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Message-ID: <55549B6F.3030701@huawei.com>
Date: Thu, 14 May 2015 20:56:15 +0800
From: He Kuang <hekuang@...wei.com>
To: Jiri Olsa <jolsa@...hat.com>, hekuang <hekuang@...o.com>
CC: <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
Hi, jirka
On 2015/5/13 22:50, Jiri Olsa wrote:
> 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?
You can test your patch as following steps:
$ touch ../lib/traceevent/plugin_function.c
$ make
CC plugin_function.o
LD plugin_function-in.o
LINK plugin_function.so
GEN libtraceevent-dynamic-list
perf is not rebuilt. There should be a 'GEN perf', right?
>
> jirka
>
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