Commit 23637d47 authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

lockup_detector: Introduce CONFIG_HARDLOCKUP_DETECTOR 



This new config is deemed to simplify even more the lockup detector
dependencies and can make it easier to bring a smooth sorting
between archs that support the new generic lockup detector and those
that still have their own, especially for those that are in the
middle of this migration.

Instead of checking whether we have CONFIG_LOCKUP_DETECTOR +
CONFIG_PERF_EVENTS_NMI each time an arch wants to know if it needs
to build its own lockup detector, take a shortcut with this new
config. It is enabled only if the hardlockup detection part of
the whole lockup detector is on.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
parent c01d4323

arch/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -147,5 +147,9 @@ config HAVE_USER_RETURN_NOTIFIER 


config HAVE_PERF_EVENTS_NMI

	bool

	help

	  System hardware can generate an NMI using the perf event

	  subsystem.  Also has support for calculating CPU cycle events

	  to determine how many clock cycles in a given period.



source "kernel/gcov/Kconfig"

init/Kconfig

+0 −7
Original line number Diff line number Diff line
@@ -942,13 +942,6 @@ config PERF_USE_VMALLOC 
	help

	  See tools/perf/design.txt for details



config PERF_EVENTS_NMI

	def_bool PERF_EVENTS && HAVE_PERF_EVENTS_NMI

	help

	  System hardware can generate an NMI using the perf event

	  subsystem.  Also has support for calculating CPU cycle events

	  to determine how many clock cycles in a given period.



menu "Kernel Performance Events And Counters"



config PERF_EVENTS

kernel/watchdog.c

+7 −7
Original line number Diff line number Diff line
@@ -37,7 +37,7 @@ static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer); 
static DEFINE_PER_CPU(bool, softlockup_touch_sync);

static DEFINE_PER_CPU(bool, hard_watchdog_warn);

static DEFINE_PER_CPU(bool, soft_watchdog_warn);

#ifdef CONFIG_PERF_EVENTS_NMI

#ifdef CONFIG_HARDLOCKUP_DETECTOR

static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts);

static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);

static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
@@ -51,7 +51,7 @@ static int __initdata no_watchdog; 
/*

 * Should we panic when a soft-lockup or hard-lockup occurs:

 */

#ifdef CONFIG_PERF_EVENTS_NMI

#ifdef CONFIG_HARDLOCKUP_DETECTOR

static int hardlockup_panic;



static int __init hardlockup_panic_setup(char *str)
@@ -152,7 +152,7 @@ void touch_softlockup_watchdog_sync(void) 
	__raw_get_cpu_var(watchdog_touch_ts) = 0;

}



#ifdef CONFIG_PERF_EVENTS_NMI

#ifdef CONFIG_HARDLOCKUP_DETECTOR

/* watchdog detector functions */

static int is_hardlockup(int cpu)

{
@@ -189,7 +189,7 @@ static struct notifier_block panic_block = { 
	.notifier_call = watchdog_panic,

};



#ifdef CONFIG_PERF_EVENTS_NMI

#ifdef CONFIG_HARDLOCKUP_DETECTOR

static struct perf_event_attr wd_hw_attr = {

	.type		= PERF_TYPE_HARDWARE,

	.config		= PERF_COUNT_HW_CPU_CYCLES,
@@ -239,7 +239,7 @@ static void watchdog_interrupt_count(void) 
}

#else

static inline void watchdog_interrupt_count(void) { return; }

#endif /* CONFIG_PERF_EVENTS_NMI */

#endif /* CONFIG_HARDLOCKUP_DETECTOR */



/* watchdog kicker functions */

static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
@@ -342,7 +342,7 @@ static int watchdog(void *__bind_cpu) 
}





#ifdef CONFIG_PERF_EVENTS_NMI

#ifdef CONFIG_HARDLOCKUP_DETECTOR

static int watchdog_nmi_enable(int cpu)

{

	struct perf_event_attr *wd_attr;
@@ -393,7 +393,7 @@ static void watchdog_nmi_disable(int cpu) 
#else

static int watchdog_nmi_enable(int cpu) { return 0; }

static void watchdog_nmi_disable(int cpu) { return; }

#endif /* CONFIG_PERF_EVENTS_NMI */

#endif /* CONFIG_HARDLOCKUP_DETECTOR */



/* prepare/enable/disable routines */

static int watchdog_prepare_cpu(int cpu)

lib/Kconfig.debug

+3 −0
Original line number Diff line number Diff line
@@ -174,6 +174,9 @@ config LOCKUP_DETECTOR 
	  generate interrupts and kick the watchdog task every 10-12 seconds.

	  An NMI is generated every 60 seconds or so to check for hardlockups.



config HARDLOCKUP_DETECTOR

	def_bool LOCKUP_DETECTOR && PERF_EVENTS && HAVE_PERF_EVENTS_NMI



config BOOTPARAM_SOFTLOCKUP_PANIC

	bool "Panic (Reboot) On Soft Lockups"

	depends on LOCKUP_DETECTOR

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