[PATCH V3 0/3] perf/powerpc:Add ability to sample intr machine state in powerpc

Wed Nov 4 19:56:21 AEDT 2015

On 11/3/15, Anju T <anju at linux.vnet.ibm.com> wrote:
> This short patch series adds the ability to sample the interrupted
> machine state for each hardware sample.
>
> To test this patchset,
> Eg:
>
> $perf record -I ls   // record machine state at interrupt
> $perf script -D      //read the perf.data file

Uncovered the following warning with the series applied. Looks like
that it's not
directly related to your patches but anyway...

[  507.655197] DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)
[  507.655220] ------------[ cut here ]------------
[  507.655226] WARNING: at kernel/locking/lockdep.c:3523
[  507.655230] Modules linked in: ipv6 binfmt_misc ehea
[  507.655242] CPU: 12 PID: 3746 Comm: ls Tainted: G S
4.3.0-rc3-00103-g3b0e21e-dirty #11
[  507.655249] task: c0000005b607b290 ti: c0000005b62e8000 task.ti:
c0000005b62e8000
[  507.655255] NIP: c00000000010c944 LR: c00000000010c940 CTR: c000000000659380
[  507.655261] REGS: c0000005b62eb5c0 TRAP: 0700   Tainted: G S
       (4.3.0-rc3-00103-g3b0e21e-dirty)
[  507.655266] MSR: 8000000000029032 <SF,EE,ME,IR,DR,RI>  CR: 22088422
 XER: 0000000e
[  507.655284] CFAR: c0000000008977c4 SOFTE: 0
GPR00: c00000000010c940 c0000005b62eb840 c00000000102e600 000000000000002f
GPR04: 0000000000000001 c0000000001208d8 0000000000000000 0000000000000001
GPR08: c000000000eee600 c0000005b607b290 0000000000000000 0000000000003fef
GPR12: 0000000042088428 c00000000e956600 00000000001fffff 00003fffd546c4b0
GPR16: 00000000001fffff 0000000000000013 c000000000b198a8 0000000000000000
GPR20: c0000005acbb2f80 c0000005b5c5dd00 00003fffd546c500 0000000000000001
GPR24: c00000000024af54 0000000000000000 0000000000000001 0000000000000001
GPR28: 0000000000000000 0000000000000000 c0000005acbb2ea0 c000000001e0cf78
[  507.655376] NIP [c00000000010c944] .check_flags.part.36+0xd4/0x240
[  507.655382] LR [c00000000010c940] .check_flags.part.36+0xd0/0x240
[  507.655387] Call Trace:
[  507.655391] [c0000005b62eb840] [c00000000010c940]
.check_flags.part.36+0xd0/0x240 (unreliable)
[  507.655400] [c0000005b62eb8c0] [c0000000001112b8] .lock_acquire+0x208/0x2a0
[  507.655407] [c0000005b62eb990] [c00000000024af80] .__might_fault+0xb0/0xf0
[  507.655415] [c0000005b62eba10] [c0000000004d5d38] .strnlen_user+0x1d8/0x200
[  507.655422] [c0000005b62ebad0] [c00000000032fa0c]
.load_elf_binary+0x103c/0x1650
[  507.655430] [c0000005b62ebc10] [c0000000002bac54]
.search_binary_handler+0xc4/0x260
[  507.655437] [c0000005b62ebcb0] [c0000000002bcd54]
.do_execveat_common.isra.22+0x7d4/0xb40
[  507.655444] [c0000005b62ebda0] [c0000000002bd4a8] .SyS_execve+0x38/0x50
[  507.655451] [c0000005b62ebe30] [c00000000000916c] system_call+0x38/0xd0
[  507.655456] Instruction dump:
[  507.655461] 419e0034 3d4200e5 392a3280 81290000 2f890000 40fe0020
3c62ffad 3c82ffad
[  507.655475] 3863c038 38841f88 4878adfd 60000000 <0fe00000> 3c62ffad
38632010 4878ade9
[  507.655490] ---[ end trace 47284e8c92efaa7e ]---
[  507.655494] possible reason: unannotated irqs-on.
[  507.655498] irq event stamp: 2324
[  507.655501] hardirqs last  enabled at (2323): [<c00000000088ed24>]
._raw_spin_unlock_irqrestore+0x54/0xd0
[  507.655510] hardirqs last disabled at (2324): [<c000000000009924>]
restore_irq_off+0x24/0x28
[  507.655518] softirqs last  enabled at (2184): [<c00000000009cb90>]
.__do_softirq+0x500/0x670
[  507.655526] softirqs last disabled at (2169): [<c00000000009d198>]
.irq_exit+0xd8/0x120

