Re: [PATCH 07/19] perf script: Set up output options for in-streamattributes

[Adrian Hunter]

On 18/10/13 17:32, Arnaldo Carvalho de Melo wrote:
> Em Fri, Oct 18, 2013 at 07:30:13AM -0600, David Ahern escreveu:
>> On 10/18/13 6:29 AM, Adrian Hunter wrote:
> 
>>> Attributes (struct perf_event_attr) are recorded separately in the perf.data
>>> file.  perf script uses them to set up output options.  However attributes
>>> can also be in the event stream, for example when the input is a pipe (i.e.
>>> live mode).  This patch makes perf script process in-stream attributes in
>>> the same way as on-file attributes.
>  
>> You have multiple changes in this patch -- expanding attribute
>> processing to set output options per the description above and you
>> are also making perf_script a stack variable. The latter should be a
>> separate patch.
> 
> Agreed, and this conversion of struct perf_script to be a stack variable is
> nice (killing globals, a favourite pastime, yeah!), I like it, but in the past
> one such conversion showed something nasty that made several people stare at
> the build seeing builtin-sched.o take ages to build...

Fixed in V2

> 
> Please consider testing before/after that specific stack move:
> 
> commit f36f83f947ede547833e462696893f866df77324
> Author: Namhyung Kim <namhyung.kim@xxxxxxx>
> Date:   Tue Jun 4 14:46:19 2013 +0900
> 
>     perf sched: Move struct perf_sched definition out of cmd_sched()
>     
>     For some reason it consumed quite amount of compile time when declared
>     as local variable, and it disappeared when moved out of the function.
>     Moving other variables/tables didn't help.
>     
>     On my system this single-file-change build time reduced from 11s to 3s.
> 
> 

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