Re: [perfmon2] panic on mips when using sampling

[Stephane E. <er...@hp...>]

Vince,

On Thu, Nov 29, 2007 at 05:12:50PM -0500, Vince Weaver wrote:
> 
> I'm not sure if this is a perfmon problem, or a MIPS problem.  I'll try
> here first.
> 
> Normal performance counting on the r12k works fine.
> However, if I try to do sampled counting the kenrel panics.  I have the
> panic below.
> 
> The command I am running is something like the following:
> 
>    pfmon --short-smpl-period=100000000
> 	--long-smpl-period=100000000 --smpl-module=compact
>         --reset-non-smpl-periods --with-header
> 	-e cycles,icache_misses -- someprogram
> 
> It looks like the problem is when doing a cache flush.  If I disable the
> cache flush option, things get slightly further but then the machine locks
> up hard with no log messages...
> 
I am not a MIPS expert but I remember putting something else in there coming
from PHil about alignment constraints. Did you check the make menuconfig?

> 
> Vince
> 
> perfmon: sys_pfm_create_context.421: CPU0 [1030]: req=000000007fa665b8 fmt=0000000000000000 fmt_arg=0000000000000000 size=0
> perfmon: pfm_pmu_acquire.523: CPU0 [1030]: before pmu_acquired=0
> perfmon: pfm_pmu_acquire.547: CPU0 [1030]: PMU acquired: 4 PMCs, 4 PMDs, 4 counters
> perfmon: pfm_alloc_fd.759: CPU0 [1030]: new inode ino=3979 @a80000009ea112e8
> perfmon: pfm_find_set.589: CPU0 [1030]: looking for set=0
> perfmon: pfm_init_evtset.562: CPU0 [1030]: set0 pmc0=0x10
> perfmon: pfm_init_evtset.562: CPU0 [1030]: set0 pmc1=0x10
> perfmon: pfm_init_evtset.562: CPU0 [1030]: set0 pmc2=0x10
> perfmon: pfm_init_evtset.562: CPU0 [1030]: set0 pmc3=0x10
> perfmon: __pfm_create_context.1650: CPU0 [1030]: ctx=a80000009da32000 flags=0x0 system=0 notify_block=0 no_msg=0 use_fmt=0 ctx_fd=3 mode=0
> CPU 0 Unable to handle kernel paging request at virtual address c00000000006b000, epc == a800000020021880, ra == a80000002027fd7c
> Oops[#1]:
> Cpu 0
> $ 0   : 0000000000000000 0000000020640000 0000000000000000 c00000000006c000
> $ 4   : c00000000006b000 0000000000000000 0000000000000001 0000000000000001
> $ 8   : 0000000000000044 000000000003aed2 0000000000000000 a80000002059f280
> $12   : 0000000000000000 a80000002029c44c 0000000000000000 a8000000204d6f80
> $16   : c00000000006c000 c000000000063000 c00000000006b000 0000000000008000
> $20   : a80000009da32000 0000000000000000 a80000009dd28fc0 0000000000000000
> $24   : 0000000000000000 a800000020021878
> $28   : a80000009ecd4000 a80000009ecd7d40 0000000000000007 a80000002027fd7c
> Hi    : 00000000001d9790
> Lo    : 000000000009dd30
> epc   : a800000020021880 r4k_blast_dcache_page_dc32+0x8/0xa0     Not tainted
> ra    : a80000002027fd7c pfm_smpl_buffer_alloc+0x144/0x3c0
> Status: 9004fce3    KX SX UX KERNEL EXL IE
> Cause : 00000008
> BadVA : c00000000006b000
> PrId  : 00000e23
> Modules linked in:
> Process pfmon (pid: 1030, threadinfo=a80000009ecd4000, task=a80000009d5a4148)
> Stack : ffffffffffffffea a80000009da32000 a80000009da322a0 0000000000000000
>         a8000000205b62b0 a800000020282ce0 a8000000205b62b0 00000000004ed640
>         ffffffffffffffea 0000000000000000 a80000009ecd7e60 a80000009ecd7e68
>         a80000009d649d80 0000000000007fe8 a80000009ecd7e70 a80000002028a1ac
>         0000000000000000 0000000000437ae0 a80000009ecd7e20 00000000004ed640
>         0000000000000040 000000007fa66334 0000000000000000 00000000004eeb54
>         00000000004eeb58 a80000002028a440 0000000000000001 a8000000205ef160
>         0000000000000000 0000000000000000 0000000000000000 0000000000000000
>         0000000000000000 0000000000000000 0000000000000000 0000000000000000
>         a80000009dd28fc0 a8000000205b62b0 0000000000000000 0000000000000000
>         ...
> Call Trace:
> [<a800000020021880>] r4k_blast_dcache_page_dc32+0x8/0xa0
> [<a80000002027fd7c>] pfm_smpl_buffer_alloc+0x144/0x3c0
> [<a800000020282ce0>] __pfm_create_context+0x338/0x720
> [<a80000002028a440>] sys_pfm_create_context+0xe0/0x188
> [<a80000002001cd34>] handle_sys+0x134/0x150
> 
> 
> Code: 00000000  64831000  00000000 <bc950000> bc950020  bc950040  bc950060  bc950080  bc9500a0
> 
> 
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-- 

-Stephane