linux-stable.git/tools/perf/builtin-annotate.c, branch linux-5.7.y

perf annotate: Prefer cmdline option over default config

2020-02-27T13:45:08+00:00

For all the perf-config options that can also be set from command line
option, the preference is given to command line version in case of any
conflict. But that's opposite in case of perf annotate. i.e. the more
preference is given to default option rather than command line option.
Fix it.

Before:

  $ ./perf config
  annotate.show_nr_samples=false

  $ ./perf annotate shash --show-nr-samples
  Percent│
         │24:   mov    -0xc(%rbp),%eax
   49.19 │      imul   $0x1003f,%eax,%ecx
         │      mov    -0x18(%rbp),%rax

After:

  Samples│
         │24:   mov    -0xc(%rbp),%eax
       1 │      imul   $0x1003f,%eax,%ecx
         │      mov    -0x18(%rbp),%rax

Signed-off-by: Ravi Bangoria 
Tested-by: Arnaldo Carvalho de Melo 
Cc: Adrian Hunter 
Cc: Alexey Budankov 
Cc: Changbin Du 
Cc: Ian Rogers 
Cc: Jin Yao 
Cc: Jiri Olsa 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Song Liu 
Cc: Taeung Song 
Cc: Thomas Richter 
Cc: Yisheng Xie 
Link: http://lore.kernel.org/lkml/20200213064306.160480-7-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Make perf config effective

2020-02-27T13:44:59+00:00

perf default config set by user in [annotate] section is totally ignored
by annotate code. Fix it.

Before:

  $ ./perf config
  annotate.hide_src_code=true
  annotate.show_nr_jumps=true
  annotate.show_nr_samples=true

  $ ./perf annotate shash
         │    unsigned h = 0;
         │      movl   $0x0,-0xc(%rbp)
         │    while (*s)
         │    ↓ jmp    44
         │    h = 65599 * h + *s++;
   11.33 │24:   mov    -0xc(%rbp),%eax
   43.50 │      imul   $0x1003f,%eax,%ecx
         │      mov    -0x18(%rbp),%rax

After:

         │        movl   $0x0,-0xc(%rbp)
         │      ↓ jmp    44
       1 │1 24:   mov    -0xc(%rbp),%eax
       4 │        imul   $0x1003f,%eax,%ecx
         │        mov    -0x18(%rbp),%rax

Note that we have removed show_nr_samples and show_total_period from
annotation_options because they are not used. Instead of them we use
symbol_conf.show_nr_samples and symbol_conf.show_total_period.

Committer testing:

Using 'perf annotate --stdio2' to use the TUI rendering but emitting the output to stdio:

  # perf config
  #
  # perf config annotate.hide_src_code=true
  # perf config
  annotate.hide_src_code=true
  #
  # perf config annotate.show_nr_jumps=true
  # perf config annotate.show_nr_samples=true
  # perf config
  annotate.hide_src_code=true
  annotate.show_nr_jumps=true
  annotate.show_nr_samples=true
  #
  #

Before:

  # perf annotate --stdio2 ObjectInstance::weak_pointer_was_finalized
  Samples: 1  of event 'cycles', 4000 Hz, Event count (approx.): 830873, [percent: local period]
  ObjectInstance::weak_pointer_was_finalized() /usr/lib64/libgjs.so.0.0.0
  Percent
              00000000000609f0 :
                endbr64
                cmpq    $0x0,0x20(%rdi)
              ↓ je      10
                xor     %eax,%eax
              ← retq
                xchg    %ax,%ax
  100.00  10:   push    %rbp
                cmpq    $0x0,0x18(%rdi)
                mov     %rdi,%rbp
              ↓ jne     20
          1b:   xor     %eax,%eax
                pop     %rbp
              ← retq
                nop
          20:   lea     0x18(%rdi),%rdi
              → callq   JS_UpdateWeakPointerAfterGC(JS::Heap /dev/null
  Samples: 1  of event 'cycles', 4000 Hz, Event count (approx.): 830873, [percent: local period]
  ObjectInstance::weak_pointer_was_finalized() /usr/lib64/libgjs.so.0.0.0
  Samples       endbr64
                cmpq    $0x0,0x20(%rdi)
              ↓ je      10
                xor     %eax,%eax
              ← retq
                xchg    %ax,%ax
     1  1 10:   push    %rbp
                cmpq    $0x0,0x18(%rdi)
                mov     %rdi,%rbp
              ↓ jne     20
        1 1b:   xor     %eax,%eax
                pop     %rbp
              ← retq
                nop
        1 20:   lea     0x18(%rdi),%rdi
              → callq   JS_UpdateWeakPointerAfterGC(JS::Heap /dev/null
  Samples: 1  of event 'cycles', 4000 Hz, Event count (approx.): 830873, [percent: local period]
  ObjectInstance::weak_pointer_was_finalized() /usr/lib64/libgjs.so.0.0.0
  Samples       endbr64
                cmpq    $0x0,0x20(%rdi)
              ↓ je      10
                xor     %eax,%eax
              ← retq
                xchg    %ax,%ax
       1  10:   push    %rbp
                cmpq    $0x0,0x18(%rdi)
                mov     %rdi,%rbp
              ↓ jne     20
          1b:   xor     %eax,%eax
                pop     %rbp
              ← retq
                nop
          20:   lea     0x18(%rdi),%rdi
              → callq   JS_UpdateWeakPointerAfterGC(JS::Heap
Tested-by: Arnaldo Carvalho de Melo 
Cc: Adrian Hunter 
Cc: Alexey Budankov 
Cc: Changbin Du 
Cc: Ian Rogers 
Cc: Jin Yao 
Cc: Jiri Olsa 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Song Liu 
Cc: Taeung Song 
Cc: Thomas Richter 
Cc: Yisheng Xie 
Link: http://lore.kernel.org/lkml/20200213064306.160480-6-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Support --prefix/--prefix-strip

2020-01-14T15:02:19+00:00

The objdump utility has useful --prefix / --prefix-strip options to
allow changing source code file names hardcoded into executables' debug
info. Add options to 'perf report', 'perf top' and 'perf annotate',
which are then passed to objdump.

