linux-kernel - Re: [PATCH 05/37] perf tools: Create separate mmap for dummy tracking event

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Message-ID: <20141225220850.GB8719@krava>
Date:	Thu, 25 Dec 2014 23:08:50 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 05/37] perf tools: Create separate mmap for dummy
 tracking event

On Wed, Dec 24, 2014 at 04:15:01PM +0900, Namhyung Kim wrote:
> When multi file support is enabled, a dummy tracking event will be
> used to track metadata (like task, comm and mmap events) for a session
> and actual samples will be recorded in separate files.
> 
> Provide separate mmap to the dummy tracking event.  The size is fixed
> to 128KiB (+ 1 page) as the event rate will be lower than samples.  I
> originally wanted to use a single mmap for this but cross-cpu sharing
> is prohibited so it's per-cpu (or per-task) like normal mmaps.

maybe this needs to be applied after next patch?
  perf tools: Introduce perf_evlist__mmap_multi

I'm getting compile error:

[jolsa@...va perf]$ make JOBS=1
  BUILD:   Doing 'make -j1' parallel build
  CC       util/evlist.o
util/evlist.c: In function ‘perf_evlist__mmap_per_evsel’:
util/evlist.c:937:9: error: ‘struct mmap_params’ has no member named ‘track’
   if (mp->track && perf_evsel__is_dummy_tracking(evsel)) {
         ^
util/evlist.c: In function ‘perf_evlist__mmap’:
util/evlist.c:1092:62: error: ‘use_track_mmap’ undeclared (first use in this function)
  if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist, use_track_mmap) < 0)
                                                              ^
util/evlist.c:1092:62: note: each undeclared identifier is reported only once for each function it appears in
make[1]: *** [util/evlist.o] Error 1
make: *** [all] Error 2

jirka
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