linux-kernel - Re: [PATCH 2/9] perf/jit: enable jitdump support without dwarf

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Date:   Thu, 13 Oct 2016 15:51:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Maciej Debski <maciejd@...gle.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 2/9] perf/jit: enable jitdump support without dwarf

Em Thu, Oct 13, 2016 at 03:37:42PM -0300, Arnaldo Carvalho de Melo escreveu:
> I'm trying to figure this out...

So, building with:

make -C tools/perf LDFLAGS=-static O=/tmp/build/perf install-bin

I get:

[acme@...et linux]$ grep libelf /tmp/build/perf/FEATURE-DUMP 
feature-libelf=0
feature-libelf-getphdrnum=0
feature-libelf-gelf_getnote=0
feature-libelf-getshdrstrndx=0
feature-libelf-mmap=0
[acme@...et linux]$

And jitdump is only linked if:

[acme@...et linux]$ grep jitdump tools/perf/*/Build
tools/perf/util/Build:libperf-$(CONFIG_LIBELF) += jitdump.o
[acme@...et linux]$ 

But:

#ifdef HAVE_JITDUMP
static int perf_event__jit_repipe_mmap(struct perf_tool *tool,
.
.
.
        ret = jit_process(inject->session, &inject->output, machine,
                          event->mmap.filename, sample->pid, &n);
.
.
.
#endif

So we need:

[acme@...et linux]$ git diff
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 8cfc310d4358..cffdd9cf3ebf 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -366,8 +366,10 @@ ifndef NO_SDT
 endif
 
 ifdef PERF_HAVE_JITDUMP
+  ifndef NO_LIBELF
     $(call detected,CONFIG_JITDUMP)
     CFLAGS += -DHAVE_JITDUMP
+  endif
 endif
 
 ifeq ($(ARCH),powerpc)
[acme@...et linux]$ 

To get that fixed.

Please let me know if this suits your needs.

I'll now try building with elfutils static libraries to see if in that case it
all gets linked.

- Arnaldo