Re: [PATCH v4 1/2] arm64: Introduce IRQ stack

From	Pratyush Anand <panand@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 1/2] arm64: Introduce IRQ stack
Date	2015-10-08 19:00 +0200
Message-ID	<qhmHV-UH-29@gated-at.bofh.it> (permalink)
References	<qgYPf-kO-17@gated-at.bofh.it> <qgYPg-kO-23@gated-at.bofh.it> <qhgCv-FB-33@gated-at.bofh.it> <qhkwp-6iy-9@gated-at.bofh.it>
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Hi Jungseok,

On 08/10/2015:11:32:43 PM, Jungseok Lee wrote:
> On Oct 8, 2015, at 7:25 PM, Pratyush Anand wrote:
> > Hi Jungseok,
> 
> Hi Pratyush,
> 
> > 
> > On 07/10/2015:03:28:11 PM, Jungseok Lee wrote:
> >> Currently, kernel context and interrupts are handled using a single
> >> kernel stack navigated by sp_el1. This forces a system to use 16KB
> >> stack, not 8KB one. This restriction makes low memory platforms suffer
> >> from memory pressure accompanied by performance degradation.
> > 
> > How will it behave on 64K Page system? There, it would take atleast 64K per cpu,
> > right?
> 
> It would take 16KB per cpu even on 64KB page system.
> The following code snippet from kernel/fork.c would be helpful.

Yes..Yes..its understood.
Thanks for pointing to the code.

~Pratyush
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[PATCH v4 0/2] arm64: Introduce IRQ stack  Jungseok Lee <jungseoklee85@gmail.com> - 2015-10-07 17:30 +0200
  [PATCH v4 1/2] arm64: Introduce IRQ stack Jungseok Lee <jungseoklee85@gmail.com> - 2015-10-07 17:30 +0200
    Re: [PATCH v4 1/2] arm64: Introduce IRQ stack Pratyush Anand <panand@redhat.com> - 2015-10-08 12:30 +0200
      Re: [PATCH v4 1/2] arm64: Introduce IRQ stack Jungseok Lee <jungseoklee85@gmail.com> - 2015-10-08 16:40 +0200
        Re: [PATCH v4 1/2] arm64: Introduce IRQ stack Pratyush Anand <panand@redhat.com> - 2015-10-08 19:00 +0200

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