linux-stable.git/tools/perf/arch, branch v4.2.3

perf tools: Add ARM64 perf_regs_load to support libunwind and enable testing

2015-05-29T15:43:40+00:00

Newest libunwind does support ARM64, and perf is able to utilize it
also.

This patch enables the perf test dwarf unwind for arm64.

 Test result:
  # ./perf test unwind
  25: Test dwarf unwind                                      : Ok

Signed-off-by: Wang Nan 
Acked-by: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Zefan Li 
Link: http://lkml.kernel.org/r/1427461681-72971-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Assign default value for some pointers

2015-05-27T15:21:45+00:00

Assign default value for pointers that are identified by the compiler as
non-initialized.

Signed-off-by: Martin Liska 
Acked-by: Ingo Molnar 
Link: http://lkml.kernel.org/r/5564393C.1090104@suse.cz
Signed-off-by: Arnaldo Carvalho de Melo

perf probe ppc64le: Fixup function entry if using kallsyms lookup

2015-05-04T15:43:47+00:00

On powerpc ABIv2, if no debug-info is found and we use kallsyms, we need
to fixup the function entry to point to the local entry point. Use
offset of 8 since current toolchains always generate 2 instructions (8
bytes).

Signed-off-by: Naveen N. Rao 
Reviewed-by: Srikar Dronamraju 
Cc: Ananth N Mavinakayanahalli 
Cc: Masami Hiramatsu 
Cc: Michael Ellerman 
Cc: Sukadev Bhattiprolu 
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/92253021e77a104b23b615c8c23bf9501dfe60bf.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf probe ppc64le: Prefer symbol table lookup over DWARF

2015-05-04T15:43:46+00:00

Use symbol table lookups by default if DWARF is not necessary, since
powerpc ABIv2 encodes local entry points in the symbol table and the
function entry address in DWARF may not be appropriate for kprobes, as
described here:

https://sourceware.org/bugzilla/show_bug.cgi?id=17638

"The DWARF address ranges deliberately include the *whole* function,
both global and local entry points."
...
"If you want to set probes on a local entry point, you should look up
the symbol in the main symbol table (not DWARF), and check the st_other
bits; they will indicate whether the function has a local entry point,
and what its offset from the global entry point is.  Note that GDB does
the same when setting a breakpoint on a function entry."

Signed-off-by: Naveen N. Rao 
Reviewed-by: Srikar Dronamraju 
Cc: Ananth N Mavinakayanahalli 
Cc: Masami Hiramatsu 
Cc: Michael Ellerman 
Cc: Sukadev Bhattiprolu 
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/88a10e22f4aaba2aef812824ca4b10d7beeea012.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf probe ppc64le: Fix ppc64 ABIv2 symbol decoding

2015-05-04T15:43:45+00:00

ppc64 ELF ABIv2 has a Global Entry Point (GEP) and a Local Entry Point
(LEP). For purposes of probing, we need the LEP - the offset to which is
encoded in st_other.

Signed-off-by: Ananth N Mavinakayanahalli 
Reviewed-by: Srikar Dronamraju 
Cc: Masami Hiramatsu 
Cc: Michael Ellerman 
Cc: Sukadev Bhattiprolu 
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/ab9cc5e2b9de4cbaaf50f6ef2346a6a81100bad1.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Naveen N. Rao 
Signed-off-by: Arnaldo Carvalho de Melo

perf probe ppc: Enable matching against dot symbols automatically

2015-05-04T15:43:44+00:00

Allow perf probe to work on ppc ABIv1 without the need to specify the
leading dot '.' for functions. 'perf probe do_fork' works with this
patch.

We do this by changing how symbol name comparison works on ppc ABIv1 -
we simply ignore and skip over the initial dot, if one exists, during
symbol name comparison.

Signed-off-by: Naveen N. Rao 
Reviewed-by: Srikar Dronamraju 
Cc: Ananth N Mavinakayanahalli 
Cc: Masami Hiramatsu 
Cc: Michael Ellerman 
Cc: Sukadev Bhattiprolu 
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/652a8f3bfa919bd02a1836a128370eaed59b4a34.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf probe ppc: Use the right prefix when ignoring SyS symbols on ppc

2015-05-04T15:43:43+00:00

Use the proper prefix when ignoring SyS symbols on ppc ABIv1. While at
it, generalize symbol selection so architectures can implement their own
logic.

Signed-off-by: Naveen N. Rao 
Reviewed-by: Srikar Dronamraju 
Cc: Ananth N Mavinakayanahalli 
Cc: Masami Hiramatsu 
Cc: Michael Ellerman 
Cc: Sukadev Bhattiprolu 
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/adf1f98b121ecaf292777fe5cc69fe1038feabce.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf probe ppc: Fix symbol fixup issues due to ELF type

2015-05-04T15:43:42+00:00

If using the symbol table, symbol addresses are not being fixed up
properly, resulting in probes being placed at wrong addresses:

  # perf probe do_fork
  Added new event:
    probe:do_fork        (on do_fork)

  You can now use it in all perf tools, such as:

	  perf record -e probe:do_fork -aR sleep 1

  # cat /sys/kernel/debug/tracing/kprobe_events
  p:probe/do_fork _text+635952
  # printf "%x" 635952
  9b430
  # grep do_fork /boot/System.map
  c0000000000ab430 T .do_fork

Fix by checking for ELF type ET_DYN used by ppc64 kernels.

Signed-off-by: Naveen N. Rao 
Reviewed-by: Srikar Dronamraju 
Cc: Ananth N Mavinakayanahalli 
Cc: Masami Hiramatsu 
Cc: Michael Ellerman 
Cc: Sukadev Bhattiprolu 
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/41392bb856ef62d929995e0b61967689b7915207.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf build: Add arch sparc objects building

2015-02-12T16:22:01+00:00

Move the sparc arch objects building under build framework to be
included in the libperf build object.

Signed-off-by: Jiri Olsa 
Tested-by: Sukadev Bhattiprolu 
Tested-by: Will Deacon 
Cc: Alexis Berlemont 
Cc: Borislav Petkov 
Cc: Corey Ashford 
Cc: David Ahern 
Cc: Frederic Weisbecker 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Link: http://lkml.kernel.org/n/tip-160hknrqr27c9zf59japw91y@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf build: Add arch sh objects building

2015-02-12T16:21:31+00:00

Move the sh arch objects building under build framework to be included
in the libperf build object.

Signed-off-by: Jiri Olsa 
Tested-by: Sukadev Bhattiprolu 
Tested-by: Will Deacon 
Cc: Alexis Berlemont 
Cc: Borislav Petkov 
Cc: Corey Ashford 
Cc: David Ahern 
Cc: Frederic Weisbecker 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Link: http://lkml.kernel.org/n/tip-nsg1j4djtq85jtrqw830f2az@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo