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SubjectRe: [ANNOUNCE] 3.8-rc4-nohz3
Hi,

This WARN_ON is triggered for every full nohz CPU in the system during
AP boot in a 16 core machine:

[ 0.336895] ------------[ cut here ]------------
[ 0.341508] WARNING: at arch/x86/kernel/smp.c:123
native_smp_send_reschedule+0x4f/0x60()
[ 0.349578] Hardware name: X8DTG-D
[ 0.315066] smpboot: Booting Node 0, Processors #1
[ 0.352978] Modules linked in:
[ 0.356233] Pid: 0, comm: swapper/1 Not tainted 3.8.0-rc4+ #3
[ 0.361959] Call Trace:
[ 0.364404] [<ffffffff8103c4fa>] warn_slowpath_common+0x7a/0xb0
[ 0.370399] [<ffffffff8103c545>] warn_slowpath_null+0x15/0x20
[ 0.376213] [<ffffffff8102435f>] native_smp_send_reschedule+0x4f/0x60
[ 0.382723] [<ffffffff8106b328>] wake_up_nohz_cpu+0x78/0x80
[ 0.388374] [<ffffffff8104c33a>] add_timer_on+0x8a/0xf0
[ 0.393679] [<ffffffff8101c6f4>] mce_start_timer+0x64/0x70
[ 0.399241] [<ffffffff8101c752>] __mcheck_cpu_init_timer+0x52/0x60
[ 0.405490] [<ffffffff817d804a>] mcheck_cpu_init+0x360/0x3d9
[ 0.411226] [<ffffffff817d6160>] identify_cpu+0x39d/0x3ba
[ 0.416696] [<ffffffff817d6193>] identify_secondary_cpu+0x16/0x1d
[ 0.422855] [<ffffffff817d9730>] smp_store_cpu_info+0x38/0x3a
[ 0.428672] [<ffffffff817d981a>] start_secondary+0xe8/0x192
[ 0.434317] ---[ end trace 17bfa0d8291c432e ]---

The machine seems to be working just fine.

FYI.

