linux-kernel - Re: [PATCH] dcookies: Make dcookies depend on CONFIG

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Message-ID: <b3a8e2e8-350f-65af-9707-a6d847352f8e@redhat.com>
Date:   Wed, 28 Oct 2020 12:34:26 -0400
From:   William Cohen <wcohen@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        anmar.oueja@...aro.org, Arnd Bergmann <arnd@...db.de>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dcookies: Make dcookies depend on CONFIG_OPROFILE

On 10/27/20 12:54 PM, Linus Torvalds wrote:
> On Tue, Oct 27, 2020 at 1:52 AM Christoph Hellwig <hch@...radead.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