kernel/tools/perf/util/annotate.c, branch linux-4.16.y

perf report: Fix a wrong offset issue when using /proc/kcore

2018-01-08T14:11:57Z

When a valid vmlinux is not found, 'perf report' falls back to look at /proc/kcore. In this case, it will report the impossible large offset. For example: # perf record -b -e cycles:k find /etc/ > /dev/null # perf report --stdio --branch-history 22.77% _vm_normal_page+18446603336221188162 | ---page_remove_rmap +18446603336221188324 page_remove_rmap +18446603336221188487 (cycles:5) unlock_page_memcg +18446603336221188096 page_remove_rmap +18446603336221188327 (cycles:1) The issue is the value which is passed to parameter 'addr' in __get_srcline() is the objdump address. It's not correct if we calculate the offset by using 'addr - sym->start'. This patch creates a new parameter 'ip' in __get_srcline(). It is not converted to objdump address. With this patch, the perf report output is: 22.77% _vm_normal_page+66 | ---page_remove_rmap +228 page_remove_rmap +391 (cycles:5) unlock_page_memcg +0 page_remove_rmap +231 (cycles:1) page_remove_rmap +236 Committer testing: Make sure you get any valid vmlinux out of the way, using '-v' on the 'perf report' case and deleting it from places where perf searches them, like your kernel build dir and the build-id cache, in ~/.debug/. Reported-by: Arnaldo Carvalho de Melo Signed-off-by: Jin Yao Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Andi Kleen Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1514564812-17344-1-git-send-email-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf env: Adopt perf_env__arch() from the annotate code

2017-12-27T15:15:52Z

And use it in the libunwind case, with both passing a valid perf_env to extract the arch to be normalized from and passing NULL with the same semantic as in the annotate code: to get it from uname() uts.machine. Now the code to generate per arch errno translation tables (int/string) can use it to decode perf.data files recorded in a different arch than that where 'perf trace' (or any other analysis tool) runs. Cc: Adrian Hunter Cc: David Ahern Cc: Hendrik Brueckner Cc: Jiri Olsa Cc: Michael Petlan Cc: Namhyung Kim Cc: Thomas Richter Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-p2epffgash69w38kvj3ntpc9@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Use perf_env when obtaining the arch name

2017-12-27T15:15:51Z

Paving the way to reuse these routines in other areas, like when generating errno tables. Cc: Adrian Hunter Cc: David Ahern Cc: Hendrik Brueckner Cc: Jiri Olsa Cc: Michael Petlan Cc: Namhyung Kim Cc: Thomas Richter Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-rh1qv051vb8gfdcswskrn53h@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Get the cpuid from evsel->evlist->env in symbol__annotate()

2017-12-27T15:15:51Z

To reduce its function signature, since we get this from 'evsel' which is already one of its arguments. Cc: Adrian Hunter Cc: David Ahern Cc: Hendrik Brueckner Cc: Jiri Olsa Cc: Michael Petlan Cc: Namhyung Kim Cc: Thomas Richter Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-070eap7t6uicg9c3w086xy2z@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Fix objdump comment parsing for Intel mov dissassembly

2017-12-05T13:24:30Z

The command 'perf annotate' parses the output of objdump and also investigates the comments produced by objdump. For example the output of objdump produces (on x86): 23eee: 4c 8b 3d 13 01 21 00 mov 0x210113(%rip),%r15 # 234008 and the function mov__parse() is called to investigate the complete line. Mov__parse() breaks this line into several parts and finally calls function comment__symbol() to parse the data after the comment character '#'. Comment__symbol() expects a hexadecimal address followed by a symbol in '<' and '>' brackets. However the 2nd parameter given to function comment__symbol() always points to the comment character '#'. The address parsing always returns 0 because the character '#' is not a digit and strtoull() fails without being noticed. Fix this by advancing the second parameter to function comment__symbol() by one byte before invocation and add an error check after strtoull() has been called. Signed-off-by: Thomas Richter Reviewed-by: Hendrik Brueckner Acked-by: Ravi Bangoria Cc: Heiko Carstens Cc: Martin Schwidefsky Fixes: 6de783b6f50f ("perf annotate: Resolve symbols using objdump comment") Link: http://lkml.kernel.org/r/20171128075632.72182-1-tmricht@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Move symbol__calc_percent() call to outside symbol__disassemble()

