Messages in this thread | | | Date | Wed, 16 Jul 2014 14:54:14 -0500 | From | Bruno Wolff III <> | Subject | Re: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c |
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On Wed, Jul 16, 2014 at 21:17:32 +0200, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote: >Hi Bruno and Josh, > >From the issue, I see that the machine making trouble is an Xeon (2 >processors w/ hyper-threading). > >Could you please share: > > cat /proc/cpuinfo and
I have attached it to the bug and to this message.
> cat /proc/schedstat (kernel config w/ CONFIG_SCHEDSTATS=y)
It looks like that isn't set for my previous builds and I'll need to set it for my next test build.
>Could you also put the two BUG_ON lines into build_sched_groups() >[kernel/sched/core.c] wo/ the cpumask_clear() and setting >sg->sgc->capacity to 0 and share the possible crash output as well?
I can try a new build with this. I can probably get results back tomorrow before I leave for work. The crashes happen too early in the boot process for me to easily capture output as text. I can slow things down to take pictures though. processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Xeon(TM) CPU 2.66GHz stepping : 9 microcode : 0x2d cpu MHz : 2657.830 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fdiv_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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr bogomips : 5315.66 clflush size : 64 cache_alignment : 128 address sizes : 36 bits physical, 32 bits virtual power management:
processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Xeon(TM) CPU 2.66GHz stepping : 9 microcode : 0x2d cpu MHz : 2657.830 cache size : 512 KB physical id : 3 siblings : 2 core id : 0 cpu cores : 1 apicid : 6 initial apicid : 6 fdiv_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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr bogomips : 5314.67 clflush size : 64 cache_alignment : 128 address sizes : 36 bits physical, 32 bits virtual power management:
processor : 2 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Xeon(TM) CPU 2.66GHz stepping : 9 microcode : 0x2d cpu MHz : 2657.830 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 apicid : 1 initial apicid : 1 fdiv_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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr bogomips : 5314.68 clflush size : 64 cache_alignment : 128 address sizes : 36 bits physical, 32 bits virtual power management:
processor : 3 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Xeon(TM) CPU 2.66GHz stepping : 9 microcode : 0x2d cpu MHz : 2657.830 cache size : 512 KB physical id : 3 siblings : 2 core id : 0 cpu cores : 1 apicid : 7 initial apicid : 7 fdiv_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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr bogomips : 5314.68 clflush size : 64 cache_alignment : 128 address sizes : 36 bits physical, 32 bits virtual power management:
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