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Dave Jones |
7145a23 |
Disable watchdog on virtual machines.
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
For various reasons, VMs seem to trigger the soft lockup detector a lot,
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Dave Jones |
7145a23 |
in cases where it's just not possible for a lockup to occur.
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Dave Jones |
7145a23 |
(Example: https://bugzilla.redhat.com/show_bug.cgi?id=971139)
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
In some cases it seems that the host just never scheduled the app running
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Dave Jones |
7145a23 |
the VM for a very long time (Could be the host was under heavy load).
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
Just disable the detector on VMs.
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
Signed-off-by: Dave Jones <davej@redhat.com>
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
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Dave Jones |
7145a23 |
index 05039e3..a28aab9 100644
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Dave Jones |
7145a23 |
--- a/kernel/watchdog.c
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Dave Jones |
7145a23 |
+++ b/kernel/watchdog.c
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Dave Jones |
7145a23 |
@@ -24,6 +24,7 @@
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Dave Jones |
7145a23 |
#include <linux/sysctl.h>
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Dave Jones |
7145a23 |
#include <linux/smpboot.h>
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Dave Jones |
7145a23 |
#include <linux/sched/rt.h>
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Dave Jones |
7145a23 |
+#include <linux/dmi.h>
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
#include <asm/irq_regs.h>
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Dave Jones |
7145a23 |
#include <linux/kvm_para.h>
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Dave Jones |
7145a23 |
@@ -96,6 +97,32 @@ static int __init nosoftlockup_setup(char *str)
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Dave Jones |
7145a23 |
__setup("nosoftlockup", nosoftlockup_setup);
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Dave Jones |
7145a23 |
/* */
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
+static int disable_watchdog(const struct dmi_system_id *d)
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Dave Jones |
7145a23 |
+{
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Dave Jones |
7145a23 |
+ printk(KERN_INFO "watchdog: disabled (inside virtual machine)\n");
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Dave Jones |
7145a23 |
+ watchdog_enabled = 0;
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Dave Jones |
7145a23 |
+ return 0;
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Dave Jones |
7145a23 |
+}
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Dave Jones |
7145a23 |
+
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Dave Jones |
7145a23 |
+static const struct dmi_system_id watchdog_virt_dmi_table[] = {
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Dave Jones |
7145a23 |
+ {
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Dave Jones |
7145a23 |
+ .callback = disable_watchdog,
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Dave Jones |
7145a23 |
+ .ident = "VMware",
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Dave Jones |
7145a23 |
+ .matches = {
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Dave Jones |
7145a23 |
+ DMI_MATCH(DMI_SYS_VENDOR, "VMware, Inc."),
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Dave Jones |
7145a23 |
+ },
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Dave Jones |
7145a23 |
+ },
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Dave Jones |
7145a23 |
+ {
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Dave Jones |
7145a23 |
+ .callback = disable_watchdog,
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Dave Jones |
7145a23 |
+ .ident = "Bochs",
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Dave Jones |
7145a23 |
+ .matches = {
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Dave Jones |
7145a23 |
+ DMI_MATCH(DMI_SYS_VENDOR, "Bochs Bochs"),
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Dave Jones |
7145a23 |
+ },
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Dave Jones |
7145a23 |
+ },
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Dave Jones |
7145a23 |
+ {}
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Dave Jones |
7145a23 |
+};
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Dave Jones |
7145a23 |
+
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Dave Jones |
7145a23 |
+
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Dave Jones |
7145a23 |
/*
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Dave Jones |
7145a23 |
* Hard-lockup warnings should be triggered after just a few seconds. Soft-
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Dave Jones |
7145a23 |
* lockups can have false positives under extreme conditions. So we generally
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Dave Jones |
7145a23 |
@@ -543,6 +570,8 @@ static struct smp_hotplug_thread watchdog_threads = {
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Dave Jones |
7145a23 |
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Dave Jones |
7145a23 |
void __init lockup_detector_init(void)
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Dave Jones |
7145a23 |
{
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Dave Jones |
7145a23 |
+ dmi_check_system(watchdog_virt_dmi_table);
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Dave Jones |
7145a23 |
+
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Dave Jones |
7145a23 |
set_sample_period();
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Dave Jones |
7145a23 |
if (smpboot_register_percpu_thread(&watchdog_threads)) {
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Dave Jones |
7145a23 |
pr_err("Failed to create watchdog threads, disabled\n");
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