>
> Sample output obtained for this patchset/ output looks like as follows:
>
> 331557004666 0x1988 [0x188]: PERF_RECORD_SAMPLE(IP, 0x1): 4807/4807:
> 0xc0000000001ddf60 period: 1 addr: 0
> ... intr regs: mask 0x7ffffffffff ABI 64-bit
> .... gpr0  0xc0000000001e6a74
> .... gpr1  0xc0000000ff33b9a0
> .... gpr2  0xc000000001523000
> .... gpr3  0xc000000ffa9deb60
> .... gpr4  0xc0000000ff971e00
> .... gpr5  0x4d32564532
> .... gpr6  0x1e000000
> .... gpr7  0x0
> .... gpr8  0x0
> .... gpr9  0x0
> .... gpr10 0x1
> .... gpr11 0x0
> .... gpr12 0x24022822
> .... gpr13 0xc00000000feeaf80
> .... gpr14 0x0
> .... gpr15 0xc0000000fbc21000
> .... gpr16 0x0
> .... gpr17 0xc000000ffa9c5000
> .... gpr18 0xc0000000ff33b8a0
> .... gpr19 0xc000000001523000
> .... gpr20 0xc0000000000a097c
> .... gpr21 0xc000000fcac65600
> .... gpr22 0xc0000000001e55a8
> .... gpr23 0xc000000001523000
> .... gpr24 0xc0000000ff33b850
> .... gpr25 0xc000000fcac65600
> .... gpr26 0xc000001e4b378210
> .... gpr27 0xfffffffffffffead
> .... gpr28 0x100000000
> .... gpr29 0xc000000fcac65600
> .... gpr30 0x1
> .... gpr31 0x0
> .... nip   0xc0000000001ddf68
> .... msr   0x9000000000009032
> .... orig_r3 0xc0000000001e5fcc
> .... ctr   0xc00000000009e1b0
> .... link  0xc0000000001e6a74
> .... xer   0x0
> .... ccr   0x84022882
> .... softe 0x0
> .... trap  0xf01
> .... dar   0x0
> .... dsisr 0xf00040060000004
>  ... thread: :4807:4807
>  ...... dso:
> /root/.debug/.build-id/1c/011201a1082e91b8449e6dd528f224d7a16535
>            :4807  4807   331.557004:          1 cycles:  c0000000001ddf60
> .perf_ctx_unlock (/boot/vmlinux)
>
> 0x1b10 [0x188]: event: 9
>
>
> Changes from V2:
>
> - tools/perf/config/Makefile is moved to the patch tools/perf.
> - The patchset is reordered.
> - perf_regs_load() function is used for the dwarf unwind test.Since it is
> not required here,
>   it is removed from tools/perf/arch/powerpc/include/perf_regs.h 	
> - PERF_REGS_POWERPC_RESULT is removed.
>
>
>
>
>
> Anju T (3):
>   perf/powerpc:add ability to sample intr machine state in power
>   perf/powerpc :add support for sampling intr machine state
>   tools/perf:Map the ID values with register names
>
>  arch/powerpc/Kconfig                        |   1 +
>  arch/powerpc/include/uapi/asm/perf_regs.h   |  54 +++++++++++++
>  arch/powerpc/perf/Makefile                  |   2 +
>  arch/powerpc/perf/perf_regs.c               |  92 ++++++++++++++++++++++
>  tools/perf/arch/powerpc/include/perf_regs.h | 114
> ++++++++++++++++++++++++++++
>  tools/perf/config/Makefile                  |   5 ++
>  6 files changed, 268 insertions(+)
>  create mode 100644 arch/powerpc/include/uapi/asm/perf_regs.h
>  create mode 100644 arch/powerpc/perf/perf_regs.c
>  create mode 100644 tools/perf/arch/powerpc/include/perf_regs.h
>
> --
> 2.1.0
>
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