFILE=${PIDFILE-/var/run/ksmtune.pid}
+if touch "$PIDFILE"; then
+ loop &
+ echo $! > "$PIDFILE"
+fi
================================================================
Index: packages/qemu-kvm/ksmtuned.conf
diff -u /dev/null packages/qemu-kvm/ksmtuned.conf:1.1
--- /dev/null Thu Feb 16 15:18:04 2012
+++ packages/qemu-kvm/ksmtuned.conf Thu Feb 16 15:17:58 2012
@@ -0,0 +1,21 @@
+# Configuration file for ksmtuned.
+
+# How long ksmtuned should sleep between tuning adjustments
+# KSM_MONITOR_INTERVAL=60
+
+# Millisecond sleep between ksm scans for 16Gb server.
+# Smaller servers sleep more, bigger sleep less.
+# KSM_SLEEP_MSEC=10
+
+# KSM_NPAGES_BOOST=300
+# KSM_NPAGES_DECAY=-50
+# KSM_NPAGES_MIN=64
+# KSM_NPAGES_MAX=1250
+
+# KSM_THRES_COEF=20
+# KSM_THRES_CONST=2048
+
+# uncomment the following if you want ksmtuned debug info
+
+# LOGFILE=/var/log/ksmtuned
+# DEBUG=1
================================================================
Index: packages/qemu-kvm/ksmtuned.service
diff -u /dev/null packages/qemu-kvm/ksmtuned.service:1.1
--- /dev/null Thu Feb 16 15:18:04 2012
+++ packages/qemu-kvm/ksmtuned.service Thu Feb 16 15:17:58 2012
@@ -0,0 +1,12 @@
+[Unit]
+Description=Kernel Samepage Merging (KSM) Tuning Daemon
+After=ksm.service
+Requires=ksm.service
+
+[Service]
+ExecStart=/usr/sbin/ksmtuned
+ExecReload=/bin/kill -USR1 $MAINPID
+Type=forking
+
+[Install]
+WantedBy=multi-user.target
================================================================
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