76 lines
2.0 KiB
Diff
76 lines
2.0 KiB
Diff
From: Dave Jones <davej@redhat.com>
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Date: Tue, 24 Jun 2014 08:43:34 -0400
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Subject: [PATCH] watchdog: Disable watchdog on virtual machines.
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For various reasons, VMs seem to trigger the soft lockup detector a lot,
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in cases where it's just not possible for a lockup to occur.
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(Example: https://bugzilla.redhat.com/show_bug.cgi?id=971139)
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In some cases it seems that the host just never scheduled the app running
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the VM for a very long time (Could be the host was under heavy load).
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Just disable the detector on VMs.
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Bugzilla: 971139
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Upstream-status: Fedora mustard for now
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Signed-off-by: Dave Jones <davej@redhat.com>
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---
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kernel/watchdog.c | 29 +++++++++++++++++++++++++++++
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1 file changed, 29 insertions(+)
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diff --git a/kernel/watchdog.c b/kernel/watchdog.c
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index 581a68a04c64..18b609d3360a 100644
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--- a/kernel/watchdog.c
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+++ b/kernel/watchdog.c
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@@ -19,6 +19,7 @@
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#include <linux/sysctl.h>
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#include <linux/smpboot.h>
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#include <linux/sched/rt.h>
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+#include <linux/dmi.h>
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#include <asm/irq_regs.h>
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#include <linux/kvm_para.h>
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@@ -148,6 +149,32 @@ static int __init softlockup_all_cpu_backtrace_setup(char *str)
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__setup("softlockup_all_cpu_backtrace=", softlockup_all_cpu_backtrace_setup);
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#endif
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+static int disable_watchdog(const struct dmi_system_id *d)
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+{
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+ printk(KERN_INFO "watchdog: disabled (inside virtual machine)\n");
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+ watchdog_user_enabled = 0;
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+ return 0;
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+}
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+
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+static const struct dmi_system_id watchdog_virt_dmi_table[] = {
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+ {
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+ .callback = disable_watchdog,
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+ .ident = "VMware",
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+ .matches = {
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+ DMI_MATCH(DMI_SYS_VENDOR, "VMware, Inc."),
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+ },
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+ },
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+ {
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+ .callback = disable_watchdog,
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+ .ident = "Bochs",
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+ .matches = {
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+ DMI_MATCH(DMI_SYS_VENDOR, "Bochs"),
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+ },
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+ },
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+ {}
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+};
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+
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+
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/*
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* Hard-lockup warnings should be triggered after just a few seconds. Soft-
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* lockups can have false positives under extreme conditions. So we generally
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@@ -883,6 +910,8 @@ out:
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void __init lockup_detector_init(void)
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{
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+ dmi_check_system(watchdog_virt_dmi_table);
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+
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set_sample_period();
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if (watchdog_enabled)
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