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Date: Mon, 4 May 2020 10:33:56 -0700
From: Sami Tolvanen <>
To: Will Deacon <>
Cc: Kees Cook <>,
	Catalin Marinas <>,
	James Morse <>,
	Steven Rostedt <>,
	Ard Biesheuvel <>,
	Mark Rutland <>,
	Masahiro Yamada <>,
	Michal Marek <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	Juri Lelli <>,
	Vincent Guittot <>,
	Dave Martin <>,
	Laura Abbott <>, Marc Zyngier <>,
	Masami Hiramatsu <>,
	Nick Desaulniers <>,
	Jann Horn <>,
	Miguel Ojeda <>,,,,
Subject: Re: [PATCH v11 01/12] add support for Clang's Shadow Call Stack (SCS)

On Mon, May 04, 2020 at 05:52:28PM +0100, Will Deacon wrote:
> On Mon, Apr 27, 2020 at 01:45:46PM -0700, Sami Tolvanen wrote:
> > I agree that allocating from a kmem_cache isn't ideal for safety. It's a
> > compromise to reduce memory overhead.
> Do you think it would be a problem if we always allocated a page for the
> SCS?

Yes, the memory overhead was deemed too large for Android devices, which
have thousands of threads running.


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