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Subject: Re: [PATCH] dcookies: Make dcookies depend on CONFIG_OPROFILE
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@infradead.org>
Cc:     Viresh Kumar <viresh.kumar@linaro.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        anmar.oueja@linaro.org, Arnd Bergmann <arnd@arndb.de>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <51a9a594a38ae6e0982e78976cf046fb55b63a8e.1603191669.git.viresh.kumar@linaro.org>
 <20201027085152.GB10053@infradead.org>
 <CAHk-=whw9t3ZtV8iA2SJWYQS1VOJuS14P_qhj3v5-9PCBmGQww@mail.gmail.com>
From:   William Cohen <wcohen@redhat.com>
Message-ID: <b3a8e2e8-350f-65af-9707-a6d847352f8e@redhat.com>
Date:   Wed, 28 Oct 2020 12:34:26 -0400
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On 10/27/20 12:54 PM, Linus Torvalds wrote:
> On Tue, Oct 27, 2020 at 1:52 AM Christoph Hellwig <hch@infradead.org> wrote:
>>
>> Is it time to deprecate and eventually remove oprofile while we're at
>> it?
> 
> I think it's well past time.
> 
> I think the user-space "oprofile" program doesn't actually use the
> legacy kernel code any more, and hasn't for a long time.
> 
> But I might be wrong. Adding William Cohen to the cc, since he seems
> to still maintain it to make sure it builds etc.
> 
>              Linus
> 

Hi,

Yes, current OProfile code uses the existing linux perf infrastructure and doesn't use the old oprofile kernel code.  I have thought about removing that old oprofile driver code from kernel, but have not submitted patches for it. I would be fine with eliminating that code from the kernel.

-Will