Re: [RFC/PATCH 1/2] perf top: Fix -z option behavior

[Namhyung Kim]

Hi David,

On Tue, 12 Aug 2014 13:01:41 -0600, David Ahern wrote:
> On 8/12/14, 2:16 AM, Namhyung Kim wrote:
>> The current -z option does almost nothing.  It doesn't zero the
>> existing samples so that we can see profiles of exited process after
>> last refresh.  It seems it only affects annotation.
>>
>> This patch clears existing entries before processing if -z option is
>> given.  For this original decaying logic also moved before processing.
>
> This option was broken somewhere recently. I am on vacation for
> another week, so I can't do a git bisect myself but I recall it worked
> a year or so ago. Try v3.4 as a start point.

Are you sure?  I don't recall seeing any big change in this area so I
guess the problem existed since long time ago.  In fact I couldn't find
a logic to zero/clear out existing hist entries in a hists..

Thanks,
Namhyung
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