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Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker.

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker.
Date 2017-02-10 12:40 +0100
Message-ID <t9hIt-2Oi-9@gated-at.bofh.it> (permalink)
References <t9gCK-2aq-23@gated-at.bofh.it> <t9gjo-23D-17@gated-at.bofh.it> <t9gCK-2aq-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri, 10 Feb 2017, Dmitry Vyukov wrote:
> This is the right thing to do per se, but I am concerned that now
> people will just suffers from slow boot (it can take literally
> minutes) and will not realize the root cause nor that it's fixable
> (e.g. with rodata=n) and will probably just blame KASAN for slowness.
> 
> Could we default this rodata check to n under KASAN? Or at least print
> some explanatory warning message before doing marking rodata (it
> should be printed right before "hang", so if you stare at it for a
> minute during each boot you realize that it may be related)? Or
> something along these lines. FWIW in my builds I just always disable
> the check.

That certainly makes sense and we emit such warnings in other places
already (lockdep, trace_printk ...)

Thanks,

	tglx

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Thread

Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Dmitry Vyukov <dvyukov@google.com> - 2017-02-10 11:30 +0100
  Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Thomas Gleixner <tglx@linutronix.de> - 2017-02-10 12:40 +0100
    Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Dmitry Vyukov <dvyukov@google.com> - 2017-02-10 14:30 +0100
      Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Dmitry Vyukov <dvyukov@google.com> - 2017-02-10 15:20 +0100
      Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Mark Rutland <mark.rutland@arm.com> - 2017-02-10 15:40 +0100
        Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Mark Rutland <mark.rutland@arm.com> - 2017-02-10 15:50 +0100
      Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker. Mark Rutland <mark.rutland@arm.com> - 2017-02-10 16:00 +0100

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