linux-kernel - Re: uprobe support mix of ftrace and perf

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Message-Id: <20181126171634.a68dbf9d7ce40e8c982ffec6@kernel.org>
Date:   Mon, 26 Nov 2018 17:16:34 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: uprobe support mix of ftrace and perf

Hi Oleg,

On Thu, 22 Nov 2018 15:32:10 +0100
Oleg Nesterov <oleg@...hat.com> wrote:

> Hi Masami,
> 
> On 11/20, Masami Hiramatsu wrote:
> >
> > Hello Oleg,
> >
> > I have a question about the (revert) commit 48212542067a
> > ("tracing/uprobes: Revert "Support mix of ftrace and perf""). I found
> > this limitation still exists on uprobe events.
> 
> Yes...
> 
> > Would you have any plan or idea to fix this issue? I thought this revert
> > patch was a tentative one, and should be fixed afterwards.
> 
> To be honest, I was going to fix this "soon" many years ago, but today I simply
> can't recall how this code actually works and what exactly we need to do to
> support ftrace/perf at the same time...
> 
> I'll try to read this code later, but I can't promise anything :/

I understand, it may take a while... no need to promise :). I'll also look
into it.

Thank you,

> 
> Oleg.
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>