linux-kernel - Re: [PATCH 07/19] perf script: Set up output options for in-stream attributes

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Date:	Fri, 18 Oct 2013 11:32:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 07/19] perf script: Set up output options for in-stream
 attributes

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...

Please consider testing before/after that specific stack move:

commit f36f83f947ede547833e462696893f866df77324
Author: Namhyung Kim <namhyung.kim@....com>
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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