linux-kernel - Re: [REGRESSION] RLIMIT

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Message-ID: <CALYGNiNuF1Ggy=DyYG32HXbnJp3Q0cX9ekQ5w2jR1M9rkKaX9A@mail.gmail.com>
Date:   Sat, 17 Sep 2016 11:33:56 +0300
From:   Konstantin Khlebnikov <koct9i@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Sam Varshavchik <mrsam@...rier-mta.com>,
        Ingo Molnar <mingo@...nel.org>,
        Laura Abbott <labbott@...hat.com>, Brent <fix@...realm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] RLIMIT_DATA crashes named

On Sat, Sep 17, 2016 at 7:08 AM, Joe Perches <joe@...ches.com> wrote:
> On Fri, 2016-09-16 at 17:040700, Linus Torvalds wrote:
>> On Fri, Sep 16, 2016 at 4:58 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>> > Here's a totally untested patch. What do people say?
>> Heh. It looks like "pr_xyz_once()" is used in places that haven't
>> included "ratelimit.h", so this doesn't actually build for everything.
>> But I guess as a concept patch it's not hard to understand, even if
>> the implementation needs a bit of tweaking.
>
> do_just_once just isn't a good name for a global
> rate limited mechanism that does something very
> different than the name.
>
> Maybe allow_once_per_ratelimit or the like
>
> There could be an equivalent do_once
>
> https://lkml.org/lkml/2009/5/22/3
>

What about this printk_reriodic() and pr_warn_once_per_minute()?

It simply remembers next jiffies to print rather than using that
complicated ratelimiting engine.

Download attachment "printk-add-pr_warn_once_per_minute" of type "application/octet-stream" (2273 bytes)