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3 Commits

Author SHA1 Message Date
Ravi Bangoria
d18019a53a perf tests: Add dwarf unwind test for powerpc 
The user stack dump feature was recently added for powerpc. But there
was no test case available to test it.

This test works same as on other architectures by preparing a stack
frame on the perf test thread and comparing each frame by unwinding it.

  $ ./perf test 50
    50: Test dwarf unwind    : Ok

User stack dump for powerpc: https://lkml.org/lkml/2016/4/28/482

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1474267100-31079-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 2016-09-29 11:18:21 -03:00
Masami Hiramatsu
293d5b4394 perf probe: Support probing on offline cross-arch binary 
Support probing on offline cross-architecture binary by adding getting
the target machine arch from ELF and choose correct register string for
the machine.

Here is an example:
  -----
  $ perf probe --vmlinux=./vmlinux-arm --definition 'do_sys_open $params'
  p:probe/do_sys_open do_sys_open+0 dfd=%r5:s32 filename=%r1:u32 flags=%r6:s32 mode=%r3:u16
  -----

Here, we can get probe/do_sys_open from above and append it to to the target
machine's tracing/kprobe_events file in the tracefs mountput, usually
/sys/kernel/debug/tracing/kprobe_events (or /sys/kernel/tracing/kprobe_events).

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/147214229717.23638.6440579792548044658.stgit@devbox
[ Add definition for EM_AARCH64 to fix the build on at least centos 6, debian 7 & ubuntu 12.04.5 ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 2016-09-01 12:41:09 -03:00
Anju T
dc642e8388 tools/perf: Map the ID values with register names 
Map ID values with corresponding register names. These names are then
displayed when user issues perf record with the -I option
followed by perf report/script with -D option.

To test this patchset, Eg:

  $ perf record -I ls   # record machine state at interrupt
  $ perf script -D      # read the perf.data file

Sample output obtained for this patch / 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)

Signed-off-by: Anju T <anju@linux.vnet.ibm.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
 2016-04-21 23:33:00 +10:00