linux-kernel - Re: [PATCH v2 1/2] tools lib traceevent: Export dynamic symbols used by traceevent plugins

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Message-ID: <20150513145049.GF25652@krava.redhat.com>
Date:	Wed, 13 May 2015 16:50:50 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	hekuang <hekuang@...o.com>
Cc:	He Kuang <hekuang@...wei.com>, acme@...nel.org, jolsa@...nel.org,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] tools lib traceevent: Export dynamic symbols used
 by traceevent plugins

On Tue, May 12, 2015 at 11:25:45PM +0800, hekuang wrote:
> Hi, jirka
> 
> On 05/12/2015 08:37 PM, Jiri Olsa wrote:
> >On Tue, May 12, 2015 at 06:41:56AM +0000, He Kuang wrote:
> >
> >SNIP
> >
> >>  	$(Q)$(MAKE) $(build)=perf
> >>-$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN)
> >>-	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(PERF_IN) $(LIBS) -o $@
> >>+LD_LIBTRACEEVENT_FLAGS += -Xlinker --dynamic-list=$(LIBTRACEEVENT_DYNAMIC_LIST)
> >>+$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN) $(LIBTRACEEVENT_DYNAMIC_LIST)
> >>+	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(LD_LIBTRACEEVENT_FLAGS) $(PERF_IN) $(LIBS) -o $@
> >>  $(GTK_IN): FORCE
> >>  	$(Q)$(MAKE) $(build)=gtk
> >>@@ -373,7 +375,13 @@ $(LIB_FILE): $(LIBPERF_IN)
> >>  LIBTRACEEVENT_FLAGS += plugin_dir=$(plugindir_SQ)
> >>  $(LIBTRACEEVENT): FORCE
> >>-	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) $(OUTPUT)libtraceevent.a plugins
> >>+	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) $(OUTPUT)libtraceevent.a
> >>+
> >>+libtraceevent_plugins: FORCE
> >>+	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) plugins
> >>+
> >>+$(LIBTRACEEVENT_DYNAMIC_LIST): libtraceevent_plugins
> >>+	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) $(OUTPUT)libtraceevent-dynamic-list
> >I thought the idea of v2 was not to introduce new target,
> >something like in attached patch (not completely tested)
> >
> >jirka
> 
> There is a problem, the target perf executable is dependent on
> the dynamic-list-file, so we should add plugins or the
> dynamic-list-file to perf's dependencies.
> 
> As your patch below, the dynamic-list-file is built implictly
> when building plugins, so we should not add it directly to the
> dependency list of perf.
> 
> It seems new targets are needed. In the v2 patch,

hum, I dont get it.. why ?

dynamic-list-file gets rebuilt any time plugins are rebuilt..
why not keep just the 'plugins' dependency?

jirka
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