  $ mkdir foo
  $ echo 'main() { for (;;); }' > foo/foo.c
  $ gcc -g foo/foo.c
  foo/foo.c:1:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
      1 | main() { for (;;); }
        | ^~~~
  $ perf record ./a.out
  ^C[ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.230 MB perf.data (5721 samples) ]
  $ mv foo bar
  $ perf annotate
  
  $ perf annotate --prefix=/home/ak/lsrc/git/bar --prefix-strip=5
  

Signed-off-by: Andi Kleen 
Tested-by: Jiri Olsa 
LPU-Reference: 20200107210444.214071-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo

pref tools: Make 'struct addr_map_symbol' contain 'struct map_symbol'

2019-11-12T11:20:53+00:00

So that we pass that substructure around and with it consolidate lots of
functions that receive a (map, symbol) pair and now can receive just a
'struct map_symbol' pointer.

This further paves the way to add 'struct map_groups' to 'struct
map_symbol' so that we can have all we need for annotation so that we
can ditch 'struct map'->groups, i.e. have the map_groups pointer in a
more central place, avoiding the pointer in the 'struct map' that have
tons of instances.

Cc: Adrian Hunter 
Cc: Andi Kleen 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: https://lkml.kernel.org/n/tip-fs90ttd9q12l7989fo7pw81q@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Pass a 'map_symbol' in places receiving a pair of 'map' and 'symbol' pointers

2019-11-12T11:20:53+00:00

We are already passing things like:

  symbol__annotate(ms->sym, ms->map, ...)

So shorten the signature of such functions to receive the 'map_symbol'
pointer.

This also paves the way to having the 'struct map_groups' pointer in the
'struct map_symbol' so that we can get rid of 'struct map'->groups.

Cc: Adrian Hunter 
Cc: Andi Kleen 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: https://lkml.kernel.org/n/tip-23yx8v1t41nzpkpi7rdrozww@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf hist: Count the total cycles of all samples

2019-11-07T12:14:15+00:00

We can get the per sample cycles by hist__account_cycles(). It's also
useful to know the total cycles of all samples in order to get the
cycles coverage for a single program block in further. For example:

  coverage = per block sampled cycles / total sampled cycles

This patch creates a new argument 'total_cycles' in hist__account_cycles(),
which will be added with the cycles of each sample.

Signed-off-by: Jin Yao 
Reviewed-by: Jiri Olsa 
Cc: Alexander Shishkin 
Cc: Andi Kleen 
Cc: Jin Yao 
Cc: Kan Liang 
Cc: Peter Zijlstra 
Link: http://lore.kernel.org/lkml/20191107074719.26139-4-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo

perf session: Return error code for perf_session__new() function on failure

2019-09-20T18:58:11+00:00

This patch is to return error code of perf_new_session function on
failure instead of NULL.

Test Results:

Before Fix:

  $ perf c2c report -input
  failed to open nput: No such file or directory

  $ echo $?
  0
  $

After Fix:

  $ perf c2c report -input
  failed to open nput: No such file or directory

  $ echo $?
  254
  $

Committer notes:

Fix 'perf tests topology' case, where we use that TEST_ASSERT_VAL(...,
session), i.e. we need to pass zero in case of failure, which was the
case before when NULL was returned by perf_session__new() for failure,
but now we need to negate the result of IS_ERR(session) to respect that
TEST_ASSERT_VAL) expectation of zero meaning failure.

Reported-by: Nageswara R Sastry 
Signed-off-by: Mamatha Inamdar 
Tested-by: Arnaldo Carvalho de Melo 
Tested-by: Nageswara R Sastry 
Acked-by: Ravi Bangoria 
Reviewed-by: Jiri Olsa 
Reviewed-by: Mukesh Ojha 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Alexey Budankov 
Cc: Greg Kroah-Hartman 
Cc: Jeremie Galarneau 
Cc: Kate Stewart 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Shawn Landden 
Cc: Song Liu 
Cc: Thomas Gleixner 
Cc: Tzvetomir Stoyanov 
Link: http://lore.kernel.org/lkml/20190822071223.17892.45782.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Add missing machine.h include directive

2019-09-20T12:19:22+00:00

We use what is defined there, were getting it by luck, indirectly, fix
it.

Cc: Adrian Hunter 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: https://lkml.kernel.org/n/tip-56g4jshmktniundmiw7h845k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Move mem_info and branch_info out of symbol.h

2019-09-01T01:27:48+00:00

The mem_info struct goes to mem-events.h and branch_info goes to
branch.h, where they belong, this way we can remove several headers from
symbols.h and trim the include dependency tree more.

Cc: Adrian Hunter 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: https://lkml.kernel.org/n/tip-aupw71xnravcsu2xoabfmhpc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Remove needless thread.h include directives

2019-09-01T01:24:10+00:00

Now that thread.h isn't included by any other header, we can check where
it is really needed, i.e. we can remove it and be sure that it isn't
being obtained indirectly.

Cc: Adrian Hunter 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: https://lkml.kernel.org/n/tip-kh333ivjbw05wsggckpziu86@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo