linux-kernel - Re: [PATCH] mm: fix up a spurious page fault whenever it happens

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Message-ID: <519F24DD.5060700@meduna.org>
Date:	Fri, 24 May 2013 10:29:17 +0200
From:	Stanislav Meduna <stano@...una.org>
To:	Rik van Riel <riel@...hat.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Hai Huang <hhuang@...hat.com>
Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens

On 23.05.2013 14:19, Rik van Riel wrote:

>>> static inline void __native_flush_tlb_single(unsigned long addr)
>>> {
>>>          __flush_tlb();
>>> }
> 
>> I will give it some more testing time.
> 
> That is a good idea.

Still no crash, so this one indeed seems to change things.

If I understand it correctly, these patches fix the problem
when it happens and we still don't know why the TLB is stale
in the first place - whether there is (also) a genuine bug
or whether we are hitting some chip errata, right?


For the record the cpuinfo for my present testsystem:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 5
model           : 10
model name      : Geode(TM) Integrated Processor by AMD PCS
stepping        : 2
microcode       : 0x88a93d
cpu MHz         : 498.042
cache size      : 128 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu de pse tsc msr cx8 sep pge cmov clflush mmx
                  mmxext 3dnowext 3dnow
bogomips        : 996.08
clflush size    : 32
cache_alignment : 32
address sizes   : 32 bits physical, 32 bits virtual
power management:

and for the Celeron M where I can unfortunately reproduce
it much less often (days to weeks).

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 13
model name      : Intel(R) Celeron(R) M processor         1.00GHz
stepping        : 8
cpu MHz         : 1000.011
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
                  mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm
                  pbe nx bts
bogomips        : 2000.02
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:


Thanks
-- 
                                           Stano

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