This setting will later be used to compute an expected steal time.
Signed-off-by: Michael Wolf <m...@linux.vnet.ibm.com>
---
Documentation/sysctl/kernel.txt | 14 ++++++++++++++
fs/proc/stat.c | 1 +
kernel/sysctl.c | 10 ++++++++++
3 files changed, 25 insertions(+)
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 6d78841..0f617dc 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -28,6 +28,7 @@ show up in /proc/sys/kernel:
- core_pattern
- core_pipe_limit
- core_uses_pid
+- cpu_entitlement
- ctrl-alt-del
- dmesg_restrict
- domainname
@@ -226,6 +227,19 @@ the filename.
==============================================================
+cpu_entitlement:
+
+The cpu_entitlement is the percentage of cpu utilization that
+the system expects to receive. By default this is set to 100,
+in a guest system this could be set to a value between 0 and 100.
+This value is used to adjust the amount of steal time that
+process accounting code in the guest will display. The end effect
+will be is that steal time will only be reported if the
+percentage of steal time is greater than 100 - cpu_entitlement
+value.
+
+==============================================================
+
ctrl-alt-del:
When the value in this file is 0, ctrl-alt-del is trapped and
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 64c3b31..14e26c8 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -12,6 +12,7 @@
#include <asm/cputime.h>
#include <linux/tick.h>
+int cpu_entitlement = 100;
#ifndef arch_irq_stat_cpu
#define arch_irq_stat_cpu(cpu) 0
#endif
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 87174ef..85efbc2 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -109,6 +109,7 @@ extern int percpu_pagelist_fraction;
extern int compat_log;
extern int latencytop_enabled;
extern int sysctl_nr_open_min, sysctl_nr_open_max;
+extern int cpu_entitlement;
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
@@ -673,6 +674,15 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+ {
+ .procname = "cpu_entitlement",
+ .data = &cpu_entitlement,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one_hundred,
+ },
#if defined CONFIG_PRINTK
{
.procname = "printk",
--
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