Messages in this thread | | | Subject | Re: Hard lockup with timer events | From | Peter Zijlstra <> | Date | Wed, 11 Nov 2009 14:23:01 +0100 |
| |
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' ;-)
| |