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Ingo Molnar 8446f1d391 [PATCH] detect soft lockups

This patch adds a new kernel debug feature: CONFIG_DETECT_SOFTLOCKUP.

When enabled then per-CPU watchdog threads are started, which try to run
once per second.  If they get delayed for more than 10 seconds then a
callback from the timer interrupt detects this condition and prints out a
warning message and a stack dump (once per lockup incident).  The feature
is otherwise non-intrusive, it doesnt try to unlock the box in any way, it
only gets the debug info out, automatically, and on all CPUs affected by
the lockup.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-Off-By: Matthias Urlichs <smurf@smurf.noris.de>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2005-09-07 16:57:17 -07:00

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Makefile for the linux kernel.

obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o
exit.o itimer.o time.o softirq.o resource.o
sysctl.o capability.o ptrace.o timer.o user.o
signal.o sys.o kmod.o workqueue.o pid.o
rcupdate.o intermodule.o extable.o params.o posix-timers.o
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o

obj-$(CONFIG_FUTEX) += futex.o obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o obj-$(CONFIG_SMP) += cpu.o spinlock.o obj-$(CONFIG_UID16) += uid16.o obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_KALLSYMS) += kallsyms.o obj-$(CONFIG_PM) += power/ obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o obj-$(CONFIG_KEXEC) += kexec.o obj-$(CONFIG_COMPAT) += compat.o obj-$(CONFIG_CPUSETS) += cpuset.o obj-$(CONFIG_IKCONFIG) += configs.o obj-$(CONFIG_IKCONFIG_PROC) += configs.o obj-$(CONFIG_STOP_MACHINE) += stop_machine.o obj-$(CONFIG_AUDIT) += audit.o obj-$(CONFIG_AUDITSYSCALL) += auditsc.o obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_SYSFS) += ksysfs.o obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o obj-$(CONFIG_GENERIC_HARDIRQS) += irq/ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_SECCOMP) += seccomp.o

ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)

According to Alan Modra alan@linuxcare.com.au, the -fno-omit-frame-pointer is

needed for x86 only. Why this used to be enabled for all architectures is beyond

me. I suspect most platforms don't need this, but until we know that for sure

I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k

to get a correct value for the wait-channel (WCHAN in ps). --davidm

CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer endif

$(obj)/configs.o: $(obj)/config_data.h

config_data.h contains the same information as ikconfig.h but gzipped.

Info from config_data can be extracted from /proc/config*

targets += config_data.gz $(obj)/config_data.gz: .config FORCE $(call if_changed,gzip)

quiet_cmd_ikconfiggz = IKCFG $@ cmd_ikconfiggz = (echo "static const char kernel_config_data[] = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@ targets += config_data.h $(obj)/config_data.h: $(obj)/config_data.gz FORCE $(call if_changed,ikconfiggz)

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