On Tue, Jan 22, 2013 at 5:34 PM, Frederic Weisbecker <fweisbec@gmail.com> wrote:
> Hi,
>
> This version of the full dynticks patchset integrates the latest full
> dynticks cputime accounting changes (see https://lkml.org/lkml/2013/1/22/652)
> and is rebased against 3.8-rc4.
>
> All of these patches have been posted already so I'm not spamming
> you again.
>
> You can pull from:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 3.8-rc4-nohz3
>
> So this fixes and improve a lot of things since 3.8-rc2-nohz2:
>
> - Use sched_clock() instead of jiffies for better precision. And because
> jiffies granularity was requiring too much dirty hacks to make it working.
> (Thanks Steven for the suggestion).
>
> - To fully support sched_clock(), use a per nanosec granularity in cputime_t
>
> - Fix a deadlock with tsacct
>
> - Better description of the Kconfig
>
> - Don't scale generic vtime accounting against CFS precise task time accounting.
> Now that we use sched_clock() we should have precise enough statistics.
>
> - Consolidate some code in the reader side
>
> - Make the reader irqsafe (fix potential deadlock against writers)
>
> - Handle guest cputime
>
> - Handle idle tasks. Those were special because they don't start from schedule()
> so they need their own initializations.
>
> - Fix build error with CONFIG_IRQ_TIME_ACCOUNTING (thanks Wu Fenguang)
>
> - Depend on 64 bits archs to make kernel_cpustat reading to be atomic
>
>
> Thanks.
>
> ---
> Frederic Weisbecker (44):
> irq_work: Fix racy IRQ_WORK_BUSY flag setting
> irq_work: Fix racy check on work pending flag
> irq_work: Remove CONFIG_HAVE_IRQ_WORK
> nohz: Add API to check tick state
> irq_work: Don't stop the tick with pending works
> irq_work: Make self-IPIs optable
> printk: Wake up klogd using irq_work
> context_tracking: Add comments on interface and internals
> context_tracking: Export context state for generic vtime
> cputime: Librarize per nsecs resolution cputime definitions
> cputime: Move default nsecs_to_cputime() to jiffies based cputime file
> cputime: Generic on-demand virtual cputime accounting
> cputime: Allow dynamic switch between tick/virtual based cputime accounting
> cputime: Use accessors to read task cputime stats
> kvm: Prepare to add generic guest entry/exit callbacks
> cputime: Safely read cputime of full dynticks CPUs
> Merge branch 'nohz/printk-v8'
> nohz: Basic full dynticks interface
> nohz: Assign timekeeping duty to a non-full-nohz CPU
> nohz: Trace timekeeping update
> nohz: Wake up full dynticks CPUs when a timer gets enqueued
> rcu: Restart the tick on non-responding full dynticks CPUs
> sched: Comment on rq->clock correctness in ttwu_do_wakeup() in nohz
> sched: Update rq clock on nohz CPU before migrating tasks
> sched: Update rq clock on nohz CPU before setting fair group shares
> sched: Update rq clock on tickless CPUs before calling check_preempt_curr()
> sched: Update rq clock earlier in unthrottle_cfs_rq
> sched: Update clock of nohz busiest rq before balancing
> sched: Update rq clock before idle balancing
> sched: Update nohz rq clock before searching busiest group on load balancing
> nohz: Move nohz load balancer selection into idle logic
> nohz: Full dynticks mode
> nohz: Only stop the tick on RCU nocb CPUs
> nohz: Don't turn off the tick if rcu needs it
> nohz: Don't stop the tick if posix cpu timers are running
> nohz: Add some tracing
> rcu: Don't keep the tick for RCU while in userspace
> profiling: Remove unused timer hook
> timer: Don't run non-pinned timer to full dynticks CPUs
> sched: Use an accessor to read rq clock
> sched: Debug nohz rq clock
> sched: Remove broken check for skip clock update
> sched: Update rq clock before rt sched average scale
> sched: Disable lb_bias feature for full dynticks
>
> Steven Rostedt (2):
> irq_work: Flush work on CPU_DYING
> irq_work: Warn if there's still work on cpu_down
>
> arch/alpha/Kconfig | 1 -
> arch/alpha/kernel/osf_sys.c | 6 +-
> arch/arm/Kconfig | 1 -
> arch/arm64/Kconfig | 1 -
> arch/blackfin/Kconfig | 1 -
> arch/frv/Kconfig | 1 -
> arch/hexagon/Kconfig | 1 -
> arch/ia64/include/asm/cputime.h | 92 +--------
> arch/ia64/include/asm/thread_info.h | 4 +-
> arch/ia64/include/asm/xen/minstate.h | 2 +-
> arch/ia64/kernel/asm-offsets.c | 2 +-
> arch/ia64/kernel/entry.S | 16 +-
> arch/ia64/kernel/fsys.S | 4 +-
> arch/ia64/kernel/head.S | 4 +-
> arch/ia64/kernel/ivt.S | 8 +-
> arch/ia64/kernel/minstate.h | 2 +-
> arch/ia64/kernel/time.c | 4 +-
> arch/mips/Kconfig | 1 -
> arch/parisc/Kconfig | 1 -
> arch/powerpc/Kconfig | 1 -
> arch/powerpc/configs/chroma_defconfig | 2 +-
> arch/powerpc/configs/corenet64_smp_defconfig | 2 +-
> arch/powerpc/configs/pasemi_defconfig | 2 +-
> arch/powerpc/include/asm/cputime.h | 6 +-
> arch/powerpc/include/asm/lppaca.h | 2 +-
> arch/powerpc/include/asm/ppc_asm.h | 4 +-
> arch/powerpc/kernel/entry_64.S | 4 +-
> arch/powerpc/kernel/time.c | 4 +-
> arch/powerpc/platforms/pseries/dtl.c | 6 +-
> arch/powerpc/platforms/pseries/setup.c | 6 +-
> arch/s390/Kconfig | 1 -
> arch/s390/kernel/vtime.c | 6 +-
> arch/sh/Kconfig | 1 -
> arch/sparc/Kconfig | 1 -
> arch/x86/Kconfig | 1 -
> arch/x86/kernel/apm_32.c | 11 +-
> drivers/isdn/mISDN/stack.c | 7 +-
> drivers/staging/iio/trigger/Kconfig | 1 -
> fs/binfmt_elf.c | 8 +-
> fs/binfmt_elf_fdpic.c | 7 +-
> fs/proc/array.c | 4 +-
> include/asm-generic/cputime.h | 66 +-----
> include/asm-generic/cputime_jiffies.h | 72 ++++++
> include/asm-generic/cputime_nsecs.h | 104 +++++++++
> include/linux/context_tracking.h | 28 +++
> include/linux/hardirq.h | 4 +-
> include/linux/init_task.h | 11 +
> include/linux/irq_work.h | 20 ++
> include/linux/kernel_stat.h | 2 +-
> include/linux/kvm_host.h | 55 ++++-
> include/linux/posix-timers.h | 1 +
> include/linux/printk.h | 3 -
> include/linux/profile.h | 13 --
> include/linux/rcupdate.h | 8 +
> include/linux/sched.h | 50 ++++-
> include/linux/tick.h | 26 +++-
> include/linux/tsacct_kern.h | 3 +
> include/linux/vtime.h | 59 ++++--
> init/Kconfig | 28 ++-
> kernel/acct.c | 6 +-
> kernel/context_tracking.c | 110 ++++++++---
> kernel/cpu.c | 4 +-
> kernel/delayacct.c | 7 +-
> kernel/exit.c | 10 +-
> kernel/fork.c | 6 +
> kernel/hrtimer.c | 3 +-
> kernel/irq_work.c | 131 +++++++++---
> kernel/posix-cpu-timers.c | 39 +++-
> kernel/printk.c | 36 ++--
> kernel/profile.c | 24 --
> kernel/rcutree.c | 19 ++-
> kernel/rcutree.h | 1 -
> kernel/rcutree_plugin.h | 13 +-
> kernel/sched/core.c | 105 ++++++++-
> kernel/sched/cputime.c | 298 +++++++++++++++++++++++---
> kernel/sched/fair.c | 96 ++++++---
> kernel/sched/features.h | 3 +
> kernel/sched/rt.c | 8 +-
> kernel/sched/sched.h | 50 +++++
> kernel/sched/stats.h | 8 +-
> kernel/sched/stop_task.c | 8 +-
> kernel/signal.c | 12 +-
> kernel/softirq.c | 11 +-
> kernel/time/Kconfig | 9 +
> kernel/time/tick-broadcast.c | 3 +-
> kernel/time/tick-common.c | 5 +-
> kernel/time/tick-sched.c | 144 +++++++++++--
> kernel/timer.c | 6 +-
> kernel/tsacct.c | 44 +++-
> 89 files changed, 1489 insertions(+), 522 deletions(-)


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