Re: [PATCH v21 00/20] perf, tools: Add support for PMU events in JSON format

From: Jiri Olsa
Date: Thu Sep 22 2016 - 12:27:21 EST


On Thu, Sep 22, 2016 at 05:00:22PM +0200, Jiri Olsa wrote:
> On Mon, Sep 19, 2016 at 09:28:20PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Sep 19, 2016 at 09:02:58PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Mon, Sep 19, 2016 at 08:37:53PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > yeah, changing that typedef + true def to plain include <stdbool.h>
> > > > makes it progress to the next failure, which is in cross compilation
> > > > environments, such as using fedora 24 + the Android NDK to try to build
> > > > a ARM android binary.
> >
> > > 14 fedora:24-x-ARC-uClibc: FAIL
> > > GEN /tmp/build/perf/pmu-events/pmu-events.c
> > > /bin/sh: /tmp/build/perf/pmu-events/jevents: cannot execute binary file: Exec format error
> > > pmu-events/Build:11: recipe for target '/tmp/build/perf/pmu-events/pmu-events.c' failed
> > > make[2]: *** [/tmp/build/perf/pmu-events/pmu-events.c] Error 126
> > > Makefile.perf:461: recipe for target '/tmp/build/perf/pmu-events/pmu-events-in.o' failed
> > > make[1]: *** [/tmp/build/perf/pmu-events/pmu-events-in.o] Error 2
> > > make[1]: *** Waiting for unfinished jobs....
> >
> > Jiri, we need something similar to scripts/Makefile.host :-\
> >
> > Calling it a day, perhaps, for now, we should just detect that it is a
> > corss compile env (CROSS_COMPILE is set) and exclude all this code from
> > the build, emitting a warning.
> >
> > I left what I did at the tmp.perf/core branch of my repo at
> > git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git.
>
> as discussed on irc we will disable it for cross builds now,
> because we dont have good solution at the moment.. it's
> similar case as for fixdep tool:
>
> 3a70fcd3a4db tools build: Fix cross compile build
> ...
> We need to add support for host side tools build, meanwhile
> disabling fixdep usage for cross arch builds.
>
> I'll make a change to disable this for crossbuild and
> work on common solution later

could you please give it a try with patch below?
I tested but not with properly cross building...

also, did you want some message during the cross build that pmu-events are not included?

thanks,
jirka


---
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 24803c58049a..ec3a59d9a56b 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -755,6 +755,10 @@ ifndef NO_AUXTRACE
endif
endif

+ifndef CROSS_COMPILE
+ CFLAGS += -DHAVE_PMU_EVENTS_SUPPORT
+endif
+
# Among the variables below, these:
# perfexecdir
# template_dir
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 0abebcba849f..85257c49d5ab 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -349,7 +349,14 @@ include $(srctree)/tools/build/Makefile.include

JEVENTS := $(OUTPUT)pmu-events/jevents
JEVENTS_IN := $(OUTPUT)pmu-events/jevents-in.o
+
+#
+# Disabling pmu-events for cross compile, as
+# we dont support host CC tools building yet.
+#
+ifndef CROSS_COMPILE
PMU_EVENTS_IN := $(OUTPUT)pmu-events/pmu-events-in.o
+endif

export JEVENTS

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index ac097fcaba7b..21a3f21a6f6f 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -482,6 +482,8 @@ static struct cpu_map *pmu_cpumask(const char *name)
return cpus;
}

+#ifdef HAVE_PMU_EVENTS_SUPPORT
+
/*
* Return the CPU id as a raw string.
*
@@ -545,6 +547,13 @@ out:
return 0;
}

+#else
+static int pmu_add_cpu_aliases(struct list_head *head __maybe_unused)
+{
+ return 0;
+}
+#endif /* HAVE_PMU_EVENTS_SUPPORT */
+
struct perf_event_attr * __weak
perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
{