2017-11-17T15:16:26Z

We need to call symbol__calc_percent() periodicaly for top, so it's no longer convenient to keep it in symbol__disassemble(). Let's separate the symbol__disassemble() to allocate and init the symbol annotation structs and symbol__calc_percent() to compute the lines percentages based on symbol hists data. Signed-off-by: Jiri Olsa Cc: Adrian Hunter Cc: David Ahern Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-gtnp8t4tb00q6lag07psn5nq@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Change (symbol|annotation)__calc_percent return type to void

2017-11-17T15:16:25Z

There's no need for symbol__calc_percent and annotation__calc_percent functions to return any value, since it's always zero. Changing both function to return void. Signed-off-by: Jiri Olsa Cc: Adrian Hunter Cc: David Ahern Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-z0gs28hh24m4gia1t1ctraye@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Do not truncate instruction names at 6 chars

2017-11-16T17:50:00Z

There are many instructions, esp on PowerPC, whose mnemonics are longer than 6 characters. Using precision limit causes truncation of such mnemonics. Fix this by removing precision limit. Note that, 'width' is still 6, so alignment won't get affected for length <= 6. Before: li r11,-1 xscvdp vs1,vs1 add. r10,r10,r11 After: li r11,-1 xscvdpsxds vs1,vs1 add. r10,r10,r11 Reported-by: Donald Stence Signed-off-by: Ravi Bangoria Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Taeung Song Link: http://lkml.kernel.org/r/20171114032540.4564-1-ravi.bangoria@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Align source and offset lines

2017-11-16T17:49:50Z

Align source with offset lines, which are more advanced, because of the address column. Before: : static void *worker_thread(void *__tdata) : { 0.00 : 48a971: push %rbp 0.00 : 48a972: mov %rsp,%rbp 0.00 : 48a975: sub $0x30,%rsp 0.00 : 48a979: mov %rdi,-0x28(%rbp) 0.00 : 48a97d: mov %fs:0x28,%rax 0.00 : 48a986: mov %rax,-0x8(%rbp) 0.00 : 48a98a: xor %eax,%eax : struct thread_data *td = __tdata; 0.00 : 48a98c: mov -0x28(%rbp),%rax 0.00 : 48a990: mov %rax,-0x10(%rbp) : int m = 0, i; 0.00 : 48a994: movl $0x0,-0x1c(%rbp) : int ret; : : for (i = 0; i < loops; i++) { 0.00 : 48a99b: movl $0x0,-0x18(%rbp) After: : static void *worker_thread(void *__tdata) : { 0.00 : 48a971: push %rbp 0.00 : 48a972: mov %rsp,%rbp 0.00 : 48a975: sub $0x30,%rsp 0.00 : 48a979: mov %rdi,-0x28(%rbp) 0.00 : 48a97d: mov %fs:0x28,%rax 0.00 : 48a986: mov %rax,-0x8(%rbp) 0.00 : 48a98a: xor %eax,%eax : struct thread_data *td = __tdata; 0.00 : 48a98c: mov -0x28(%rbp),%rax 0.00 : 48a990: mov %rax,-0x10(%rbp) : int m = 0, i; 0.00 : 48a994: movl $0x0,-0x1c(%rbp) : int ret; : : for (i = 0; i < loops; i++) { 0.00 : 48a99b: movl $0x0,-0x18(%rbp) It makes bigger different when displaying script sources, where the comment lines looks oddly shifted from the lines which actually hold code. I'll send script support separately. Committer note: Do not use a fixed column width for the addresses, as kernel ones se more than 10 columns, look at the last offset and get the right width. Signed-off-by: Jiri Olsa Cc: Andi Kleen Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20171011150158.11895-36-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Factor annotation_line__print from disasm_line__print

2017-11-16T17:49:44Z

Move generic annotation line display code into annotation_line__print function. Signed-off-by: Jiri Olsa Cc: Andi Kleen Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20171011150158.11895-25-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo