linux-kernel - Re: [PATCH v3 6/9] trace_uprobe: Support SDT markers having reference count (semaphore)

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Message-Id: <1525772725.o3tzigt8c3.naveen@linux.ibm.com>
Date:   Tue, 08 May 2018 15:16:43 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     acme@...nel.org, akpm@...ux-foundation.org,
        alexander.shishkin@...ux.intel.com, alexis.berlemont@...il.com,
        ananth@...ux.vnet.ibm.com, corbet@....net,
        dan.j.williams@...el.com, fengguang.wu@...el.com,
        jglisse@...hat.com, jolsa@...hat.com, kan.liang@...el.com,
        kjlx@...pleofstupid.com, kstewart@...uxfoundation.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, milian.wolff@...b.com, mingo@...hat.com,
        namhyung@...nel.org, oleg@...hat.com, pc@...ibm.com,
        peterz@...radead.org, rostedt@...dmis.org,
        srikar@...ux.vnet.ibm.com, tglx@...utronix.de,
        yao.jin@...ux.intel.com
Subject: Re: [PATCH v3 6/9] trace_uprobe: Support SDT markers having reference
 count (semaphore)

Masami Hiramatsu wrote:
> On Mon, 7 May 2018 13:51:21 +0530
> Ravi Bangoria <ravi.bangoria@...ux.ibm.com> wrote:
> 
>> BTW, same issue exists for normal uprobe. If uprobe_mmap() fails,
>> there is no feedback to trace_uprobe and no warnigns in dmesg as
>> well !! There was a patch by Naveen to warn such failures in dmesg
>> but that didn't go in: https://lkml.org/lkml/2017/9/22/155
> 
> Oops, that's a real bug. It seems the ball is in Naveen's hand.
> Naveen, could you update it according to Oleg's comment, and resend it?

Yes, I've had to put that series on the backburner. I will try and get 
to it soon. Thanks for the reminder.

- Naveen