I think I have found what's wrong. After 'make distclean' then 'make',
the problem of segfault has gone. There were some object files
compiled on another machine. The recompilation fixed it. But looks like
the ATBU call dosen't work on power7 system.
On Wed, Jul 24, 2013 at 10:10:19AM +0800, Han Pingtian wrote:
> On Tue, Jul 23, 2013 at 09:15:40AM -0600, Jens Axboe wrote:
> > On 07/23/2013 04:23 AM, Erwan Velu wrote:
> > > On 23/07/2013 12:13, Han Pingtian wrote:
> > >> Hey there,
> > >>
> > >> When trying to run fio on one of our power system, segmentation fault
> > >>
> > > Can you give us the kind of cpu you are using ? (/proc/cpuinfo)
> > > I'm not used with PPC but maybe your processor doesn't support ATBU call
> > > on mfspr.
> >
> > That is definitely the problem, so CPU info would help. In the mean
> > time, you can use clocksource=clock_gettime to get rid of the illegal
> > instruction.
>
> This is the contents of /proc/cpuinfo:
>
> processor : 0
> cpu : POWER7 (architected), altivec supported
> clock : 3550.000000MHz
> revision : 2.3 (pvr 003f 0203)
>
> processor : 1
> cpu : POWER7 (architected), altivec supported
> clock : 3550.000000MHz
> revision : 2.3 (pvr 003f 0203)
>
> processor : 2
> cpu : POWER7 (architected), altivec supported
> clock : 3550.000000MHz
> revision : 2.3 (pvr 003f 0203)
>
> processor : 3
> cpu : POWER7 (architected), altivec supported
> clock : 3550.000000MHz
> revision : 2.3 (pvr 003f 0203)
>
> timebase : 512000000
> platform : pSeries
> model : IBM,8231-E2C
> machine : CHRP IBM,8231-E2C
>
> But 'clocksource=clock_gettime' doesn't fix the fault. I can also get
> the same two cores.
>
> If I changed the code like this:
>
> ================================================================================
> diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
> index 65e6b74..30c315c 100644
> --- a/arch/arch-ppc.h
> +++ b/arch/arch-ppc.h
> @@ -67,15 +67,15 @@ static inline unsigned long long get_cpu_clock(void)
> unsigned long long ret;
>
> do {
> - if (arch_flags & ARCH_FLAG_1) {
> - tbu0 = mfspr(SPRN_ATBU);
> - tbl = mfspr(SPRN_ATBL);
> - tbu1 = mfspr(SPRN_ATBU);
> - } else {
> + //if (arch_flags & ARCH_FLAG_1) {
> + // tbu0 = mfspr(SPRN_ATBU);
> + // tbl = mfspr(SPRN_ATBL);
> + // tbu1 = mfspr(SPRN_ATBU);
> + //} else {
> tbu0 = mfspr(SPRN_TBRU);
> tbl = mfspr(SPRN_TBRL);
> tbu1 = mfspr(SPRN_TBRU);
> - }
> + //}
> } while (tbu0 != tbu1);
>
> ret = (((unsigned long long)tbu0) << 32) | tbl;
> ================================================================================
>
> then only one core dumpped which has this backtrace:
>
> ================================================================================
> Core was generated by `./fio/fio --debug=parse fio-jobs/randomw.fio '.
> Program terminated with signal 11, Segmentation fault.
> #0 0x000000001006288c in init_disk_util (td=0xfff9a730000) at diskutil.c:481
> 481 if (!td->o.do_disk_util ||
> (gdb) bt
> #0 0x000000001006288c in init_disk_util (td=0xfff9a730000) at diskutil.c:481
> #1 0x0000000010050d30 in run_threads () at backend.c:1691
> #2 0x000000001005159c in fio_backend () at backend.c:1911
> #3 0x00000000100669a4 in main (argc=<value optimized out>, argv=0xfffd20c9ec8, envp=<value optimized out>)
> at fio.c:50
> (gdb) p td
> $1 = (struct thread_data *) 0xfff9a730000
> (gdb) p threads
> $2 = (struct thread_data *) 0xfff9a730000
> (gdb) p td->io_ops
> $3 = (struct ioengine_ops *) 0x0
> (gdb) p threads->io_ops
> $4 = (struct ioengine_ops *) 0x1000e262720
> (gdb)
> ================================================================================
>
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