[PATCH v1 0/2] perf annotate: add max/min cycles

[Jin Yao]

Currently perf has a feature to account cycles for LBRs

For example, on skylake,

perf record -b ...
perf report or
perf annotate

And then browsing the annotate browser gives average cycle counts
for program blocks.

For some analysis it would be useful if we could know not only
the average cycles but also the max and min cycles.

Now, for example, when press 'c', the annotate view is:

Percentâ IPC     Cycle(max/min)
       â
       â
       â                             Disassembly of section .text:
       â
       â                             000000000003aab0 <random@@GLIBC_2.2.5>:
  8.22 â3.92                           sub    $0x18,%rsp
       â3.92                           mov    $0x1,%esi
       â3.92                           xor    %eax,%eax
       â3.92                           cmpl   $0x0,argp_program_version_hook@@G
       â3.92             1(2/1)      â je     20
       â                               lock   cmpxchg %esi,__abort_msg@@GLIBC_P
       â                             â jne    29
       â                             â jmp    43
       â1.10                     20:   cmpxchg %esi,__abort_msg@@GLIBC_PRIVATE+
  8.93 â1.10             1(5/1)      â je     43

When press 'c' again, the annotate view is switched back:

Percentâ IPC Cycle
       â
       â
       â                Disassembly of section .text:
       â
       â                000000000003aab0 <random@@GLIBC_2.2.5>:
  8.22 â3.92              sub    $0x18,%rsp
       â3.92              mov    $0x1,%esi
       â3.92              xor    %eax,%eax
       â3.92              cmpl   $0x0,argp_program_version_hook@@GLIBC_2.2.5+0x
       â3.92     1      â je     20
       â                  lock   cmpxchg %esi,__abort_msg@@GLIBC_PRIVATE+0x8a0
       â                â jne    29
       â                â jmp    43
       â1.10        20:   cmpxchg %esi,__abort_msg@@GLIBC_PRIVATE+0x8a0
  8.93 â1.10     1      â je     43

Jin Yao (2):
  perf annotate: Record the max/min cycles
  perf annotate: Create hotkey 'c' to show max/min cycles

 tools/perf/ui/browsers/annotate.c |  8 ++++++
 tools/perf/util/annotate.c        | 51 +++++++++++++++++++++++++++++++++------
 tools/perf/util/annotate.h        | 11 ++++++++-
 3 files changed, 62 insertions(+), 8 deletions(-)

-- 
2.7.4