Re: perf top -z not working?

[Chulmin Kim <cmkim@core.kaist.ac.kr>]

2012-10-22 오후 11:10, Ryan Johnson 쓴 글:
> On 22/10/2012 9:12 AM, David Ahern wrote:
>> On 10/22/12 5:50 AM, Ryan Johnson wrote:
>>>>>> It seems that `perf top -z' does not behave as advertized, at
>>>>>> least not on the 3.2.0-25 kernel (Ubuntu) that I'm running. The
>>>>>> man page states that it should "zero history across display
>>>>>> updates" but the counts still seem to accumulate (the total
>>>>>> samples reported rises monotonically) and processes still show up
>>>>>> in the display long after they have exited. Pressing `z' or `Z'
>>>>>> seems to have no effect, either.
>>>> Are you using the --tui or --stdio interface? Try with both and 
>>>> check if
>>>> it works in one of them, I bet the problem is with --tui.
>>> --stdio does the same, so I'll have to try updating my kernel like
>>> Chulmin suggested (haven't had time to do that yet)
>>
>> The kernel has nothing to do with the feature. From builtin-top.c, 
>> this part is either not happening or more likely not happening 
>> correctly.
>>
>>     if (top->zero)
>>         symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
>>     else
>>         symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
>>
>> I recall it working recently - last year or so. Can you try different 
>> versions -- say 3.0, 3.2, 3.4 and latest? If you have a copy of 
>> Linus' tree or Arnaldo's git tree it should not take much time.
> Chulmin says his 3.0 version works. My 3.2.18 doesn't. I don't have a 
> copy of the git tree on that machine, but I'll try building 3.4.x and 
> tip when I get a chance. I have never built perf-tools before, though, 
> so I'd appreciate tips on what might be different for building 
> perf-tools compared to the kernel, and how to avoid building the 
> standard kernel along the way. Hopefully it's just 
> configure-make-install?
>

How about checking your "top" version first?

According to David's suggestion, it is the matter of top version.

Mine was 3.2.8. (top --version).




> Regards,
> Ryan
>