kernel/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c, branch linux-4.15.y

Merge tag 'perf-core-for-mingo-4.12-20170316' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

2017-03-16T16:29:23Z

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: New features: - Add 'brstackinsn' field in 'perf script' to reuse the x86 instruction decoder used in the Intel PT code to study hot paths to samples (Andi Kleen) Kernel changes: - Default UPROBES_EVENTS to Y (Alexei Starovoitov) - Fix check for kretprobe offset within function entry (Naveen N. Rao) Infrastructure changes: - Introduce util func is_sdt_event() (Ravi Bangoria) - Make perf_event__synthesize_mmap_events() scale on older kernels where reading /proc/pid/maps is way slower than reading /proc/pid/task/pid/maps (Stephane Eranian) Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Ingo Molnar

perf script: Add 'brstackinsn' for branch stacks

2017-03-16T12:24:35Z

Implement printing instruction sequences as hex dump for branch stacks. This relies on the x86 instruction decoder used by the PT decoder to find the lengths of instructions to dump them individually. This is good enough for pattern matching. This allows to study hot paths for individual samples, together with branch misprediction and cycle count / IPC information if available (on Skylake systems). % perf record -b ... % perf script -F brstackinsn ... read_hpet+67: ffffffff9905b843 insn: 74 ea # PRED ffffffff9905b82f insn: 85 c9 ffffffff9905b831 insn: 74 12 ffffffff9905b833 insn: f3 90 ffffffff9905b835 insn: 48 8b 0f ffffffff9905b838 insn: 48 89 ca ffffffff9905b83b insn: 48 c1 ea 20 ffffffff9905b83f insn: 39 f2 ffffffff9905b841 insn: 89 d0 ffffffff9905b843 insn: 74 ea # PRED Only works when no special branch filters are specified. Occasionally the path does not reach up to the sample IP, as the LBRs may be frozen before executing a final jump. In this case we print a special message. The instruction dumper piggy backs on the existing infrastructure from the IP PT decoder. An earlier iteration of this patch relied on a disassembler, but this version only uses the existing instruction decoder. Committer note: Added hint about how to get suitable perf.data files for use with '-F brstackinsm': $ perf record usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.018 MB perf.data (8 samples) ] $ $ perf script -F brstackinsn Display of branch stack assembler requested, but non all-branch filter set Hint: run 'perf record -b ...' $ Signed-off-by: Andi Kleen Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Michael Ellerman Link: http://lkml.kernel.org/r/20170223234634.583-1-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo

Merge branch 'linus' into perf/core, to pick up fixes

2017-03-16T08:50:50Z

Signed-off-by: Ingo Molnar

perf intel-PT/BTS: Add missing initialization

2017-03-03T22:07:18Z

$ perf test decoder 57: x86 instruction decoder - new instructions : FAILED! $ Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 80 78 56 34 12 bndstx %bnd0,0x12345678(%rax) Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 85 78 56 34 12 bndstx %bnd0,0x12345678(%rbp) Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 01 78 56 34 12 bndstx %bnd0,0x12345678(%rcx,%rax,1) Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 05 78 56 34 12 bndstx %bnd0,0x12345678(%rbp,%rax,1) Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 08 78 56 34 12 bndstx %bnd0,0x12345678(%rax,%rcx,1) There is missing initialization. It only affects the test because it is checking 'rel' even in cases where there is no value. Fix it. Reported-and-Tested-by: Arnaldo Carvalho de Melo Signed-off-by: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lkml.kernel.org/r/08c6ad07-7994-3e56-b20e-d75727ca7765@intel.com Signed-off-by: Arnaldo Carvalho de Melo

x86/events: Remove last remnants of old filenames

2017-03-01T10:27:26Z

Update to the new file paths, remove them from introductory comments. Signed-off-by: Borislav Petkov Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20170218113140.8051-1-bp@alien8.de Signed-off-by: Thomas Gleixner

perf intel-pt/bts: Report instruction bytes and length in sample

2016-10-24T13:31:32Z

Change Intel PT and BTS to pass up the length and the instruction bytes of the decoded or sampled instruction in the perf sample. The decoder already knows this information, we just need to pass it up. Since it is only a couple of movs it is not very expensive. Handle instruction cache too. Make sure ilen is always initialized. Used in the next patch. [Adrian: re-base on top (and adjust for) instruction buffer size tidy-up] [Adrian: add BTS support and adjust commit message accordingly] Signed-off-by: Adrian Hunter Link: http://lkml.kernel.org/r/1475847747-30994-3-git-send-email-adrian.hunter@intel.com Signed-off-by: Andi Kleen Signed-off-by: Arnaldo Carvalho de Melo

perf intel-pt/bts: Tidy instruction buffer size usage

2016-10-24T13:31:32Z

Tidy instruction buffer size usage in preparation for copying the instruction bytes onto samples. The instruction buffer is presently used for debugging, so rename its size macro from INTEL_PT_INSN_DBG_BUF_SZ to INTEL_PT_INSN_BUF_SZ, and use it everywhere. Note that the maximum instruction size is 15 which is a less efficient size to copy than 16, which is why a separate buffer size is used. Signed-off-by: Adrian Hunter Cc: Andi Kleen Link: http://lkml.kernel.org/r/1475847747-30994-2-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Fix build on powerpc broken by pt/bts

2015-08-31T18:47:33Z

It is theoretically possible to process perf.data files created on x86 and that contain Intel PT or Intel BTS data, on any other architecture, which is why it is possible for there to be build errors on powerpc caused by pt/bts. The errors were: util/intel-pt-decoder/intel-pt-insn-decoder.c: In function ‘intel_pt_insn_decoder’: util/intel-pt-decoder/intel-pt-insn-decoder.c:138:3: error: switch missing default case [-Werror=switch-default] switch (insn->immediate.nbytes) { ^ cc1: all warnings being treated as errors linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_synth_branch_sample': sources/linux-acme.git/tools/perf/util/intel-pt.c:871: undefined reference to `tsc_to_perf_time' linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_sample': sources/linux-acme.git/tools/perf/util/intel-pt.c:915: undefined reference to `tsc_to_perf_time' sources/linux-acme.git/tools/perf/util/intel-pt.c:962: undefined reference to `tsc_to_perf_time' linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_process_event': sources/linux-acme.git/tools/perf/util/intel-pt.c:1454: undefined reference to `perf_time_to_tsc' Signed-off-by: Adrian Hunter Cc: Jiri Olsa Cc: Sukadev Bhattiprolu Cc: Wang Nan Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1441046384-28663-1-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Fix tarball build broken by pt/bts

2015-08-22T15:27:07Z

Fix some include paths and add missing inat_types.h. Reported-by: Arnaldo Carvalho de Melo Signed-off-by: Adrian Hunter Cc: Jiri Olsa Link: http://lkml.kernel.org/r/55D77696.60102@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add Intel PT instruction decoder

2015-08-17T14:11:36Z

Add support for decoding instructions for Intel Processor Trace. The kernel x86 instruction decoder is copied for this. This essentially provides intel_pt_get_insn() which takes a binary buffer, uses the kernel's x86 instruction decoder to get details of the instruction and then categorizes it for consumption by an Intel PT decoder. Signed-off-by: Adrian Hunter Cc: Jiri Olsa Link: http://lkml.kernel.org/r/1439450095-30122-1-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo