Messages in this thread | | | Date | Wed, 11 Nov 2009 17:34:23 +0100 | From | Frederic Weisbecker <> | Subject | Re: Hard lockup with timer events |
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On Wed, Nov 11, 2009 at 02:23:01PM +0100, Peter Zijlstra wrote: > On Wed, 2009-11-11 at 05:50 +0100, Frederic Weisbecker wrote: > > On Thu, Oct 29, 2009 at 08:15:03PM +0100, Soeren Sandmann wrote: > > > Hi, > > > > > > This program > > > > > > http://www.daimi.au.dk/~sandmann/lockup.c > > > > > > locks up hard for me on a Pentium 4 in 32 bit mode, with the hrtimer > > > patches applied (-tip for example). > > > > > > What the program does is spawn a thread that just spins, and then 400 > > > threads that each create a performance counter of type > > > PERF_COUNT_SW_CPU_CLOCK and a sample period of 1000000 and a > > > sample_type of > > > > > > PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_CALLCHAIN > > > > > > These threads then map the event buffer and read it continuously. > > > > > > It does not apparently lock up if SAMPLE_CALLCHAIN is removed; also I > > > cannot get it to lock up on Core 2 Duo in either 32 or 64 bit mode. > > > > > > > > > Soren > > > > > > > > It locks up hard for me too, no more blinking cursor, nothing. > > I've attached my config, it's against tip:master from yesterday. > > What kind of cpu does your laptop have? The .config seems to suggest a > Core2. Which would make Soeren's report of not being able to trash a > 64bit core2 'interesting' ;-)
Nop it's a Pentium Dual Core :)
processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Pentium(R) Dual CPU T2310 @ 1.46GHz stepping : 13 cpu MHz : 800.000 cache size : 1024 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 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 syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm bogomips : 2925.95 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
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