68 lines
1.8 KiB
Diff
68 lines
1.8 KiB
Diff
Disable watchdog on virtual machines.
|
|
|
|
For various reasons, VMs seem to trigger the soft lockup detector a lot,
|
|
in cases where it's just not possible for a lockup to occur.
|
|
(Example: https://bugzilla.redhat.com/show_bug.cgi?id=971139)
|
|
|
|
In some cases it seems that the host just never scheduled the app running
|
|
the VM for a very long time (Could be the host was under heavy load).
|
|
|
|
Just disable the detector on VMs.
|
|
|
|
Signed-off-by: Dave Jones <davej@redhat.com>
|
|
|
|
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
|
|
index 1241d8c..b2dc4e4 100644
|
|
--- a/kernel/watchdog.c
|
|
+++ b/kernel/watchdog.c
|
|
@@ -24,6 +24,7 @@
|
|
#include <linux/sysctl.h>
|
|
#include <linux/smpboot.h>
|
|
#include <linux/sched/rt.h>
|
|
+#include <linux/dmi.h>
|
|
|
|
#include <asm/irq_regs.h>
|
|
#include <linux/kvm_para.h>
|
|
@@ -96,6 +97,32 @@ static int __init nosoftlockup_setup(char *str)
|
|
__setup("nosoftlockup", nosoftlockup_setup);
|
|
/* */
|
|
|
|
+static int disable_watchdog(const struct dmi_system_id *d)
|
|
+{
|
|
+ printk(KERN_INFO "watchdog: disabled (inside virtual machine)\n");
|
|
+ watchdog_user_enabled = 0;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static const struct dmi_system_id watchdog_virt_dmi_table[] = {
|
|
+ {
|
|
+ .callback = disable_watchdog,
|
|
+ .ident = "VMware",
|
|
+ .matches = {
|
|
+ DMI_MATCH(DMI_SYS_VENDOR, "VMware, Inc."),
|
|
+ },
|
|
+ },
|
|
+ {
|
|
+ .callback = disable_watchdog,
|
|
+ .ident = "Bochs",
|
|
+ .matches = {
|
|
+ DMI_MATCH(DMI_SYS_VENDOR, "Bochs Bochs"),
|
|
+ },
|
|
+ },
|
|
+ {}
|
|
+};
|
|
+
|
|
+
|
|
/*
|
|
* Hard-lockup warnings should be triggered after just a few seconds. Soft-
|
|
* lockups can have false positives under extreme conditions. So we generally
|
|
@@ -551,6 +578,8 @@ int proc_dowatchdog(struct ctl_table *table, int write,
|
|
|
|
void __init lockup_detector_init(void)
|
|
{
|
|
+ dmi_check_system(watchdog_virt_dmi_table);
|
|
+
|
|
set_sample_period();
|
|
|
|
#ifdef CONFIG_NO_HZ_FULL
|