linux-kernel - Re: change uprobe_events default ? Was: [PATCH] perf: Rename CONFIG_[UK]PROBE_EVENT to CONFIG_[UK]PROBE

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Message-ID: <5bdd6b73-136b-aafd-3ed3-2a1970310b63@huawei.com>
Date:   Thu, 16 Mar 2017 13:46:54 +0800
From:   "Wangnan (F)" <wangnan0@...wei.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:     Anton Blanchard <anton@...abs.org>,
        David Miller <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Hemant Kumar" <hemant@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <sparclinux@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: change uprobe_events default ? Was: [PATCH] perf: Rename
 CONFIG_[UK]PROBE_EVENT to CONFIG_[UK]PROBE_EVENTS



On 2017/3/16 9:06, Arnaldo Carvalho de Melo wrote:
> Added more people to the CC list.
>
> Em Wed, Mar 15, 2017 at 05:58:19PM -0700, Alexei Starovoitov escreveu:
>> On Thu, Feb 16, 2017 at 05:00:50PM +1100, Anton Blanchard wrote:
>>> We have uses of CONFIG_UPROBE_EVENT and CONFIG_KPROBE_EVENT as
>>> well as CONFIG_UPROBE_EVENTS and CONFIG_KPROBE_EVENTS. Consistently
>>> use the plurals.
>   
>> this rename made me notice that UPROBE_EVENTS still defaults to 'n'.
>> this is key feature that all distros enable, so having default 'n'
>> is kinda saying that it's not something that should be turned on
>> or used widely. which is obviously not the case.
>> imo it's time to change it to 'y'.
>> Thoughts?
> Agreed, I also found it strange that it was disabled by default when I
> recently did a 'make oldconfig' :-\
>
> - Arnaldo

+1.

Some internal distros in my company now have started
discussing supporting user space probing. Turning
uprobes on for upstream kernel helps us saving a lot
of discussion.

Thank you.