From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>,
Arjan van de Ven <arjan@linux.intel.com>,
lenb@kernel.org, rjw@rjwysocki.net,
Eliezer Tamir <eliezer.tamir@linux.intel.com>,
rui.zhang@intel.com, jacob.jun.pan@linux.intel.com,
Mike Galbraith <bitbucket@online.de>,
Ingo Molnar <mingo@kernel.org>,
hpa@zytor.com, paulmck@linux.vnet.ibm.com,
Thomas Gleixner <tglx@linutronix.de>,
John Stultz <john.stultz@linaro.org>,
Andy Lutomirski <luto@amacapital.net>,
linux-kernel@vger.kernel.org, dyoung@redhat.com
Subject: Re: [PATCH 13/15] sched: Use a static_key for sched_clock_stable
Date: Wed, 22 Jan 2014 13:00:48 +0100 [thread overview]
Message-ID: <20140122120048.GB389@x4> (raw)
In-Reply-To: <20140122104532.GJ31570@twins.programming.kicks-ass.net>
On 2014.01.22 at 11:45 +0100, Peter Zijlstra wrote:
> On Tue, Jan 21, 2014 at 05:28:37PM -0500, Sasha Levin wrote:
> > On 12/12/2013 09:08 AM, Peter Zijlstra wrote:
> >
> > This patch seems to be causing an issue with booting a KVM guest. It seems that it
> > causes the time to go random during early boot process:
> >
> > [ 0.000000] Initmem setup node 30 [mem 0x12ee000000-0x138dffffff]
> > [ 0.000000] NODE_DATA [mem 0xcfa42000-0xcfa72fff]
> > [ 0.000000] NODE_DATA(30) on node 1
> > [ 0.000000] Initmem setup node 31 [mem 0x138e000000-0x142fffffff]
> > [ 0.000000] NODE_DATA [mem 0xcfa11000-0xcfa41fff]
> > [ 0.000000] NODE_DATA(31) on node 1
> > [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
> > [ 0.000000] kvm-clock: cpu 0, msr 0:cf991001, boot clock
> > [133538.294040] Zone ranges:
> > [133538.294338] DMA [mem 0x00001000-0x00ffffff]
> > [133538.294804] DMA32 [mem 0x01000000-0xffffffff]
> > [133538.295223] Normal [mem 0x100000000-0x142fffffff]
> > [133538.295670] Movable zone start for each node
> >
FYI it happens on real hardware on my machine:
...
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS:4352 nr_irqs:712 16
[ 0.000000] spurious 8259A interrupt: IRQ7.
[ 0.000000] Console: colour VGA+ 80x25
[ 0.000000] console [tty0] enabled
[ 0.000000] hpet clockevent registered
[ 0.000000] tsc: Fast TSC calibration using PIT
[ 0.003333] tsc: Detected 3210.681 MHz processor
[ 60.375238] Calibrating delay loop (skipped), value calculated using timer frequency.. 6423.91 BogoMIPS (lpj=10702270)
[ 60.375240] pid_max: default: 32768 minimum: 301
[ 60.375259] Mount-cache hash table entries: 256
[ 60.375373] tseg: 0000000000
[ 60.375377] CPU: Physical Processor ID: 0
[ 60.375377] CPU: Processor Core ID: 0
[ 60.375378] mce: CPU supports 6 MCE banks
[ 60.375382] LVT offset 0 assigned for vector 0xf9
[ 60.375384] process: using AMD E400 aware idle routine
[ 60.375386] Last level iTLB entries: 4KB 512, 2MB 16, 4MB 8
...
