linux-kernel - Re: [PATCH V11 0/4]perf/powerpc: Add ability to sample intr machine state in powerpc

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Message-ID: <56DD3A72.2080209@linux.vnet.ibm.com>
Date:	Mon, 7 Mar 2016 13:53:14 +0530
From:	Anju T <anju@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mpe@...erman.id.au, maddy@...ux.vnet.ibm.com, jolsa@...hat.com,
	dsahern@...il.com, acme@...hat.com, sukadev@...ux.vnet.ibm.com,
	hemant@...ux.vnet.ibm.com, naveen.n.rao@...ux.vnet.ibm.com,
	linuxppc-dev@...ts.ozlabs.org, anju@...ux.vnet.ibm.com
Subject: Re: [PATCH V11 0/4]perf/powerpc: Add ability to sample intr machine
 state in powerpc

Hi,

Any updates on this?

On Saturday 20 February 2016 10:32 AM, Anju T 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?       # list supported registers
>
> output:
> available registers: r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15 r16 r17 r18 r19 r20 r21 r22 r23 r24 r25 r26 r27 r28 r29 r30 r31 nip msr orig_r3 ctr link xer ccr softe trap dar dsisr
>
>   usage: perf record [<options>] [<command>]
>      or: perf record [<options>] -- <command> [<options>]
>
>      -I, --intr-regs[=<any register>]
>                            sample selected machine registers on interrupt, use -I ? to list register names
>
>
> $ perf record -I ls   # record machine state at interrupt
> $ perf script -D      # read the perf.data file
>
> Sample output obtained for this patchset/ output looks like as follows:
>
> 496768515470 0x1988 [0x188]: PERF_RECORD_SAMPLE(IP, 0x1): 4522/4522: 0xc0000000001e538c period: 1 addr: 0
> ... intr regs: mask 0x7ffffffffff ABI 64-bit
> .... r0    0xc0000000001e5e34
> .... r1    0xc000000fe733f9a0
> .... r2    0xc000000001523100
> .... r3    0xc000000ffaadeb60
> .... r4    0xc000000003456800
> .... r5    0x73a9b5e000
> .... r6    0x1e000000
> .... r7    0x0
> .... r8    0x0
> .... r9    0x0
> .... r10   0x1
> .... r11   0x0
> .... r12   0x24022822
> .... r13   0xc00000000feec180
> .... r14   0x0
> .... r15   0xc000001e4be18800
> .... r16   0x0
> .... r17   0xc000000ffaac5000
> .... r18   0xc000000fe733f8a0
> .... r19   0xc000000001523100
> .... r20   0xc00000000009fd1c
> .... r21   0xc000000fcaa69000
> .... r22   0xc0000000001e4968
> .... r23   0xc000000001523100
> .... r24   0xc000000fe733f850
> .... r25   0xc000000fcaa69000
> .... r26   0xc000000003b8fcf0
> .... r27   0xfffffffffffffead
> .... r28   0x0
> .... r29   0xc000000fcaa69000
> .... r30   0x1
> .... r31   0x0
> .... nip   0xc0000000001dd320
> .... msr   0x9000000000009032
> .... orig_r3 0xc0000000001e538c
> .... ctr   0xc00000000009d550
> .... link  0xc0000000001e5e34
> .... xer   0x0
> .... ccr   0x84022882
> .... softe 0x0
> .... trap  0xf01
> .... dar   0x0
> .... dsisr 0xf00040060000004
>   ... thread: :4522:4522
>   ...... dso: /root/.debug/.build-id/b0/ef11b1a1629e62ac9de75199117ee5ef9469e9
>             :4522  4522   496.768515:          1 cycles:  c0000000001e538c .perf_event_context_sched_in (/boot/vmlinux)
>
>
>
> Changes from v10:
>
> - Included SOFTE as suggested by mpe
> - The name of registers displayed is  changed from
>    gpr* to r* also the macro names changed from
>    PERF_REG_POWERPC_GPR* to PERF_REG_POWERPC_R*.
> - The conflict in returning the ABI is resolved.
> - #define PERF_REG_SP  is again changed to  PERF_REG_POWERPC_R1
> - Comment in tools/perf/config/Makefile is updated.
> - removed the "Reviewed-By" tag as the patch has logic changes.
>
>
> Changes from V9:
>
> - Changed the name displayed for link register from "lnk" to "link" in
>    tools/perf/arch/powerpc/include/perf_regs.h
>
> changes from V8:
>
> - Corrected the indentation issue in the Makefile mentioned in 3rd patch
>
> Changes from V7:
>
> - Addressed the new line issue in 3rd patch.
>
> Changes from V6:
>
> - Corrected the typo in patch  tools/perf: Map the ID values with register names.
>    ie #define PERF_REG_SP  PERF_REG_POWERPC_R1 should be #define PERF_REG_SP   PERF_REG_POWERPC_GPR1
>
>
> Changes from V5:
>
> - Enabled perf_sample_regs_user also in this patch set.Functions added in
>     arch/powerpc/perf/perf_regs.c
> - Added Maddy's patch to this patchset for enabling -I? option which will
>    list the supported register names.
>
>
> Changes from V4:
>
> - Removed the softe and MQ from all patches
> - Switch case is replaced with an array in the 3rd patch
>
> Changes from V3:
>
> - Addressed the comments by Sukadev regarding the nits in the descriptions.
> - Modified the subject of first patch.
> - Included the sample output in the 3rd patch also.
>
> 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.
>
> Changes from V1:
>
> - Solved the name missmatch issue in the from and signed-off field of the patch series.
> - Added necessary comments in the 3rd patch ie perf/powerpc ,as suggested by Maddy.
>
>
>
> Anju T (3):
>    perf/powerpc: assign an id to each powerpc register
>    perf/powerpc: add support for sampling intr machine state
>    tools/perf: Map the ID values with register names
>
> Madhavan Srinivasan (1):
>    tool/perf: Add sample_reg_mask to include all perf_regs regs
>
>
>   arch/powerpc/Kconfig                        |  1 +
>   arch/powerpc/include/uapi/asm/perf_regs.h   | 50 ++++++++++++++++
>   arch/powerpc/perf/Makefile                  |  1 +
>   arch/powerpc/perf/perf_regs.c               | 91 +++++++++++++++++++++++++++++
>   tools/perf/arch/powerpc/include/perf_regs.h | 69 ++++++++++++++++++++++
>   tools/perf/arch/powerpc/util/Build          |  1 +
>   tools/perf/arch/powerpc/util/perf_regs.c    | 49 ++++++++++++++++
>   tools/perf/config/Makefile                  |  5 ++
>   8 files changed, 267 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
>   create mode 100644 tools/perf/arch/powerpc/util/perf_regs.c
>
Thanks
Anju