Re: [x86/tlb] ff9b625d26: stderr.Run:"Process_Creation":Fork_failed_at_iteration in unixbench test

[Alex Shi <alex.shi@linaro.org>]

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Hi Xiaolong,

I tried this benchmark on my native haswell box, but it works. and get
unstable/better performance value.
This patch may be has some problem when it run in guest OS.
Did you run the case on a guest OS or a native OS?

Any other benchmark did you test on any other machine? If so, what's the
result you get?

Regards
Alex

On 03/17/2016 02:00 PM, kernel test robot wrote:
> FYI, we noticed stderr.Run:"Process_Creation":Fork_failed_at_iteration in unixbench test on
> 
> https://github.com/alexshi/power-scheduling.git x86-tlb
> commit ff9b625d26ba7750745d235dc6f1792fb36fea48 ("x86/tlb: just do tlb flush on one of siblings of SMT")
> 
> 2016-03-17 06:04:39 ./Run spawn -c 1
> 
>    #    #  #    #  #  #    #          #####   ######  #    #   ####   #    #
>    #    #  ##   #  #   #  #           #    #  #       ##   #  #    #  #    #
>    #    #  # #  #  #    ##            #####   #####   # #  #  #       ######
>    #    #  #  # #  #    ##            #    #  #       #  # #  #       #    #
>    #    #  #   ##  #   #  #           #    #  #       #   ##  #    #  #    #
>     ####   #    #  #  #    #          #####   ######  #    #   ####   #    #
> 
>    Version 5.1.3                      Based on the Byte Magazine Unix Benchmark
> 
>    Multi-CPU version                  Version 5 revisions by Ian Smith,
>                                       Sunnyvale, CA, USA
>    January 13, 2011                   johantheghost at yahoo period com
> 
> 
> 1 x Process Creation  1
> 
> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/nr_task/rootfs/tbox_group/test/testcase:
>   gcc-4.9/performance/x86_64-rhel/1/debian-x86_64-2015-02-07.cgz/lkp-ivb-d02/spawn/unixbench
> 
> commit: 
>   v4.5
>   ff9b625d26ba7750745d235dc6f1792fb36fea48
> 
>             v4.5 ff9b625d26ba7750745d235dc6 
> ---------------- -------------------------- 
>        fail:runs  %reproduction    fail:runs
>            |             |             |    
>            :4          100%           4:4     last_state.failed
>            :4          100%           4:4     last_state.is_incomplete_run
>            :4          100%           4:4     last_state.unixbench.exit_code.1
>            :4          100%           4:4     stderr.**********************************************
>            :4           50%           2:4     stderr.Reason:Success;aborting
>            :4          100%           4:4     stderr.Run:"Process_Creation":Fork_failed_at_iteration
>            :4           50%           2:4     stderr.Segmentation_fault;aborting
> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/nr_task/rootfs/tbox_group/test/testcase:
>   gcc-4.9/performance/x86_64-rhel/1/debian-x86_64-2015-02-07.cgz/lkp-ivb-d04/spawn/unixbench
> 
> commit: 
>   v4.5
>   ff9b625d26ba7750745d235dc6f1792fb36fea48
> 
>             v4.5 ff9b625d26ba7750745d235dc6 
> ---------------- -------------------------- 
>        fail:runs  %reproduction    fail:runs
>            |             |             |    
>            :8          100%           8:8     last_state.failed
>            :8          100%           8:8     last_state.is_incomplete_run
>            :8          100%           8:8     last_state.unixbench.exit_code.1
>            :8          100%           8:8     stderr.**********************************************
>            :8           12%           1:8     stderr.Aborted;aborting
>            :8           62%           5:8     stderr.Reason:Success;aborting
>            :8           75%           6:8     stderr.Run:"Process_Creation":Fork_failed_at_iteration
>            :8           12%           1:8     stderr.Run:"Process_Creation":Segmentation_fault;aborting
>            :8           12%           1:8     stderr.Run:"Process_Creation":spawn:../nptl/sysdeps/unix/sysv/linux/x86_64/../fork.c:#:__libc_fork:Assertion`({__typeof(({struct_pthread*__self;asm("mov%%fs:%c1,%#":"=r"(__self):"i"(__builtin_offsetof(struct_pthread,header.self)));__self;})->tid)__value;if(sizeof(__value)==#)asm_volatile("movb%%fs:%P2,%b0":"=q"(__value):"#"(#),"i"(__builtin_offsetof(struct_pthread,tid)));else_if(sizeof(__value)==#)asm_volatile("movl%%fs:%P1,%#":"=r"(__value):"i"(__builtin_offsetof(struct_pthread,tid)));else{if(sizeof(__value)!=#)abort();asm_volatile("movq%%fs:%P1,%q0":"=r"(__value):"i"(__builtin_offsetof(struct_pthread,tid)));}__value;})==ppid'failed
>            :8           12%           1:8     stderr.Segmentation_fault;aborting
> 
> lkp-ivb-d02: Ivy Bridge
> Memory: 8G
> 
> lkp-ivb-d04: Ivy Bridge
> Memory: 4G
> 
> 
> To reproduce:
> 
>         git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
>         cd lkp-tests
>         bin/lkp install job.yaml  # job file is attached in this email
>         bin/lkp run     job.yaml
> 
> 
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
> 
> 
> Thanks,
> Xiaolong Ye
>