--
Markus
next prev parent reply other threads:[~2014-01-22 12:00 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-12 14:08 [PATCH 00/15] cleanups and optimizations Peter Zijlstra
2013-12-12 14:08 ` [PATCH 01/15] x86, acpi, idle: Restructure the mwait idle routines Peter Zijlstra
2013-12-19 20:09 ` [tip:x86/idle] " tip-bot for Peter Zijlstra
2013-12-19 20:13 ` H. Peter Anvin
2013-12-19 20:16 ` Peter Zijlstra
2013-12-12 14:08 ` [PATCH 02/15] sched, preempt: Fixup missed PREEMPT_NEED_RESCHED folding Peter Zijlstra
2013-12-12 14:08 ` [PATCH 03/15] preempt, locking: Rework local_bh_{dis,en}able() Peter Zijlstra
2013-12-12 14:08 ` [PATCH 04/15] locking: Optimize lock_bh functions Peter Zijlstra
2013-12-12 14:08 ` [PATCH 05/15] sched, net: Clean up preempt_enable_no_resched() abuse Peter Zijlstra
2013-12-12 14:08 ` [PATCH 06/15] sched, net: Fixup busy_loop_us_clock() Peter Zijlstra
2013-12-12 14:08 ` [PATCH 07/15] sched, thermal: Clean up preempt_enable_no_resched() abuse Peter Zijlstra
2013-12-12 14:08 ` [PATCH 08/15] preempt: Take away preempt_enable_no_resched() from modules Peter Zijlstra
2013-12-12 14:08 ` [PATCH 09/15] x86: Use mul_u64_u32_shr() for native_sched_clock() Peter Zijlstra
2013-12-12 14:08 ` [PATCH 10/15] x86: Move some code around Peter Zijlstra
2013-12-12 14:08 ` [PATCH 11/15] x86: Rewrite cyc2ns to avoid the need to disable IRQs Peter Zijlstra
2014-06-16 17:13 ` Viresh Kumar
2014-06-17 12:15 ` Peter Zijlstra
2014-06-17 12:42 ` Viresh Kumar
2014-06-17 16:32 ` Mauro
2014-06-17 12:47 ` Mauro
2013-12-12 14:08 ` [PATCH 12/15] sched: Remove local_irq_disable() from the clocks Peter Zijlstra
2013-12-12 14:08 ` [PATCH 13/15] sched: Use a static_key for sched_clock_stable Peter Zijlstra
2014-01-21 22:28 ` Sasha Levin
2014-01-22 10:45 ` Peter Zijlstra
2014-01-22 11:59 ` Peter Zijlstra
2014-01-23 1:53 ` Dave Young
2014-01-23 16:46 ` [tip:sched/urgent] sched/clock: Fixup early initialization tip-bot for Peter Zijlstra
2014-01-22 12:00 ` Markus Trippelsdorf [this message]
2014-01-22 12:07 ` [PATCH 13/15] sched: Use a static_key for sched_clock_stable Peter Zijlstra
2014-01-22 12:16 ` Peter Zijlstra
2014-01-22 12:26 ` Markus Trippelsdorf
2014-01-22 12:30 ` Peter Zijlstra
2014-01-22 13:14 ` Markus Trippelsdorf
2014-01-22 14:26 ` Sasha Levin
2014-01-22 18:35 ` Markus Trippelsdorf
2014-01-22 18:42 ` Peter Zijlstra
2014-01-22 18:45 ` Markus Trippelsdorf
2014-01-22 19:17 ` Josh Boyer
2014-01-22 19:09 ` Markus Trippelsdorf
2014-01-22 19:12 ` Markus Trippelsdorf
2014-01-22 20:16 ` Peter Zijlstra
2014-01-22 21:08 ` Peter Zijlstra
2014-01-22 21:17 ` Markus Trippelsdorf
2014-01-23 9:48 ` Peter Zijlstra
2014-01-23 10:01 ` Markus Trippelsdorf
2014-01-23 10:04 ` Peter Zijlstra
2014-01-23 13:32 ` Josh Boyer
2014-01-23 16:46 ` [tip:sched/urgent] sched/x86/tsc: Initialize multiplier to 0 tip-bot for Peter Zijlstra
2014-01-22 23:53 ` [PATCH 13/15] sched: Use a static_key for sched_clock_stable Josh Boyer
2014-01-23 1:53 ` Dave Young
2014-01-23 2:10 ` Dave Young
2014-01-23 16:56 ` Peter Zijlstra
2014-01-24 3:15 ` Dave Young
2014-01-24 7:58 ` Ingo Molnar
2014-01-22 17:14 ` Peter Zijlstra
2014-01-22 22:31 ` Sasha Levin
2013-12-12 14:08 ` [PATCH 14/15] sched, clock: Fixup clear_sched_clock_stable() Peter Zijlstra
2013-12-12 14:08 ` [PATCH 15/15] x86: Avoid a runtime condition in native_sched_clock() Peter Zijlstra
2013-12-13 3:30 ` [PATCH 00/15] cleanups and optimizations Mike Galbraith
2013-12-13 10:49 ` Eliezer Tamir
2013-12-13 13:56 ` Peter Zijlstra
2013-12-16 17:48 ` Eliezer Tamir
2013-12-17 13:32 ` Peter Zijlstra
2013-12-17 14:03 ` Eliezer Tamir
2013-12-17 15:13 ` Peter Zijlstra
2013-12-17 18:19 ` Eliezer Tamir
2013-12-17 22:11 ` Thomas Gleixner
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